Schizophrenia & Other Psychotic Disorders

CASE New-onset auditory hallucinations

Ms. L, age 78, presents to our hospital with worsening anxiety due to auditory hallucinations. She has been hearing music, which she reports is worse at night and consists of songs, usually the song Jingle Bells, sometimes just melodies and other times with lyrics. Ms. L denies paranoia, visual hallucinations, or worsening mood.

Two weeks ago, Ms. L had visited another hospital, describing 5 days of right-side hearing loss accompanied by pain and burning in her ear and face, along with vesicular lesions in a dermatomal pattern extending into her auditory canal. During this visit, Ms. L’s complete blood count, urine culture, urine drug screen, electrolytes, liver panel, thyroid studies, and vitamin levels were unremarkable. A CT scan of her head showed no abnormalities.

Ms. L was diagnosed with Ramsay Hunt syndrome (herpes zoster oticus), which affects cranial nerves, because of physical examination findings with a dermatomal pattern of lesion distribution and associated pain. Ramsay Hunt syndrome can cause facial paralysis and hearing loss in the affected ear. She was discharged with prescriptions for prednisone 60 mg/d for 7 days and valacyclovir 1 g/d for 7 days and told to follow up with her primary care physician. During the present visit to our hospital, Ms. L’s home health nurse reports that she still has her entire bottles of valacyclovir and prednisone left. Ms. L also has left-side hearing loss that began 5 years ago and a history of recurrent major depressive disorder (MDD) and generalized anxiety disorder. Due to the recent onset of right-side hearing loss, her hearing impairment requires her to communicate via writing or via a voice-to-text app.

HISTORY Depressed and living alone

Ms. L was diagnosed with MDD more than 4 decades ago and has been receiving medication since then. She reports no prior psychiatric hospitalizations, suicide attempts, manic symptoms, or psychotic symptoms. For more than 20 years, she has seen a nurse practitioner, who had prescribed mirtazapine 30 mg/d for MDD, poor appetite, and sleep. Within the last 5 years, her nurse practitioner added risperidone 0.5 mg/d at night to augment the mirtazapine for tearfulness, irritability, and mood swings.

Ms. L’s medical history also includes hypertension and chronic obstructive pulmonary disease. She is a retired teacher and lives alone. She has a chore worker who visits her home for 1 hour 5 days a week to help with cleaning and lifting, and support from her son. Ms. L no longer drives and relies on others for transportation, but is able to manage her finances, activities of daily living, cooking, and walking without any assistance.

[polldaddy:12807642]

EVALUATION Identifying the cause of the music

Ms. L is alert and oriented to time and situation, her concentration is appropriate, and her recent and remote memories are preserved. A full cognitive screen is not performed, but she is able to spell WORLD forwards and backwards and adequately perform a serial 7s test. An examination of her ear does not reveal any open vesicular lesions or swelling, but she continues to report pain and tingling in the C7 dermatomal pattern. Her urine drug screen and infectious and autoimmune laboratory testing are unremarkable. She does not have electrolyte, renal function, or blood count abnormalities. An MRI of her brain that is performed to rule out intracranial pathology due to acute hearing loss shows no acute intracranial abnormalities, with some artifact effect due to motion. Because temporal lobe epilepsy can present with hallucinations,¹ an EEG is performed to rule out seizure activity; it shows a normal wake pattern.

Psychiatry is consulted for management of the auditory hallucinations because Ms. L is distressed by hearing music. Ms. L is evaluated by Neurology and Otolaryngology. Neurology recommends a repeat brain MRI in the outpatient setting after seeing an artifact in the inpatient imaging, as well as follow-up with her primary care physician. Otolaryngology believes her symptoms are secondary to Ramsay Hunt syndrome with incomplete treatment, which is consistent with the initial diagnosis from her previous hospital visit, and recommends another course of oral corticosteroids, along with Audiology and Otolaryngology follow-up.

Continue to: The authors' observations

This is the first case we have seen detailing musical hallucinations (MH) secondary to Ramsay Hunt syndrome, although musical hallucinations have been associated with other etiologies of hearing loss. MH is a “release phenomenon” believed to be caused by deprivation of stimulation of the auditory cortex.² They are categorized as complex auditory hallucinations made up of melodies and rhythms and may be present in up to 2.5% of patients with hearing impairment.¹ The condition is mostly seen in older adults because this population is more likely to experience hearing loss. MH is more common among women (70% to 80% of cases) and is highly comorbid with psychiatric disorders such as schizophrenia, obsessive-compulsive disorder, or (as was the case for Ms. L) MDD.³ Hallucinations secondary to hearing loss may be more common in left-side hearing loss.⁴ In a 2005 study, Warner et al⁵ found religious music such as hymns or Christmas carols was most commonly heard, possibly due to repetitive past exposure.

There is no consensus on treatment for MH. Current treatment guidance comes from case reports and case series. Treatment is generally most successful when the etiology of the hallucination is both apparent and treatable, such as an infectious eitiology.³ In the case of MH due to hearing loss, hallucinations may improve following treatment with hearing aids or cochlear implants,^1,3,6,7 which is what was advised for Ms. L. Table 1^7-9 outlines other possible measures for addressing musical hallucinations.

CP02210041_t1.png

Anticholinesterases, antidepressants, and antiepileptics may provide some benefit.⁸ However, pharmacotherapy is generally less efficacious and can cause adverse effects, so environmental support and hearing aids may be a safer approach. No medications have been shown to completely cure MH.

TREATMENT Hearing loss management and follow-up

When speaking with the consulting psychiatry team, Ms. L reports her outpatient psychotropic regimen has been helpful. The team decides to continue mirtazapine 30 mg/d and risperidone 0.5 mg/d at night. We recommend that Ms. L discuss tapering off risperidone with her outpatient clinician if they feel it may be indicated to reduce the risk of adverse effects. The treatment team decides not to start corticosteroids due to the risk of steroid-induced psychotic symptoms. The team discusses hallucinations related to hearing loss with Ms. L and advise her to follow up with Audiology and Otolaryngology in the outpatient setting.

The authors’ observations

Approximately 40% of people age >60 struggle with hearing impairment^4,9; this impacts their general quality of life and how clinicians communicate with such patients.¹⁰ People with hearing loss are more likely to develop feelings of social isolation, depression, and delirium (Table 2^8,10,11).¹¹

CP02210041_t2.png

Risk factors for hearing loss include tobacco use, metabolic syndrome, exposure to loud noises, and exposure to certain ototoxic medications such as chemotherapeutic agents.¹¹ As psychiatrists, it is important to identify patients who may be at risk for hearing loss and refer them to the appropriate medical professional. If hearing loss is new onset, refer the patient to an otolaryngologist for a full evaluation. Unilateral hearing loss should warrant further workup because this could be due to an acoustic neuroma.¹¹

When providing care for a patient who uses a hearing aid, discuss adherence, barriers to adherence, and difficulties with adjusting the hearing aid. A referral to an audiologist may help patients address these barriers. Patients with hearing impairment or loss may benefit from auditory rehabilitation programs that provide communication strategies, ways to adapt to hearing loss, and information about different assistive options.¹¹ Such programs are often run by audiologists or speech language pathologists and contain both counseling and group components.

Continue to: Is is critical for psychiatrists...

It is critical for psychiatrists to ensure appropriate communication with patients who are hearing impaired (Table 3^8-11). The use of assistive devices such as sound amplifiers, written messages, or family members to assist in communication is needed to prevent miscommunication.^9-11

CP02210041_t3.png

OUTCOME Lack of follow-up

A home health worker visits Ms. L, communicating with her using voice-to-text. Ms. L has not yet gone to her primary care physician, audiologist, or outpatient psychiatrist for follow-up because she needs to arrange transportation. Ms. L remains distressed by the music she is hearing, which is worse at night, along with her acute hearing loss.

Bottom Line

Hearing loss can predispose a person to psychiatric disorders and symptoms, including depression, delirium, and auditory hallucinations. Psychiatrists should strive to ensure clear communication with patients who are hearing impaired and should refer such patients to appropriate resources to improve outcomes.

Related Resources

• Wang J, Patel D, Francois D. Elaborate hallucinations, but is it a psychotic disorder? Current Psychiatry. 2021;20(2):46-50. doi:10.12788/cp.0091
• Sosland MD, Pinninti N. 5 ways to quiet auditory hallucinations. Current Psychiatry. 2005;4(4):110.
• Convery E, Keidser G, McLelland M, et al. A smartphone app to facilitate remote patient-provider communication in hearing health care: usability and effect on hearing aid outcomes. Telemed E-Health. 2020;26(6):798-804. doi:10.1089/ tmj.2019.0109

Drug Brand Names

Mirtazapine • Remeron
Prednisone • Rayos
Risperidone • Risperdal
Valacyclovir • Valtrex

[embed:render:related:node:235045]

[embed:render:related:node:59961]

CASE New-onset auditory hallucinations

Ms. L, age 78, presents to our hospital with worsening anxiety due to auditory hallucinations. She has been hearing music, which she reports is worse at night and consists of songs, usually the song Jingle Bells, sometimes just melodies and other times with lyrics. Ms. L denies paranoia, visual hallucinations, or worsening mood.

Two weeks ago, Ms. L had visited another hospital, describing 5 days of right-side hearing loss accompanied by pain and burning in her ear and face, along with vesicular lesions in a dermatomal pattern extending into her auditory canal. During this visit, Ms. L’s complete blood count, urine culture, urine drug screen, electrolytes, liver panel, thyroid studies, and vitamin levels were unremarkable. A CT scan of her head showed no abnormalities.

Ms. L was diagnosed with Ramsay Hunt syndrome (herpes zoster oticus), which affects cranial nerves, because of physical examination findings with a dermatomal pattern of lesion distribution and associated pain. Ramsay Hunt syndrome can cause facial paralysis and hearing loss in the affected ear. She was discharged with prescriptions for prednisone 60 mg/d for 7 days and valacyclovir 1 g/d for 7 days and told to follow up with her primary care physician. During the present visit to our hospital, Ms. L’s home health nurse reports that she still has her entire bottles of valacyclovir and prednisone left. Ms. L also has left-side hearing loss that began 5 years ago and a history of recurrent major depressive disorder (MDD) and generalized anxiety disorder. Due to the recent onset of right-side hearing loss, her hearing impairment requires her to communicate via writing or via a voice-to-text app.

HISTORY Depressed and living alone

Ms. L was diagnosed with MDD more than 4 decades ago and has been receiving medication since then. She reports no prior psychiatric hospitalizations, suicide attempts, manic symptoms, or psychotic symptoms. For more than 20 years, she has seen a nurse practitioner, who had prescribed mirtazapine 30 mg/d for MDD, poor appetite, and sleep. Within the last 5 years, her nurse practitioner added risperidone 0.5 mg/d at night to augment the mirtazapine for tearfulness, irritability, and mood swings.

Ms. L’s medical history also includes hypertension and chronic obstructive pulmonary disease. She is a retired teacher and lives alone. She has a chore worker who visits her home for 1 hour 5 days a week to help with cleaning and lifting, and support from her son. Ms. L no longer drives and relies on others for transportation, but is able to manage her finances, activities of daily living, cooking, and walking without any assistance.

[polldaddy:12807642]

EVALUATION Identifying the cause of the music

Ms. L is alert and oriented to time and situation, her concentration is appropriate, and her recent and remote memories are preserved. A full cognitive screen is not performed, but she is able to spell WORLD forwards and backwards and adequately perform a serial 7s test. An examination of her ear does not reveal any open vesicular lesions or swelling, but she continues to report pain and tingling in the C7 dermatomal pattern. Her urine drug screen and infectious and autoimmune laboratory testing are unremarkable. She does not have electrolyte, renal function, or blood count abnormalities. An MRI of her brain that is performed to rule out intracranial pathology due to acute hearing loss shows no acute intracranial abnormalities, with some artifact effect due to motion. Because temporal lobe epilepsy can present with hallucinations,¹ an EEG is performed to rule out seizure activity; it shows a normal wake pattern.

Psychiatry is consulted for management of the auditory hallucinations because Ms. L is distressed by hearing music. Ms. L is evaluated by Neurology and Otolaryngology. Neurology recommends a repeat brain MRI in the outpatient setting after seeing an artifact in the inpatient imaging, as well as follow-up with her primary care physician. Otolaryngology believes her symptoms are secondary to Ramsay Hunt syndrome with incomplete treatment, which is consistent with the initial diagnosis from her previous hospital visit, and recommends another course of oral corticosteroids, along with Audiology and Otolaryngology follow-up.

Continue to: The authors' observations

This is the first case we have seen detailing musical hallucinations (MH) secondary to Ramsay Hunt syndrome, although musical hallucinations have been associated with other etiologies of hearing loss. MH is a “release phenomenon” believed to be caused by deprivation of stimulation of the auditory cortex.² They are categorized as complex auditory hallucinations made up of melodies and rhythms and may be present in up to 2.5% of patients with hearing impairment.¹ The condition is mostly seen in older adults because this population is more likely to experience hearing loss. MH is more common among women (70% to 80% of cases) and is highly comorbid with psychiatric disorders such as schizophrenia, obsessive-compulsive disorder, or (as was the case for Ms. L) MDD.³ Hallucinations secondary to hearing loss may be more common in left-side hearing loss.⁴ In a 2005 study, Warner et al⁵ found religious music such as hymns or Christmas carols was most commonly heard, possibly due to repetitive past exposure.

There is no consensus on treatment for MH. Current treatment guidance comes from case reports and case series. Treatment is generally most successful when the etiology of the hallucination is both apparent and treatable, such as an infectious eitiology.³ In the case of MH due to hearing loss, hallucinations may improve following treatment with hearing aids or cochlear implants,^1,3,6,7 which is what was advised for Ms. L. Table 1^7-9 outlines other possible measures for addressing musical hallucinations.

CP02210041_t1.png

Anticholinesterases, antidepressants, and antiepileptics may provide some benefit.⁸ However, pharmacotherapy is generally less efficacious and can cause adverse effects, so environmental support and hearing aids may be a safer approach. No medications have been shown to completely cure MH.

TREATMENT Hearing loss management and follow-up

When speaking with the consulting psychiatry team, Ms. L reports her outpatient psychotropic regimen has been helpful. The team decides to continue mirtazapine 30 mg/d and risperidone 0.5 mg/d at night. We recommend that Ms. L discuss tapering off risperidone with her outpatient clinician if they feel it may be indicated to reduce the risk of adverse effects. The treatment team decides not to start corticosteroids due to the risk of steroid-induced psychotic symptoms. The team discusses hallucinations related to hearing loss with Ms. L and advise her to follow up with Audiology and Otolaryngology in the outpatient setting.

The authors’ observations

Approximately 40% of people age >60 struggle with hearing impairment^4,9; this impacts their general quality of life and how clinicians communicate with such patients.¹⁰ People with hearing loss are more likely to develop feelings of social isolation, depression, and delirium (Table 2^8,10,11).¹¹

CP02210041_t2.png

Risk factors for hearing loss include tobacco use, metabolic syndrome, exposure to loud noises, and exposure to certain ototoxic medications such as chemotherapeutic agents.¹¹ As psychiatrists, it is important to identify patients who may be at risk for hearing loss and refer them to the appropriate medical professional. If hearing loss is new onset, refer the patient to an otolaryngologist for a full evaluation. Unilateral hearing loss should warrant further workup because this could be due to an acoustic neuroma.¹¹

When providing care for a patient who uses a hearing aid, discuss adherence, barriers to adherence, and difficulties with adjusting the hearing aid. A referral to an audiologist may help patients address these barriers. Patients with hearing impairment or loss may benefit from auditory rehabilitation programs that provide communication strategies, ways to adapt to hearing loss, and information about different assistive options.¹¹ Such programs are often run by audiologists or speech language pathologists and contain both counseling and group components.

Continue to: Is is critical for psychiatrists...

It is critical for psychiatrists to ensure appropriate communication with patients who are hearing impaired (Table 3^8-11). The use of assistive devices such as sound amplifiers, written messages, or family members to assist in communication is needed to prevent miscommunication.^9-11

CP02210041_t3.png

OUTCOME Lack of follow-up

A home health worker visits Ms. L, communicating with her using voice-to-text. Ms. L has not yet gone to her primary care physician, audiologist, or outpatient psychiatrist for follow-up because she needs to arrange transportation. Ms. L remains distressed by the music she is hearing, which is worse at night, along with her acute hearing loss.

Bottom Line

Hearing loss can predispose a person to psychiatric disorders and symptoms, including depression, delirium, and auditory hallucinations. Psychiatrists should strive to ensure clear communication with patients who are hearing impaired and should refer such patients to appropriate resources to improve outcomes.

Related Resources

• Wang J, Patel D, Francois D. Elaborate hallucinations, but is it a psychotic disorder? Current Psychiatry. 2021;20(2):46-50. doi:10.12788/cp.0091
• Sosland MD, Pinninti N. 5 ways to quiet auditory hallucinations. Current Psychiatry. 2005;4(4):110.
• Convery E, Keidser G, McLelland M, et al. A smartphone app to facilitate remote patient-provider communication in hearing health care: usability and effect on hearing aid outcomes. Telemed E-Health. 2020;26(6):798-804. doi:10.1089/ tmj.2019.0109

Drug Brand Names

Mirtazapine • Remeron
Prednisone • Rayos
Risperidone • Risperdal
Valacyclovir • Valtrex

[embed:render:related:node:235045]

[embed:render:related:node:59961]

CASE New-onset auditory hallucinations

Ms. L, age 78, presents to our hospital with worsening anxiety due to auditory hallucinations. She has been hearing music, which she reports is worse at night and consists of songs, usually the song Jingle Bells, sometimes just melodies and other times with lyrics. Ms. L denies paranoia, visual hallucinations, or worsening mood.

Two weeks ago, Ms. L had visited another hospital, describing 5 days of right-side hearing loss accompanied by pain and burning in her ear and face, along with vesicular lesions in a dermatomal pattern extending into her auditory canal. During this visit, Ms. L’s complete blood count, urine culture, urine drug screen, electrolytes, liver panel, thyroid studies, and vitamin levels were unremarkable. A CT scan of her head showed no abnormalities.

Ms. L was diagnosed with Ramsay Hunt syndrome (herpes zoster oticus), which affects cranial nerves, because of physical examination findings with a dermatomal pattern of lesion distribution and associated pain. Ramsay Hunt syndrome can cause facial paralysis and hearing loss in the affected ear. She was discharged with prescriptions for prednisone 60 mg/d for 7 days and valacyclovir 1 g/d for 7 days and told to follow up with her primary care physician. During the present visit to our hospital, Ms. L’s home health nurse reports that she still has her entire bottles of valacyclovir and prednisone left. Ms. L also has left-side hearing loss that began 5 years ago and a history of recurrent major depressive disorder (MDD) and generalized anxiety disorder. Due to the recent onset of right-side hearing loss, her hearing impairment requires her to communicate via writing or via a voice-to-text app.

HISTORY Depressed and living alone

Ms. L was diagnosed with MDD more than 4 decades ago and has been receiving medication since then. She reports no prior psychiatric hospitalizations, suicide attempts, manic symptoms, or psychotic symptoms. For more than 20 years, she has seen a nurse practitioner, who had prescribed mirtazapine 30 mg/d for MDD, poor appetite, and sleep. Within the last 5 years, her nurse practitioner added risperidone 0.5 mg/d at night to augment the mirtazapine for tearfulness, irritability, and mood swings.

Ms. L’s medical history also includes hypertension and chronic obstructive pulmonary disease. She is a retired teacher and lives alone. She has a chore worker who visits her home for 1 hour 5 days a week to help with cleaning and lifting, and support from her son. Ms. L no longer drives and relies on others for transportation, but is able to manage her finances, activities of daily living, cooking, and walking without any assistance.

[polldaddy:12807642]

EVALUATION Identifying the cause of the music

Ms. L is alert and oriented to time and situation, her concentration is appropriate, and her recent and remote memories are preserved. A full cognitive screen is not performed, but she is able to spell WORLD forwards and backwards and adequately perform a serial 7s test. An examination of her ear does not reveal any open vesicular lesions or swelling, but she continues to report pain and tingling in the C7 dermatomal pattern. Her urine drug screen and infectious and autoimmune laboratory testing are unremarkable. She does not have electrolyte, renal function, or blood count abnormalities. An MRI of her brain that is performed to rule out intracranial pathology due to acute hearing loss shows no acute intracranial abnormalities, with some artifact effect due to motion. Because temporal lobe epilepsy can present with hallucinations,¹ an EEG is performed to rule out seizure activity; it shows a normal wake pattern.

Psychiatry is consulted for management of the auditory hallucinations because Ms. L is distressed by hearing music. Ms. L is evaluated by Neurology and Otolaryngology. Neurology recommends a repeat brain MRI in the outpatient setting after seeing an artifact in the inpatient imaging, as well as follow-up with her primary care physician. Otolaryngology believes her symptoms are secondary to Ramsay Hunt syndrome with incomplete treatment, which is consistent with the initial diagnosis from her previous hospital visit, and recommends another course of oral corticosteroids, along with Audiology and Otolaryngology follow-up.

Continue to: The authors' observations

This is the first case we have seen detailing musical hallucinations (MH) secondary to Ramsay Hunt syndrome, although musical hallucinations have been associated with other etiologies of hearing loss. MH is a “release phenomenon” believed to be caused by deprivation of stimulation of the auditory cortex.² They are categorized as complex auditory hallucinations made up of melodies and rhythms and may be present in up to 2.5% of patients with hearing impairment.¹ The condition is mostly seen in older adults because this population is more likely to experience hearing loss. MH is more common among women (70% to 80% of cases) and is highly comorbid with psychiatric disorders such as schizophrenia, obsessive-compulsive disorder, or (as was the case for Ms. L) MDD.³ Hallucinations secondary to hearing loss may be more common in left-side hearing loss.⁴ In a 2005 study, Warner et al⁵ found religious music such as hymns or Christmas carols was most commonly heard, possibly due to repetitive past exposure.

There is no consensus on treatment for MH. Current treatment guidance comes from case reports and case series. Treatment is generally most successful when the etiology of the hallucination is both apparent and treatable, such as an infectious eitiology.³ In the case of MH due to hearing loss, hallucinations may improve following treatment with hearing aids or cochlear implants,^1,3,6,7 which is what was advised for Ms. L. Table 1^7-9 outlines other possible measures for addressing musical hallucinations.

CP02210041_t1.png

Anticholinesterases, antidepressants, and antiepileptics may provide some benefit.⁸ However, pharmacotherapy is generally less efficacious and can cause adverse effects, so environmental support and hearing aids may be a safer approach. No medications have been shown to completely cure MH.

TREATMENT Hearing loss management and follow-up

When speaking with the consulting psychiatry team, Ms. L reports her outpatient psychotropic regimen has been helpful. The team decides to continue mirtazapine 30 mg/d and risperidone 0.5 mg/d at night. We recommend that Ms. L discuss tapering off risperidone with her outpatient clinician if they feel it may be indicated to reduce the risk of adverse effects. The treatment team decides not to start corticosteroids due to the risk of steroid-induced psychotic symptoms. The team discusses hallucinations related to hearing loss with Ms. L and advise her to follow up with Audiology and Otolaryngology in the outpatient setting.

The authors’ observations

Approximately 40% of people age >60 struggle with hearing impairment^4,9; this impacts their general quality of life and how clinicians communicate with such patients.¹⁰ People with hearing loss are more likely to develop feelings of social isolation, depression, and delirium (Table 2^8,10,11).¹¹

CP02210041_t2.png

Risk factors for hearing loss include tobacco use, metabolic syndrome, exposure to loud noises, and exposure to certain ototoxic medications such as chemotherapeutic agents.¹¹ As psychiatrists, it is important to identify patients who may be at risk for hearing loss and refer them to the appropriate medical professional. If hearing loss is new onset, refer the patient to an otolaryngologist for a full evaluation. Unilateral hearing loss should warrant further workup because this could be due to an acoustic neuroma.¹¹

When providing care for a patient who uses a hearing aid, discuss adherence, barriers to adherence, and difficulties with adjusting the hearing aid. A referral to an audiologist may help patients address these barriers. Patients with hearing impairment or loss may benefit from auditory rehabilitation programs that provide communication strategies, ways to adapt to hearing loss, and information about different assistive options.¹¹ Such programs are often run by audiologists or speech language pathologists and contain both counseling and group components.

Continue to: Is is critical for psychiatrists...

It is critical for psychiatrists to ensure appropriate communication with patients who are hearing impaired (Table 3^8-11). The use of assistive devices such as sound amplifiers, written messages, or family members to assist in communication is needed to prevent miscommunication.^9-11

CP02210041_t3.png

OUTCOME Lack of follow-up

A home health worker visits Ms. L, communicating with her using voice-to-text. Ms. L has not yet gone to her primary care physician, audiologist, or outpatient psychiatrist for follow-up because she needs to arrange transportation. Ms. L remains distressed by the music she is hearing, which is worse at night, along with her acute hearing loss.

Bottom Line

Hearing loss can predispose a person to psychiatric disorders and symptoms, including depression, delirium, and auditory hallucinations. Psychiatrists should strive to ensure clear communication with patients who are hearing impaired and should refer such patients to appropriate resources to improve outcomes.

Related Resources

• Wang J, Patel D, Francois D. Elaborate hallucinations, but is it a psychotic disorder? Current Psychiatry. 2021;20(2):46-50. doi:10.12788/cp.0091
• Sosland MD, Pinninti N. 5 ways to quiet auditory hallucinations. Current Psychiatry. 2005;4(4):110.
• Convery E, Keidser G, McLelland M, et al. A smartphone app to facilitate remote patient-provider communication in hearing health care: usability and effect on hearing aid outcomes. Telemed E-Health. 2020;26(6):798-804. doi:10.1089/ tmj.2019.0109

Drug Brand Names

Mirtazapine • Remeron
Prednisone • Rayos
Risperidone • Risperdal
Valacyclovir • Valtrex

[embed:render:related:node:235045]

[embed:render:related:node:59961]

Editor’s note: Readers’ Forum is a department for correspondence from readers that is not in response to articles published in Current Psychiatry. All submissions to Readers’ Forum undergo peer review and are subject to editing for length and style. For more information, contact letters@currentpsychiatry.com.

Throughout my psychiatric clerkship, I (JWF) participated in street medicine, the practice of providing care to patients (typically those who are homeless) at the location they currently reside, such as in a homeless encampment or community shelter. Our clinical team drove to locations that provided housing for patients diagnosed with schizophrenia, where we assisted with medications and blood draws. I remember pulling up the first day and seeing someone outside smoking a cigarette. I soon learned that many people living in such situations were smokers, and that among the substances they used, tobacco was the most common.

One patient said the cigarettes helped him manage the “voices in his head” as well as some of the adverse effects from medication, such as parkinsonism and akathisia. I asked my attending physician about this and she explained that for some patients, using tobacco was a way to mitigate the positive symptoms of schizophrenia and make the adverse effects of their therapy, particularly extrapyramidal symptoms (EPS), more bearable. By the end of my 2-week rotation, I was sure of a trend: our patients with schizophrenia smoked incessantly. Near the end of my rotation, I asked a patient, “Why do you smoke”? The patient looked at me, puzzled, and replied: “I just do.” This exchange only piqued my curiosity, and I could not help but wonder: what is the relationship between tobacco use and schizophrenia? How is tobacco use related to the pathophysiology of schizophrenia? Does tobacco use among patients with schizophrenia ameliorate aspects of their psychosis? Street medicine offered me a window into a biomedically intriguing question, and I wanted to learn more.

What smoking does for patients with schizophrenia

The high prevalence of smoking among patients with schizophrenia (50% to 88%) greatly exceeds the rates of smoking among patients with other psychiatric illnesses.^1,2 The role of smoking in relation to schizophrenia and other psychoses is multidimensional, and evidence implicates smoking as a risk factor for schizophrenia.^3,4

Two mechanisms may help explain tobacco use in patients with schizophrenia: reducing the adverse effects of antipsychotic medications and promoting neural transmission of dopamine. Second-generation antipsychotics (SGAs) are a first-line treatment, but they can produce EPS, metabolic dysregulation, and blood disorders such as hyponatremia and (rarely) agranulocytosis (1% with clozapine).⁵ Compared to those who are nonsmokers, patients with schizophrenia who smoke are more likely to experience more severe symptoms (eg, hallucinations and delusions) and less severe EPS.^5,6 Research suggests that exposure to polycyclic aromatic hydrocarbons released during smoking induces cytochrome P450 1A2, an enzyme that metabolizes antipsychotic medications such as haloperidol, clozapine, and olanzapine. Increased metabolism results in lower serum concentrations of antipsychotics, lower efficacy, and more severe positive symptoms.^5,6

Additionally, tobacco is an activator of nicotinic acetylcholine receptors (nAChR).⁶ When these receptors become activated, dopamine is released. Dopamine serves as a mediator of reward for nicotine use. In the context of schizophrenia, tobacco use opposes the mechanism of action of SGAs, which is to block neural transmission of dopamine.⁶ The etiology of EPS is related to the blockade of postsynaptic dopamine release in the striatum.⁶ By activating nAChR, smoking induces a downstream release of dopamine that can alleviate iatrogenic EPS by restoring neural transmission of dopamine.⁶ Nicotine may also modulate alpha-7 nicotinic receptor dysfunction, and improve the ability to filter out irrelevant environmental stimuli (impaired sensory gating), which can be overwhelming for patients with schizophrenia. It also can improve cognitive dysfunction and attention by inducing the release of dopamine in mesocortical pathways.⁷ The implications of this neural pathway are significant because smoking is significantly greater in tobacco users who are diagnosed with schizophrenia compared to tobacco users who lack a psychiatric diagnosis.^6,7 Smoking may enhance dopaminergic neural transmission to a far greater extent in tobacco users with schizophrenia compared to tobacco users who do not develop schizophrenia, which suggests intrinsic differences at the neuronal level. Neural differences between tobacco users with or without schizophrenia may synergize with smoking in clinically and biologically meaningful ways. These pathways require further research to support or disprove these hypotheses.

Aside from the dopaminergic system, mechanisms influencing tobacco use among patients with schizophrenia may also be related to nicotine’s mild antidepressant effects. Evidence suggests a clinically meaningful association between nicotine dependence and mood disorders, and this association may be due to the antidepressant effects of nicotine.^8-13 Patients with schizophrenia may experience respite from depressive symptoms through their tobacco use, eventually leading to nicotine dependence.

Continue to: Treatment of schizophrenia...

Treatment of schizophrenia involves multimodal management of a patient’s life, including reducing maladaptive habits that are harmful to health. Chronic smoking in patients with schizophrenia is associated not only with atherosclerosis and cardiovascular disease, but also with poor neurologic functioning, such as significant impairment in attention, working memory, learning, executive function, reasoning, problem-solving and speed of processing.¹⁴ One study found that in patients with schizophrenia, smoking increased the 20-year cardiovascular mortality risk by 86%.¹⁵

Despite challenges to abstinence, smoking cessation should be discussed with these patients, especially given the high prevalence of smoking among this vulnerable population. Bupropion and varenicline have been studied in the context of smoking cessation among patients with schizophrenia. Data on varenicline are mixed. Smokers with schizophrenia who received bupropion showed higher rates of abstinence from smoking compared to those who received placebo.¹⁶

As part of the biopsychosocial model of clinical care, sociodemographic factors must be considered in assessing the relationship between tobacco use and schizophrenia, because a large proportion of patients diagnosed with schizophrenia are members of underrepresented minority groups.¹⁷ A PubMed database search using keywords “African American” or “Black,” “tobacco,” and “schizophrenia” located only 12 studies, most of which lacked relevance to this question. Han et al¹⁸ is 1 of the few studies to investigate sociodemographic factors as they relate to tobacco use among adults with psychoses. Social determinants of health and other confounding variables also need defining to truly distinguish causation from correlation, especially regarding tobacco use and its association with other health risk behaviors.¹⁹

Without the street medicine component of the medical school training I received, the pattern of smoking among patients with schizophrenia may have remained invisible or insignificant to me, as tobacco use is not permitted in the inpatient and outpatient academic settings. This experience not only raised insightful questions, but also emphasized the clinical value of seeing patients within their living environment.

Editor’s note: Readers’ Forum is a department for correspondence from readers that is not in response to articles published in Current Psychiatry. All submissions to Readers’ Forum undergo peer review and are subject to editing for length and style. For more information, contact letters@currentpsychiatry.com.

Throughout my psychiatric clerkship, I (JWF) participated in street medicine, the practice of providing care to patients (typically those who are homeless) at the location they currently reside, such as in a homeless encampment or community shelter. Our clinical team drove to locations that provided housing for patients diagnosed with schizophrenia, where we assisted with medications and blood draws. I remember pulling up the first day and seeing someone outside smoking a cigarette. I soon learned that many people living in such situations were smokers, and that among the substances they used, tobacco was the most common.

One patient said the cigarettes helped him manage the “voices in his head” as well as some of the adverse effects from medication, such as parkinsonism and akathisia. I asked my attending physician about this and she explained that for some patients, using tobacco was a way to mitigate the positive symptoms of schizophrenia and make the adverse effects of their therapy, particularly extrapyramidal symptoms (EPS), more bearable. By the end of my 2-week rotation, I was sure of a trend: our patients with schizophrenia smoked incessantly. Near the end of my rotation, I asked a patient, “Why do you smoke”? The patient looked at me, puzzled, and replied: “I just do.” This exchange only piqued my curiosity, and I could not help but wonder: what is the relationship between tobacco use and schizophrenia? How is tobacco use related to the pathophysiology of schizophrenia? Does tobacco use among patients with schizophrenia ameliorate aspects of their psychosis? Street medicine offered me a window into a biomedically intriguing question, and I wanted to learn more.

What smoking does for patients with schizophrenia

The high prevalence of smoking among patients with schizophrenia (50% to 88%) greatly exceeds the rates of smoking among patients with other psychiatric illnesses.^1,2 The role of smoking in relation to schizophrenia and other psychoses is multidimensional, and evidence implicates smoking as a risk factor for schizophrenia.^3,4

Two mechanisms may help explain tobacco use in patients with schizophrenia: reducing the adverse effects of antipsychotic medications and promoting neural transmission of dopamine. Second-generation antipsychotics (SGAs) are a first-line treatment, but they can produce EPS, metabolic dysregulation, and blood disorders such as hyponatremia and (rarely) agranulocytosis (1% with clozapine).⁵ Compared to those who are nonsmokers, patients with schizophrenia who smoke are more likely to experience more severe symptoms (eg, hallucinations and delusions) and less severe EPS.^5,6 Research suggests that exposure to polycyclic aromatic hydrocarbons released during smoking induces cytochrome P450 1A2, an enzyme that metabolizes antipsychotic medications such as haloperidol, clozapine, and olanzapine. Increased metabolism results in lower serum concentrations of antipsychotics, lower efficacy, and more severe positive symptoms.^5,6

Additionally, tobacco is an activator of nicotinic acetylcholine receptors (nAChR).⁶ When these receptors become activated, dopamine is released. Dopamine serves as a mediator of reward for nicotine use. In the context of schizophrenia, tobacco use opposes the mechanism of action of SGAs, which is to block neural transmission of dopamine.⁶ The etiology of EPS is related to the blockade of postsynaptic dopamine release in the striatum.⁶ By activating nAChR, smoking induces a downstream release of dopamine that can alleviate iatrogenic EPS by restoring neural transmission of dopamine.⁶ Nicotine may also modulate alpha-7 nicotinic receptor dysfunction, and improve the ability to filter out irrelevant environmental stimuli (impaired sensory gating), which can be overwhelming for patients with schizophrenia. It also can improve cognitive dysfunction and attention by inducing the release of dopamine in mesocortical pathways.⁷ The implications of this neural pathway are significant because smoking is significantly greater in tobacco users who are diagnosed with schizophrenia compared to tobacco users who lack a psychiatric diagnosis.^6,7 Smoking may enhance dopaminergic neural transmission to a far greater extent in tobacco users with schizophrenia compared to tobacco users who do not develop schizophrenia, which suggests intrinsic differences at the neuronal level. Neural differences between tobacco users with or without schizophrenia may synergize with smoking in clinically and biologically meaningful ways. These pathways require further research to support or disprove these hypotheses.

Aside from the dopaminergic system, mechanisms influencing tobacco use among patients with schizophrenia may also be related to nicotine’s mild antidepressant effects. Evidence suggests a clinically meaningful association between nicotine dependence and mood disorders, and this association may be due to the antidepressant effects of nicotine.^8-13 Patients with schizophrenia may experience respite from depressive symptoms through their tobacco use, eventually leading to nicotine dependence.

Continue to: Treatment of schizophrenia...

Treatment of schizophrenia involves multimodal management of a patient’s life, including reducing maladaptive habits that are harmful to health. Chronic smoking in patients with schizophrenia is associated not only with atherosclerosis and cardiovascular disease, but also with poor neurologic functioning, such as significant impairment in attention, working memory, learning, executive function, reasoning, problem-solving and speed of processing.¹⁴ One study found that in patients with schizophrenia, smoking increased the 20-year cardiovascular mortality risk by 86%.¹⁵

Despite challenges to abstinence, smoking cessation should be discussed with these patients, especially given the high prevalence of smoking among this vulnerable population. Bupropion and varenicline have been studied in the context of smoking cessation among patients with schizophrenia. Data on varenicline are mixed. Smokers with schizophrenia who received bupropion showed higher rates of abstinence from smoking compared to those who received placebo.¹⁶

As part of the biopsychosocial model of clinical care, sociodemographic factors must be considered in assessing the relationship between tobacco use and schizophrenia, because a large proportion of patients diagnosed with schizophrenia are members of underrepresented minority groups.¹⁷ A PubMed database search using keywords “African American” or “Black,” “tobacco,” and “schizophrenia” located only 12 studies, most of which lacked relevance to this question. Han et al¹⁸ is 1 of the few studies to investigate sociodemographic factors as they relate to tobacco use among adults with psychoses. Social determinants of health and other confounding variables also need defining to truly distinguish causation from correlation, especially regarding tobacco use and its association with other health risk behaviors.¹⁹

Without the street medicine component of the medical school training I received, the pattern of smoking among patients with schizophrenia may have remained invisible or insignificant to me, as tobacco use is not permitted in the inpatient and outpatient academic settings. This experience not only raised insightful questions, but also emphasized the clinical value of seeing patients within their living environment.

Editor’s note: Readers’ Forum is a department for correspondence from readers that is not in response to articles published in Current Psychiatry. All submissions to Readers’ Forum undergo peer review and are subject to editing for length and style. For more information, contact letters@currentpsychiatry.com.

Throughout my psychiatric clerkship, I (JWF) participated in street medicine, the practice of providing care to patients (typically those who are homeless) at the location they currently reside, such as in a homeless encampment or community shelter. Our clinical team drove to locations that provided housing for patients diagnosed with schizophrenia, where we assisted with medications and blood draws. I remember pulling up the first day and seeing someone outside smoking a cigarette. I soon learned that many people living in such situations were smokers, and that among the substances they used, tobacco was the most common.

One patient said the cigarettes helped him manage the “voices in his head” as well as some of the adverse effects from medication, such as parkinsonism and akathisia. I asked my attending physician about this and she explained that for some patients, using tobacco was a way to mitigate the positive symptoms of schizophrenia and make the adverse effects of their therapy, particularly extrapyramidal symptoms (EPS), more bearable. By the end of my 2-week rotation, I was sure of a trend: our patients with schizophrenia smoked incessantly. Near the end of my rotation, I asked a patient, “Why do you smoke”? The patient looked at me, puzzled, and replied: “I just do.” This exchange only piqued my curiosity, and I could not help but wonder: what is the relationship between tobacco use and schizophrenia? How is tobacco use related to the pathophysiology of schizophrenia? Does tobacco use among patients with schizophrenia ameliorate aspects of their psychosis? Street medicine offered me a window into a biomedically intriguing question, and I wanted to learn more.

What smoking does for patients with schizophrenia

The high prevalence of smoking among patients with schizophrenia (50% to 88%) greatly exceeds the rates of smoking among patients with other psychiatric illnesses.^1,2 The role of smoking in relation to schizophrenia and other psychoses is multidimensional, and evidence implicates smoking as a risk factor for schizophrenia.^3,4

Two mechanisms may help explain tobacco use in patients with schizophrenia: reducing the adverse effects of antipsychotic medications and promoting neural transmission of dopamine. Second-generation antipsychotics (SGAs) are a first-line treatment, but they can produce EPS, metabolic dysregulation, and blood disorders such as hyponatremia and (rarely) agranulocytosis (1% with clozapine).⁵ Compared to those who are nonsmokers, patients with schizophrenia who smoke are more likely to experience more severe symptoms (eg, hallucinations and delusions) and less severe EPS.^5,6 Research suggests that exposure to polycyclic aromatic hydrocarbons released during smoking induces cytochrome P450 1A2, an enzyme that metabolizes antipsychotic medications such as haloperidol, clozapine, and olanzapine. Increased metabolism results in lower serum concentrations of antipsychotics, lower efficacy, and more severe positive symptoms.^5,6

Additionally, tobacco is an activator of nicotinic acetylcholine receptors (nAChR).⁶ When these receptors become activated, dopamine is released. Dopamine serves as a mediator of reward for nicotine use. In the context of schizophrenia, tobacco use opposes the mechanism of action of SGAs, which is to block neural transmission of dopamine.⁶ The etiology of EPS is related to the blockade of postsynaptic dopamine release in the striatum.⁶ By activating nAChR, smoking induces a downstream release of dopamine that can alleviate iatrogenic EPS by restoring neural transmission of dopamine.⁶ Nicotine may also modulate alpha-7 nicotinic receptor dysfunction, and improve the ability to filter out irrelevant environmental stimuli (impaired sensory gating), which can be overwhelming for patients with schizophrenia. It also can improve cognitive dysfunction and attention by inducing the release of dopamine in mesocortical pathways.⁷ The implications of this neural pathway are significant because smoking is significantly greater in tobacco users who are diagnosed with schizophrenia compared to tobacco users who lack a psychiatric diagnosis.^6,7 Smoking may enhance dopaminergic neural transmission to a far greater extent in tobacco users with schizophrenia compared to tobacco users who do not develop schizophrenia, which suggests intrinsic differences at the neuronal level. Neural differences between tobacco users with or without schizophrenia may synergize with smoking in clinically and biologically meaningful ways. These pathways require further research to support or disprove these hypotheses.

Aside from the dopaminergic system, mechanisms influencing tobacco use among patients with schizophrenia may also be related to nicotine’s mild antidepressant effects. Evidence suggests a clinically meaningful association between nicotine dependence and mood disorders, and this association may be due to the antidepressant effects of nicotine.^8-13 Patients with schizophrenia may experience respite from depressive symptoms through their tobacco use, eventually leading to nicotine dependence.

Continue to: Treatment of schizophrenia...

Treatment of schizophrenia involves multimodal management of a patient’s life, including reducing maladaptive habits that are harmful to health. Chronic smoking in patients with schizophrenia is associated not only with atherosclerosis and cardiovascular disease, but also with poor neurologic functioning, such as significant impairment in attention, working memory, learning, executive function, reasoning, problem-solving and speed of processing.¹⁴ One study found that in patients with schizophrenia, smoking increased the 20-year cardiovascular mortality risk by 86%.¹⁵

Despite challenges to abstinence, smoking cessation should be discussed with these patients, especially given the high prevalence of smoking among this vulnerable population. Bupropion and varenicline have been studied in the context of smoking cessation among patients with schizophrenia. Data on varenicline are mixed. Smokers with schizophrenia who received bupropion showed higher rates of abstinence from smoking compared to those who received placebo.¹⁶

As part of the biopsychosocial model of clinical care, sociodemographic factors must be considered in assessing the relationship between tobacco use and schizophrenia, because a large proportion of patients diagnosed with schizophrenia are members of underrepresented minority groups.¹⁷ A PubMed database search using keywords “African American” or “Black,” “tobacco,” and “schizophrenia” located only 12 studies, most of which lacked relevance to this question. Han et al¹⁸ is 1 of the few studies to investigate sociodemographic factors as they relate to tobacco use among adults with psychoses. Social determinants of health and other confounding variables also need defining to truly distinguish causation from correlation, especially regarding tobacco use and its association with other health risk behaviors.¹⁹

Without the street medicine component of the medical school training I received, the pattern of smoking among patients with schizophrenia may have remained invisible or insignificant to me, as tobacco use is not permitted in the inpatient and outpatient academic settings. This experience not only raised insightful questions, but also emphasized the clinical value of seeing patients within their living environment.

Parkinson’s disease (PD) is a neurodegenerative condition diagnosed pathologically by alpha synuclein–containing Lewy bodies and dopaminergic cell loss in the substantia nigra pars compacta of the midbrain. Loss of dopaminergic input to the caudate and putamen disrupts the direct and indirect basal ganglia pathways for motor control and contributes to the motor symptoms of PD.¹ According to the Movement Disorder Society criteria, PD is diagnosed clinically by bradykinesia (slowness of movement) plus resting tremor and/or rigidity in the presence of supportive criteria, such as levodopa responsiveness and hyposmia, and in the absence of exclusion criteria and red flags that would suggest atypical parkinsonism or an alternative diagnosis.²

Although the diagnosis and treatment of PD focus heavily on the motor symptoms, nonmotor symptoms can arise decades before the onset of motor symptoms and continue throughout the lifespan. Nonmotor symptoms affect patients from head (ie, cognition and mood) to toe (ie, striatal toe pain) and multiple organ systems in between, including the olfactory, integumentary, cardiovascular, gastrointestinal, genitourinary, and autonomic nervous systems. Thus, it is not surprising that nonmotor symptoms of PD impact health-related quality of life more substantially than motor symptoms.³ A helpful analogy is to consider the motor symptoms of PD as the tip of the iceberg and the nonmotor symptoms as the larger, submerged portions of the iceberg.⁴

Nonmotor symptoms can negatively impact the treatment of motor symptoms. For example, imagine a patient who is very rigid and dyscoordinated in the arms and legs, which limits their ability to dress and walk. If this patient also suffers from nonmotor symptoms of orthostatic hypotension and psychosis—both of which can be exacerbated by levodopa—dose escalation of levodopa for the rigidity and dyscoordination could be compromised, rendering the patient undertreated and less mobile.

In this review, we focus on identifying and managing nonmotor symptoms of PD that are relevant to psychiatric practice, including mood and motivational disorders, anxiety disorders, psychosis, cognitive disorders, and disorders related to the pharmacologic and surgical treatment of PD (Figure 1).

CP02210014_f1.png

Mood and motivational disorders

Depression

Depression is a common symptom in PD that can occur in the prodromal period years to decades before the onset of motor symptoms, as well as throughout the disease course.⁵ The prevalence of depression in PD varies from 3% to 90%, depending on the methods of assessment, clinical setting of assessment, motor symptom severity, and other factors; clinically significant depression likely affects approximately 35% to 38% of patients.^5,6 How depression in patients with PD differs from depression in the general population is not entirely understood, but there does seem to be less guilt and suicidal ideation and a substantial component of negative affect, including dysphoria and anxiety.⁷ Practically speaking, depression is treated similarly in PD and general populations, with a few considerations.

Despite limited randomized controlled trials (RCTs) for efficacy specifically in patients with PD, selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) are generally considered first-line treatments. There is also evidence for tricyclic antidepressants (TCAs), but due to potential worsening of orthostatic hypotension and cognition, TCAs may not be a favorable option for certain patients with PD.^8,9 All antidepressants have the potential to worsen tremor. Theoretically, SNRIs, with noradrenergic activity, may be less tolerable than SSRIs in patients with PD. However, worsening tremor generally has not been a clinically significant adverse event reported in PD depression clinical trials, although it was seen in 17% of patients receiving paroxetine and 21% of patients receiving venlafaxine compared to 7% of patients receiving placebo.^9-11 If tremor worsens, mirtazapine could be considered because it has been reported to cause less tremor than SSRIs or TCAs.¹²

Among medications for PD, pramipexole, a dopamine agonist, may have a beneficial effect on depression.¹³ Additionally, some evidence supports rasagiline, a monoamine oxidase type B inhibitor, as an adjunctive medication for depression in PD.¹⁴ Nevertheless, antidepressant medications remain the standard pharmacologic treatment for PD depression.

Continue to: In terms of nonpharmacologic options...

In terms of nonpharmacologic options, cognitive-behavioral therapy (CBT) is likely efficacious, exercise (especially yoga) is likely efficacious, and repetitive transcranial magnetic stimulation may be efficacious.^15,16 While further high-quality trials are needed, these treatments are low-risk and can be considered, especially for patients who cannot tolerate medications.

Apathy

Apathy—a loss of motivation and goal-directed behavior—can occur in up to 30% of patients during the prodromal period of PD, and in up to 70% of patients throughout the disease course.¹⁷ Apathy can coexist with depression, which can make apathy difficult to diagnose.¹⁷ Given the time constraints of a clinic visit, a practical approach would be to first screen for depression and cognitive impairment. If there is continued suspicion of apathy, the Movement Disorder Society-Sponsored Revision of the Unified Parkinson’s Disease Rating Scale part I question (“In the past week have you felt indifferent to doing activities or being with people?”) can be used to screen for apathy, and more detailed scales, such as the Apathy Scale (AS) or Lille Apathy Rating Scale (LARS), could be used if indicated.¹⁸

There are limited high-quality positive trials of apathy-specific treatments in PD. In an RCT of patients with PD who did not have depression or dementia, rivastigmine improved LARS scores compared to placebo.¹⁵ Piribedil, a D2/D3 receptor agonist, improved apathy in patients who underwent subthalamic nucleus deep brain stimulation (STN DBS).¹⁵ Exercise such as individualized physical therapy programs, dance, and Nordic walking as well as mindfulness interventions were shown to significantly reduce apathy scale scores.¹⁹ SSRIs, SNRIs, and rotigotine showed a trend toward reducing AS scores in RCTs.^10,20

Larger, high-quality studies are needed to clarify the treatment of apathy in PD. In the meantime, a reasonable approach is to first treat any comorbid psychiatric or cognitive disorders, since apathy can be associated with these conditions, and to optimize antiparkinsonian medications for motor symptoms, motor fluctuations, and nonmotor fluctuations. Then, the investigational apathy treatments described in this section could be considered on an individual basis.

Anxiety disorders

Anxiety is seen throughout the disease course of PD in approximately 30% to 50% of patients.²¹ It can manifest as generalized anxiety disorder, panic disorder, and other anxiety disorders. There are no high-quality RCTs of pharmacologic treatments of anxiety specifically in patients with PD, except for a negative safety and tolerability study of buspirone in which one-half of patients experienced worsening motor symptoms.^15,22 Thus, the treatment of anxiety in patients with PD is similar to treatments in the general population. SSRIs and SNRIs are typically considered first-line, benzodiazepines are sometimes used with caution (although cognitive adverse effects and fall risk need to be considered), and nonpharma­cologic treatments such as mindfulness yoga, exercise, CBT, and psycho­therapy can be effective.^16,21,23

Continue to: Because there is the lack...

Because there is the lack of evidence-based treatments for anxiety in PD, we highlight 2 PD-specific anxiety disorders: internal tremor, and nonmotor “off” anxiety.

Internal tremor

Internal tremor is a sense of vibration in the axial and/or appendicular muscles that cannot be seen externally by the patient or examiner. It is not yet fully understood if this phenomenon is sensory, anxiety-related, related to subclinical tremor, or the result of a combination of these factors (ie, sensory awareness of a subclinical tremor that triggers or is worsened by anxiety). There is some evidence for subclinical tremor on electromyography, but internal tremor does not respond to antiparkinsonian medications in 70% of patients.²⁴ More electrophysiological research is needed to clarify this phenomenon. Internal tremor has been associated with anxiety in 64% of patients and often improves with anxiolytic therapies.²⁴

Although poorly understood, internal tremor is a documented phenomenon in 33% to 44% of patients with PD, and in some cases, it may be an initial symptom that motivates a patient to seek medical attention for the first time.^24,25 Internal tremor has also been reported in patients with essential tremor and multiple sclerosis.²⁵ Therefore, physicians should be aware of internal tremor because this symptom could herald an underlying neurological disease.

Nonmotor ‘off’ anxiety

Patients with PD are commonly prescribed carbidopa-levodopa, a dopamine precursor, at least 3 times daily. Initially, this medication controls motor symptoms well from 1 dose to the next. However, as the disease progresses, some patients report motor fluctuations in which an individual dose of carbidopa-levodopa may wear off early, take longer than usual to take effect, or not take effect at all. Patients describe these periods as an “off” state in which they do not feel their medications are working. Such motor fluctuations can lead to anxiety and avoidance behaviors, because patients fear being in public at times when the medication does not adequately control their motor symptoms.

In addition to these motor symptom fluctuations and related anxiety, patients can also experience nonmotor symptom fluctuations. A wide variety of nonmotor symptoms, such as mood, cognitive, and behavioral symptoms, have been reported to fluctuate in parallel with motor symptoms.^26,27 One study reported fluctuating restlessness in 39% of patients with PD, excessive worry in 17%, shortness of breath in 13%, excessive sweating and fear in 12%, and palpitations in 10%.²⁷ A patient with fluctuating shortness of breath, sweating, and palpitations (for example) may repeatedly present to the emergency department with a negative cardiac workup and eventually be diagnosed with panic disorder, whereas the patient is truly experiencing nonmotor “off” symptoms. Thus, it is important to be aware of nonmotor fluctuations so this diagnosis can be made and the symptoms appropriately treated. The first step in treating nonmotor fluctuations is to optimize the antiparkinsonian regimen to minimize fluctuations. If “off” anxiety symptoms persist, anxiolytic medications can be prescribed.²¹

Continue to: Psychosis

Psychosis can occur in prodromal and early PD but is most common in advanced PD.²⁸ One study reported that 60% of patients developed hallucinations or delusions after 12 years of follow-up.²⁹ Disease duration, disease severity, dementia, and rapid eye movement sleep behavior disorder are significant risk factors for psychosis in PD.³⁰ Well-formed visual hallucinations are the most common manifestation of psychosis in patients with PD. Auditory hallucinations and delusions are less common. Delusions are usually seen in patients with dementia and are often paranoid delusions, such as of spousal infidelity.³⁰ Sensory hallucinations can occur, but should not be mistaken with formication, a central pain syndrome in PD that can represent a nonmotor “off” symptom that may respond to dopaminergic medication.³¹ Other more mild psychotic symptoms include illusions or misinterpretation of stimuli, false sense of presence, and passage hallucinations of fleeting figures in the peripheral vision.³⁰

The pathophysiology of PD psychosis is not entirely understood but differs from psychosis in other disorders. It can occur in the absence of antiparkinsonian medication exposure and is thought to be a consequence of the underlying disease process of PD involving neurodegeneration in certain brain regions and aberrant neurotransmission of not only dopamine but also serotonin, acetylcholine, and glutamate.³⁰

Figure 2 outlines the management of psychosis in PD. After addressing medical and medication-related causes, it is important to determine if the psychotic symptom is sufficiently bothersome to and/or potentially dangerous for the patient to warrant treatment. If treatment is indicated, pimavanserin and clozapine are efficacious for psychosis in PD without worsening motor symptoms, and quetiapine is possibly efficacious with a low risk of worsening motor symptoms.¹⁵ Other antipsychotics, such as olanzapine, risperidone, and haloperidol, can substantially worsen motor symptoms.¹⁵ Both second-generation antipsychotics and pimavanserin have an FDA black-box warning for a higher risk of all-cause mortality in older patients with dementia; however, because psychosis is associated with early mortality in PD, the risk/benefit ratio should be discussed with the patient and family for shared decision-making.³⁰ If the patient also has dementia, rivastigmine—which is FDA-approved for PD dementia (PDD)—may also improve hallucinations.³²

CP02210014_f2.png

Cognitive disorders

This section focuses on PD mild cognitive impairment (PD-MCI) and PDD. When a patient with PD reports cognitive concerns, the approach outlined in Figure 3 can be used to diagnose the cognitive disorder. A detailed history, medication review, and physical examination can identify any medical or psychiatric conditions that could affect cognition. The American Academy of Neurology recommends screening for depression, obtaining blood levels of vitamin B12 and thyroid-stimulating hormone, and obtaining a CT or MRI of the brain to rule out reversible causes of dementia.³³ A validated screening test such as the Montreal Cognitive Assessment, which has higher sensitivity for PD-MCI than the Mini-Mental State Examination, is used to identify and quantify cognitive impairment.³⁴ Neuropsychological testing is the gold standard and can be used to confirm and/or better quantify the degree and domains of cognitive impairment.³⁵ Typically, cognitive deficits in PD affect executive function, attention, and/or visuospatial domains more than memory and language early on, and deficits in visuospatial and language domains have the highest sensitivity for predicting progression to PDD.³⁶

CP02210014_f3.png

Once reversible causes of dementia are addressed or ruled out and cognitive testing is completed, the Movement Disorder Society (MDS) criteria for PD-MCI and PDD summarized in Figure 3 can be used to diagnose the cognitive disorder.^37,38 The MDS criteria for PDD require a diagnosis of PD for ≥1 year prior to the onset of dementia to differentiate PDD from dementia with Lewy bodies (DLB). If the dementia starts within 1 year of the onset of parkinsonism, the diagnosis would be DLB. PDD and DLB are on the spectrum of Lewy body dementia, with the same Lewy body pathology in different temporal and spatial distributions in the brain.³⁸

Continue to: PD-MCI is present in...

PD-MCI is present in approximately 25% of patients.³⁵ PD-MCI does not always progress to dementia but increases the risk of dementia 6-fold. The prevalence of PDD increases with disease duration; it is present in approximately 50% of patients at 10 years and 80% of patients at 20 years of disease.³⁵ Rivastigmine is the only FDA-approved medication to slow progression of PDD. There is insufficient evidence for other acetylcholinesterase inhibitors and memantine.¹⁵ Unfortunately, RCTs of pharmacotherapy for PD-MCI have failed to show efficacy. However, exercise, cognitive rehabilitation, and neuromodulation are being studied. In the meantime, addressing modifiable risk factors (such as vascular risk factors and alcohol consumption) and treating comorbid orthostatic hypotension, obstructive sleep apnea, and depression may improve cognition.^35,39

Treatment-related disorders

Impulse control disorders

Impulse control disorders (ICDs) are an important medication-related consideration in patients with PD. The ICDs seen in PD include pathological gambling, binge eating, excessive shopping, hypersexual behaviors, and dopamine dysregulation syndrome (Table). These disorders are more common in younger patients with a history of impulsive personality traits and addictive behaviors (eg, history of tobacco or alcohol abuse), and are most strongly associated with dopaminergic therapies, particularly the dopamine agonists.^40,41 In the DOMINION study, the odds of ICDs were 2- to 3.5-fold higher in patients taking dopamine agonists.⁴² This is mainly thought to be due to stimulation of D2/D3 receptors in the mesolimbic system.⁴⁰ High doses of levodopa, monoamine oxidase inhibitors, and amantadine are also associated with ICDs.^40-42

CP02210014_t1.png

The first step in managing ICDs is diagnosing them, which can be difficult because patients often are not forthcoming about these problems due to embarrassment or failure to recognize that the ICD is related to PD medications. If a family member accompanies the patient at the visit, the patient may not want to disclose the amount of money they spend or the extent to which the behavior is a problem. Thus, a screening questionnaire, such as the Questionnaire for Impulsive-Compulsive Disorders in Parkinson’s Disease (QUIP) can be a helpful way for patients to alert the clinician to the issue.⁴¹ Education for the patient and family is crucial before the ICD causes significant financial, health, or relationship problems.

The mainstay of treatment is to reduce or taper off the dopamine agonist or other offending agent while monitoring for worsening motor symptoms and dopamine withdrawal syndrome. If this is unsuccessful, there is very limited evidence for further treatment strategies (Table), including antidepressants, antipsychotics, and mood stabilizers.^40,43,44 There is insufficient evidence for naltrexone based on an RCT that failed to meet its primary endpoint, although naltrexone did significantly reduce QUIP scores.^15,44 There is also insufficient evidence for amantadine, which showed benefit in some studies but was associated with ICDs in the DOMINION study.^15,40,42 In terms of nonpharmacologic treatments, CBT is likely efficacious.^15,40 There are mixed results for STN DBS. Some studies showed improvement in the ICD, due at least in part to dopaminergic medication reduction postoperatively, but this treatment has also been reported to increase impulsivity.^40,45

Deep brain stimulation–related disorders

For patients with PD, the ideal lead location for STN DBS is the dorsolateral aspect of the STN, as this is the motor region of the nucleus. The STN functions in indirect and hyperdirect pathways to put the brake on certain motor programs so only the desired movement can be executed. Its function is clinically demonstrated by patients with STN stroke who develop excessive ballistic movements. Adjacent to the motor region of the STN is a centrally located associative region and a medially located limbic region. Thus, when stimulating the dorsolateral STN, current can spread to those regions as well, and the STN’s ability to put the brake on behavioral and emotional programs can be affected.⁴⁶ Stimulation of the STN has been associated with mania, euphoria, new-onset ICDs, decreased verbal fluency, and executive dysfunction. Depression, apathy, and anxiety can also occur, but more commonly result from rapid withdrawal of antiparkinsonian medications after DBS surgery.^46,47 Therefore, for PD patients with DBS with new or worsening psychiatric or cognitive symptoms, it is important to inquire about any recent programming sessions with neurology as well as recent self-increases in stimulation by the patient using their controller. Collaboration with neurology is important to troubleshoot whether stimulation could be contributing to the patient’s psychiatric or cognitive symptoms.

Continue to: Bottom Line

Mood, anxiety, psychotic, and cognitive symptoms and disorders are common psychiatric manifestations associated with Parkinson’s disease (PD). In addition, patients with PD may experience impulsive control disorders and other symptoms related to treatments they receive for PD. Careful assessment and collaboration with neurology is crucial to alleviating the effects of these conditions.

Related Resources

• Weintraub D, Aarsland D, Chaudhuri KR, et al. The neuropsychiatry of Parkinson’s disease: advances and challenges. Lancet Neurology. 2022;21(1):89-102. doi:10.1016/S1474-4422(21)00330-6
• Goldman JG, Guerra CM. Treatment of nonmotor symptoms associated with Parkinson disease. Neurologic Clinics. 2020;38(2):269-292. doi:10.1016/j.ncl.2019.12.003
• Castrioto A, Lhommee E, Moro E et al. Mood and behavioral effects of subthalamic stimulation in Parkinson’s disease. Lancet Neurology. 2014;13(3):287-305. doi:10.1016/ S1474-4422(13)70294-1

Drug Brand Names

Amantadine • Gocovri
Carbidopa-levodopa • Sinemet
Clozapine • Clozaril
Haloperidol • Haldol
Memantine • Namenda
Mirtazapine • Remeron
Naltrexone • Vivitrol
Olanzapine • Zyprexa
Paroxetine • Paxil
Pimavanserin • Nuplazid
Piribedil • Pronoran
Pramipexole • Mirapex
Quetiapine • Seroquel
Rasagiline • Azilect
Risperidone • Risperdal
Rivastigmine • Exelon
Ropinirole • Requip
Rotigotine • Neupro
Venlafaxine • Effexor
Zonisamide • Zonegran

Parkinson’s disease (PD) is a neurodegenerative condition diagnosed pathologically by alpha synuclein–containing Lewy bodies and dopaminergic cell loss in the substantia nigra pars compacta of the midbrain. Loss of dopaminergic input to the caudate and putamen disrupts the direct and indirect basal ganglia pathways for motor control and contributes to the motor symptoms of PD.¹ According to the Movement Disorder Society criteria, PD is diagnosed clinically by bradykinesia (slowness of movement) plus resting tremor and/or rigidity in the presence of supportive criteria, such as levodopa responsiveness and hyposmia, and in the absence of exclusion criteria and red flags that would suggest atypical parkinsonism or an alternative diagnosis.²

Although the diagnosis and treatment of PD focus heavily on the motor symptoms, nonmotor symptoms can arise decades before the onset of motor symptoms and continue throughout the lifespan. Nonmotor symptoms affect patients from head (ie, cognition and mood) to toe (ie, striatal toe pain) and multiple organ systems in between, including the olfactory, integumentary, cardiovascular, gastrointestinal, genitourinary, and autonomic nervous systems. Thus, it is not surprising that nonmotor symptoms of PD impact health-related quality of life more substantially than motor symptoms.³ A helpful analogy is to consider the motor symptoms of PD as the tip of the iceberg and the nonmotor symptoms as the larger, submerged portions of the iceberg.⁴

Nonmotor symptoms can negatively impact the treatment of motor symptoms. For example, imagine a patient who is very rigid and dyscoordinated in the arms and legs, which limits their ability to dress and walk. If this patient also suffers from nonmotor symptoms of orthostatic hypotension and psychosis—both of which can be exacerbated by levodopa—dose escalation of levodopa for the rigidity and dyscoordination could be compromised, rendering the patient undertreated and less mobile.

In this review, we focus on identifying and managing nonmotor symptoms of PD that are relevant to psychiatric practice, including mood and motivational disorders, anxiety disorders, psychosis, cognitive disorders, and disorders related to the pharmacologic and surgical treatment of PD (Figure 1).

CP02210014_f1.png

Mood and motivational disorders

Depression

Depression is a common symptom in PD that can occur in the prodromal period years to decades before the onset of motor symptoms, as well as throughout the disease course.⁵ The prevalence of depression in PD varies from 3% to 90%, depending on the methods of assessment, clinical setting of assessment, motor symptom severity, and other factors; clinically significant depression likely affects approximately 35% to 38% of patients.^5,6 How depression in patients with PD differs from depression in the general population is not entirely understood, but there does seem to be less guilt and suicidal ideation and a substantial component of negative affect, including dysphoria and anxiety.⁷ Practically speaking, depression is treated similarly in PD and general populations, with a few considerations.

Despite limited randomized controlled trials (RCTs) for efficacy specifically in patients with PD, selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) are generally considered first-line treatments. There is also evidence for tricyclic antidepressants (TCAs), but due to potential worsening of orthostatic hypotension and cognition, TCAs may not be a favorable option for certain patients with PD.^8,9 All antidepressants have the potential to worsen tremor. Theoretically, SNRIs, with noradrenergic activity, may be less tolerable than SSRIs in patients with PD. However, worsening tremor generally has not been a clinically significant adverse event reported in PD depression clinical trials, although it was seen in 17% of patients receiving paroxetine and 21% of patients receiving venlafaxine compared to 7% of patients receiving placebo.^9-11 If tremor worsens, mirtazapine could be considered because it has been reported to cause less tremor than SSRIs or TCAs.¹²

Among medications for PD, pramipexole, a dopamine agonist, may have a beneficial effect on depression.¹³ Additionally, some evidence supports rasagiline, a monoamine oxidase type B inhibitor, as an adjunctive medication for depression in PD.¹⁴ Nevertheless, antidepressant medications remain the standard pharmacologic treatment for PD depression.

Continue to: In terms of nonpharmacologic options...

In terms of nonpharmacologic options, cognitive-behavioral therapy (CBT) is likely efficacious, exercise (especially yoga) is likely efficacious, and repetitive transcranial magnetic stimulation may be efficacious.^15,16 While further high-quality trials are needed, these treatments are low-risk and can be considered, especially for patients who cannot tolerate medications.

Apathy

Apathy—a loss of motivation and goal-directed behavior—can occur in up to 30% of patients during the prodromal period of PD, and in up to 70% of patients throughout the disease course.¹⁷ Apathy can coexist with depression, which can make apathy difficult to diagnose.¹⁷ Given the time constraints of a clinic visit, a practical approach would be to first screen for depression and cognitive impairment. If there is continued suspicion of apathy, the Movement Disorder Society-Sponsored Revision of the Unified Parkinson’s Disease Rating Scale part I question (“In the past week have you felt indifferent to doing activities or being with people?”) can be used to screen for apathy, and more detailed scales, such as the Apathy Scale (AS) or Lille Apathy Rating Scale (LARS), could be used if indicated.¹⁸

There are limited high-quality positive trials of apathy-specific treatments in PD. In an RCT of patients with PD who did not have depression or dementia, rivastigmine improved LARS scores compared to placebo.¹⁵ Piribedil, a D2/D3 receptor agonist, improved apathy in patients who underwent subthalamic nucleus deep brain stimulation (STN DBS).¹⁵ Exercise such as individualized physical therapy programs, dance, and Nordic walking as well as mindfulness interventions were shown to significantly reduce apathy scale scores.¹⁹ SSRIs, SNRIs, and rotigotine showed a trend toward reducing AS scores in RCTs.^10,20

Larger, high-quality studies are needed to clarify the treatment of apathy in PD. In the meantime, a reasonable approach is to first treat any comorbid psychiatric or cognitive disorders, since apathy can be associated with these conditions, and to optimize antiparkinsonian medications for motor symptoms, motor fluctuations, and nonmotor fluctuations. Then, the investigational apathy treatments described in this section could be considered on an individual basis.

Anxiety disorders

Anxiety is seen throughout the disease course of PD in approximately 30% to 50% of patients.²¹ It can manifest as generalized anxiety disorder, panic disorder, and other anxiety disorders. There are no high-quality RCTs of pharmacologic treatments of anxiety specifically in patients with PD, except for a negative safety and tolerability study of buspirone in which one-half of patients experienced worsening motor symptoms.^15,22 Thus, the treatment of anxiety in patients with PD is similar to treatments in the general population. SSRIs and SNRIs are typically considered first-line, benzodiazepines are sometimes used with caution (although cognitive adverse effects and fall risk need to be considered), and nonpharma­cologic treatments such as mindfulness yoga, exercise, CBT, and psycho­therapy can be effective.^16,21,23

Continue to: Because there is the lack...

Because there is the lack of evidence-based treatments for anxiety in PD, we highlight 2 PD-specific anxiety disorders: internal tremor, and nonmotor “off” anxiety.

Internal tremor

Internal tremor is a sense of vibration in the axial and/or appendicular muscles that cannot be seen externally by the patient or examiner. It is not yet fully understood if this phenomenon is sensory, anxiety-related, related to subclinical tremor, or the result of a combination of these factors (ie, sensory awareness of a subclinical tremor that triggers or is worsened by anxiety). There is some evidence for subclinical tremor on electromyography, but internal tremor does not respond to antiparkinsonian medications in 70% of patients.²⁴ More electrophysiological research is needed to clarify this phenomenon. Internal tremor has been associated with anxiety in 64% of patients and often improves with anxiolytic therapies.²⁴

Although poorly understood, internal tremor is a documented phenomenon in 33% to 44% of patients with PD, and in some cases, it may be an initial symptom that motivates a patient to seek medical attention for the first time.^24,25 Internal tremor has also been reported in patients with essential tremor and multiple sclerosis.²⁵ Therefore, physicians should be aware of internal tremor because this symptom could herald an underlying neurological disease.

Nonmotor ‘off’ anxiety

Patients with PD are commonly prescribed carbidopa-levodopa, a dopamine precursor, at least 3 times daily. Initially, this medication controls motor symptoms well from 1 dose to the next. However, as the disease progresses, some patients report motor fluctuations in which an individual dose of carbidopa-levodopa may wear off early, take longer than usual to take effect, or not take effect at all. Patients describe these periods as an “off” state in which they do not feel their medications are working. Such motor fluctuations can lead to anxiety and avoidance behaviors, because patients fear being in public at times when the medication does not adequately control their motor symptoms.

In addition to these motor symptom fluctuations and related anxiety, patients can also experience nonmotor symptom fluctuations. A wide variety of nonmotor symptoms, such as mood, cognitive, and behavioral symptoms, have been reported to fluctuate in parallel with motor symptoms.^26,27 One study reported fluctuating restlessness in 39% of patients with PD, excessive worry in 17%, shortness of breath in 13%, excessive sweating and fear in 12%, and palpitations in 10%.²⁷ A patient with fluctuating shortness of breath, sweating, and palpitations (for example) may repeatedly present to the emergency department with a negative cardiac workup and eventually be diagnosed with panic disorder, whereas the patient is truly experiencing nonmotor “off” symptoms. Thus, it is important to be aware of nonmotor fluctuations so this diagnosis can be made and the symptoms appropriately treated. The first step in treating nonmotor fluctuations is to optimize the antiparkinsonian regimen to minimize fluctuations. If “off” anxiety symptoms persist, anxiolytic medications can be prescribed.²¹

Continue to: Psychosis

Psychosis can occur in prodromal and early PD but is most common in advanced PD.²⁸ One study reported that 60% of patients developed hallucinations or delusions after 12 years of follow-up.²⁹ Disease duration, disease severity, dementia, and rapid eye movement sleep behavior disorder are significant risk factors for psychosis in PD.³⁰ Well-formed visual hallucinations are the most common manifestation of psychosis in patients with PD. Auditory hallucinations and delusions are less common. Delusions are usually seen in patients with dementia and are often paranoid delusions, such as of spousal infidelity.³⁰ Sensory hallucinations can occur, but should not be mistaken with formication, a central pain syndrome in PD that can represent a nonmotor “off” symptom that may respond to dopaminergic medication.³¹ Other more mild psychotic symptoms include illusions or misinterpretation of stimuli, false sense of presence, and passage hallucinations of fleeting figures in the peripheral vision.³⁰

The pathophysiology of PD psychosis is not entirely understood but differs from psychosis in other disorders. It can occur in the absence of antiparkinsonian medication exposure and is thought to be a consequence of the underlying disease process of PD involving neurodegeneration in certain brain regions and aberrant neurotransmission of not only dopamine but also serotonin, acetylcholine, and glutamate.³⁰

Figure 2 outlines the management of psychosis in PD. After addressing medical and medication-related causes, it is important to determine if the psychotic symptom is sufficiently bothersome to and/or potentially dangerous for the patient to warrant treatment. If treatment is indicated, pimavanserin and clozapine are efficacious for psychosis in PD without worsening motor symptoms, and quetiapine is possibly efficacious with a low risk of worsening motor symptoms.¹⁵ Other antipsychotics, such as olanzapine, risperidone, and haloperidol, can substantially worsen motor symptoms.¹⁵ Both second-generation antipsychotics and pimavanserin have an FDA black-box warning for a higher risk of all-cause mortality in older patients with dementia; however, because psychosis is associated with early mortality in PD, the risk/benefit ratio should be discussed with the patient and family for shared decision-making.³⁰ If the patient also has dementia, rivastigmine—which is FDA-approved for PD dementia (PDD)—may also improve hallucinations.³²

CP02210014_f2.png

Cognitive disorders

This section focuses on PD mild cognitive impairment (PD-MCI) and PDD. When a patient with PD reports cognitive concerns, the approach outlined in Figure 3 can be used to diagnose the cognitive disorder. A detailed history, medication review, and physical examination can identify any medical or psychiatric conditions that could affect cognition. The American Academy of Neurology recommends screening for depression, obtaining blood levels of vitamin B12 and thyroid-stimulating hormone, and obtaining a CT or MRI of the brain to rule out reversible causes of dementia.³³ A validated screening test such as the Montreal Cognitive Assessment, which has higher sensitivity for PD-MCI than the Mini-Mental State Examination, is used to identify and quantify cognitive impairment.³⁴ Neuropsychological testing is the gold standard and can be used to confirm and/or better quantify the degree and domains of cognitive impairment.³⁵ Typically, cognitive deficits in PD affect executive function, attention, and/or visuospatial domains more than memory and language early on, and deficits in visuospatial and language domains have the highest sensitivity for predicting progression to PDD.³⁶

CP02210014_f3.png

Once reversible causes of dementia are addressed or ruled out and cognitive testing is completed, the Movement Disorder Society (MDS) criteria for PD-MCI and PDD summarized in Figure 3 can be used to diagnose the cognitive disorder.^37,38 The MDS criteria for PDD require a diagnosis of PD for ≥1 year prior to the onset of dementia to differentiate PDD from dementia with Lewy bodies (DLB). If the dementia starts within 1 year of the onset of parkinsonism, the diagnosis would be DLB. PDD and DLB are on the spectrum of Lewy body dementia, with the same Lewy body pathology in different temporal and spatial distributions in the brain.³⁸

Continue to: PD-MCI is present in...

PD-MCI is present in approximately 25% of patients.³⁵ PD-MCI does not always progress to dementia but increases the risk of dementia 6-fold. The prevalence of PDD increases with disease duration; it is present in approximately 50% of patients at 10 years and 80% of patients at 20 years of disease.³⁵ Rivastigmine is the only FDA-approved medication to slow progression of PDD. There is insufficient evidence for other acetylcholinesterase inhibitors and memantine.¹⁵ Unfortunately, RCTs of pharmacotherapy for PD-MCI have failed to show efficacy. However, exercise, cognitive rehabilitation, and neuromodulation are being studied. In the meantime, addressing modifiable risk factors (such as vascular risk factors and alcohol consumption) and treating comorbid orthostatic hypotension, obstructive sleep apnea, and depression may improve cognition.^35,39

Treatment-related disorders

Impulse control disorders

Impulse control disorders (ICDs) are an important medication-related consideration in patients with PD. The ICDs seen in PD include pathological gambling, binge eating, excessive shopping, hypersexual behaviors, and dopamine dysregulation syndrome (Table). These disorders are more common in younger patients with a history of impulsive personality traits and addictive behaviors (eg, history of tobacco or alcohol abuse), and are most strongly associated with dopaminergic therapies, particularly the dopamine agonists.^40,41 In the DOMINION study, the odds of ICDs were 2- to 3.5-fold higher in patients taking dopamine agonists.⁴² This is mainly thought to be due to stimulation of D2/D3 receptors in the mesolimbic system.⁴⁰ High doses of levodopa, monoamine oxidase inhibitors, and amantadine are also associated with ICDs.^40-42

CP02210014_t1.png

The first step in managing ICDs is diagnosing them, which can be difficult because patients often are not forthcoming about these problems due to embarrassment or failure to recognize that the ICD is related to PD medications. If a family member accompanies the patient at the visit, the patient may not want to disclose the amount of money they spend or the extent to which the behavior is a problem. Thus, a screening questionnaire, such as the Questionnaire for Impulsive-Compulsive Disorders in Parkinson’s Disease (QUIP) can be a helpful way for patients to alert the clinician to the issue.⁴¹ Education for the patient and family is crucial before the ICD causes significant financial, health, or relationship problems.

The mainstay of treatment is to reduce or taper off the dopamine agonist or other offending agent while monitoring for worsening motor symptoms and dopamine withdrawal syndrome. If this is unsuccessful, there is very limited evidence for further treatment strategies (Table), including antidepressants, antipsychotics, and mood stabilizers.^40,43,44 There is insufficient evidence for naltrexone based on an RCT that failed to meet its primary endpoint, although naltrexone did significantly reduce QUIP scores.^15,44 There is also insufficient evidence for amantadine, which showed benefit in some studies but was associated with ICDs in the DOMINION study.^15,40,42 In terms of nonpharmacologic treatments, CBT is likely efficacious.^15,40 There are mixed results for STN DBS. Some studies showed improvement in the ICD, due at least in part to dopaminergic medication reduction postoperatively, but this treatment has also been reported to increase impulsivity.^40,45

Deep brain stimulation–related disorders

For patients with PD, the ideal lead location for STN DBS is the dorsolateral aspect of the STN, as this is the motor region of the nucleus. The STN functions in indirect and hyperdirect pathways to put the brake on certain motor programs so only the desired movement can be executed. Its function is clinically demonstrated by patients with STN stroke who develop excessive ballistic movements. Adjacent to the motor region of the STN is a centrally located associative region and a medially located limbic region. Thus, when stimulating the dorsolateral STN, current can spread to those regions as well, and the STN’s ability to put the brake on behavioral and emotional programs can be affected.⁴⁶ Stimulation of the STN has been associated with mania, euphoria, new-onset ICDs, decreased verbal fluency, and executive dysfunction. Depression, apathy, and anxiety can also occur, but more commonly result from rapid withdrawal of antiparkinsonian medications after DBS surgery.^46,47 Therefore, for PD patients with DBS with new or worsening psychiatric or cognitive symptoms, it is important to inquire about any recent programming sessions with neurology as well as recent self-increases in stimulation by the patient using their controller. Collaboration with neurology is important to troubleshoot whether stimulation could be contributing to the patient’s psychiatric or cognitive symptoms.

Continue to: Bottom Line

Mood, anxiety, psychotic, and cognitive symptoms and disorders are common psychiatric manifestations associated with Parkinson’s disease (PD). In addition, patients with PD may experience impulsive control disorders and other symptoms related to treatments they receive for PD. Careful assessment and collaboration with neurology is crucial to alleviating the effects of these conditions.

Related Resources

• Weintraub D, Aarsland D, Chaudhuri KR, et al. The neuropsychiatry of Parkinson’s disease: advances and challenges. Lancet Neurology. 2022;21(1):89-102. doi:10.1016/S1474-4422(21)00330-6
• Goldman JG, Guerra CM. Treatment of nonmotor symptoms associated with Parkinson disease. Neurologic Clinics. 2020;38(2):269-292. doi:10.1016/j.ncl.2019.12.003
• Castrioto A, Lhommee E, Moro E et al. Mood and behavioral effects of subthalamic stimulation in Parkinson’s disease. Lancet Neurology. 2014;13(3):287-305. doi:10.1016/ S1474-4422(13)70294-1

Drug Brand Names

Amantadine • Gocovri
Carbidopa-levodopa • Sinemet
Clozapine • Clozaril
Haloperidol • Haldol
Memantine • Namenda
Mirtazapine • Remeron
Naltrexone • Vivitrol
Olanzapine • Zyprexa
Paroxetine • Paxil
Pimavanserin • Nuplazid
Piribedil • Pronoran
Pramipexole • Mirapex
Quetiapine • Seroquel
Rasagiline • Azilect
Risperidone • Risperdal
Rivastigmine • Exelon
Ropinirole • Requip
Rotigotine • Neupro
Venlafaxine • Effexor
Zonisamide • Zonegran

Parkinson’s disease (PD) is a neurodegenerative condition diagnosed pathologically by alpha synuclein–containing Lewy bodies and dopaminergic cell loss in the substantia nigra pars compacta of the midbrain. Loss of dopaminergic input to the caudate and putamen disrupts the direct and indirect basal ganglia pathways for motor control and contributes to the motor symptoms of PD.¹ According to the Movement Disorder Society criteria, PD is diagnosed clinically by bradykinesia (slowness of movement) plus resting tremor and/or rigidity in the presence of supportive criteria, such as levodopa responsiveness and hyposmia, and in the absence of exclusion criteria and red flags that would suggest atypical parkinsonism or an alternative diagnosis.²

Although the diagnosis and treatment of PD focus heavily on the motor symptoms, nonmotor symptoms can arise decades before the onset of motor symptoms and continue throughout the lifespan. Nonmotor symptoms affect patients from head (ie, cognition and mood) to toe (ie, striatal toe pain) and multiple organ systems in between, including the olfactory, integumentary, cardiovascular, gastrointestinal, genitourinary, and autonomic nervous systems. Thus, it is not surprising that nonmotor symptoms of PD impact health-related quality of life more substantially than motor symptoms.³ A helpful analogy is to consider the motor symptoms of PD as the tip of the iceberg and the nonmotor symptoms as the larger, submerged portions of the iceberg.⁴

Nonmotor symptoms can negatively impact the treatment of motor symptoms. For example, imagine a patient who is very rigid and dyscoordinated in the arms and legs, which limits their ability to dress and walk. If this patient also suffers from nonmotor symptoms of orthostatic hypotension and psychosis—both of which can be exacerbated by levodopa—dose escalation of levodopa for the rigidity and dyscoordination could be compromised, rendering the patient undertreated and less mobile.

In this review, we focus on identifying and managing nonmotor symptoms of PD that are relevant to psychiatric practice, including mood and motivational disorders, anxiety disorders, psychosis, cognitive disorders, and disorders related to the pharmacologic and surgical treatment of PD (Figure 1).

CP02210014_f1.png

Mood and motivational disorders

Depression

Depression is a common symptom in PD that can occur in the prodromal period years to decades before the onset of motor symptoms, as well as throughout the disease course.⁵ The prevalence of depression in PD varies from 3% to 90%, depending on the methods of assessment, clinical setting of assessment, motor symptom severity, and other factors; clinically significant depression likely affects approximately 35% to 38% of patients.^5,6 How depression in patients with PD differs from depression in the general population is not entirely understood, but there does seem to be less guilt and suicidal ideation and a substantial component of negative affect, including dysphoria and anxiety.⁷ Practically speaking, depression is treated similarly in PD and general populations, with a few considerations.

Despite limited randomized controlled trials (RCTs) for efficacy specifically in patients with PD, selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) are generally considered first-line treatments. There is also evidence for tricyclic antidepressants (TCAs), but due to potential worsening of orthostatic hypotension and cognition, TCAs may not be a favorable option for certain patients with PD.^8,9 All antidepressants have the potential to worsen tremor. Theoretically, SNRIs, with noradrenergic activity, may be less tolerable than SSRIs in patients with PD. However, worsening tremor generally has not been a clinically significant adverse event reported in PD depression clinical trials, although it was seen in 17% of patients receiving paroxetine and 21% of patients receiving venlafaxine compared to 7% of patients receiving placebo.^9-11 If tremor worsens, mirtazapine could be considered because it has been reported to cause less tremor than SSRIs or TCAs.¹²

Among medications for PD, pramipexole, a dopamine agonist, may have a beneficial effect on depression.¹³ Additionally, some evidence supports rasagiline, a monoamine oxidase type B inhibitor, as an adjunctive medication for depression in PD.¹⁴ Nevertheless, antidepressant medications remain the standard pharmacologic treatment for PD depression.

Continue to: In terms of nonpharmacologic options...

In terms of nonpharmacologic options, cognitive-behavioral therapy (CBT) is likely efficacious, exercise (especially yoga) is likely efficacious, and repetitive transcranial magnetic stimulation may be efficacious.^15,16 While further high-quality trials are needed, these treatments are low-risk and can be considered, especially for patients who cannot tolerate medications.

Apathy

Apathy—a loss of motivation and goal-directed behavior—can occur in up to 30% of patients during the prodromal period of PD, and in up to 70% of patients throughout the disease course.¹⁷ Apathy can coexist with depression, which can make apathy difficult to diagnose.¹⁷ Given the time constraints of a clinic visit, a practical approach would be to first screen for depression and cognitive impairment. If there is continued suspicion of apathy, the Movement Disorder Society-Sponsored Revision of the Unified Parkinson’s Disease Rating Scale part I question (“In the past week have you felt indifferent to doing activities or being with people?”) can be used to screen for apathy, and more detailed scales, such as the Apathy Scale (AS) or Lille Apathy Rating Scale (LARS), could be used if indicated.¹⁸

There are limited high-quality positive trials of apathy-specific treatments in PD. In an RCT of patients with PD who did not have depression or dementia, rivastigmine improved LARS scores compared to placebo.¹⁵ Piribedil, a D2/D3 receptor agonist, improved apathy in patients who underwent subthalamic nucleus deep brain stimulation (STN DBS).¹⁵ Exercise such as individualized physical therapy programs, dance, and Nordic walking as well as mindfulness interventions were shown to significantly reduce apathy scale scores.¹⁹ SSRIs, SNRIs, and rotigotine showed a trend toward reducing AS scores in RCTs.^10,20

Larger, high-quality studies are needed to clarify the treatment of apathy in PD. In the meantime, a reasonable approach is to first treat any comorbid psychiatric or cognitive disorders, since apathy can be associated with these conditions, and to optimize antiparkinsonian medications for motor symptoms, motor fluctuations, and nonmotor fluctuations. Then, the investigational apathy treatments described in this section could be considered on an individual basis.

Anxiety disorders

Anxiety is seen throughout the disease course of PD in approximately 30% to 50% of patients.²¹ It can manifest as generalized anxiety disorder, panic disorder, and other anxiety disorders. There are no high-quality RCTs of pharmacologic treatments of anxiety specifically in patients with PD, except for a negative safety and tolerability study of buspirone in which one-half of patients experienced worsening motor symptoms.^15,22 Thus, the treatment of anxiety in patients with PD is similar to treatments in the general population. SSRIs and SNRIs are typically considered first-line, benzodiazepines are sometimes used with caution (although cognitive adverse effects and fall risk need to be considered), and nonpharma­cologic treatments such as mindfulness yoga, exercise, CBT, and psycho­therapy can be effective.^16,21,23

Continue to: Because there is the lack...

Because there is the lack of evidence-based treatments for anxiety in PD, we highlight 2 PD-specific anxiety disorders: internal tremor, and nonmotor “off” anxiety.

Internal tremor

Internal tremor is a sense of vibration in the axial and/or appendicular muscles that cannot be seen externally by the patient or examiner. It is not yet fully understood if this phenomenon is sensory, anxiety-related, related to subclinical tremor, or the result of a combination of these factors (ie, sensory awareness of a subclinical tremor that triggers or is worsened by anxiety). There is some evidence for subclinical tremor on electromyography, but internal tremor does not respond to antiparkinsonian medications in 70% of patients.²⁴ More electrophysiological research is needed to clarify this phenomenon. Internal tremor has been associated with anxiety in 64% of patients and often improves with anxiolytic therapies.²⁴

Although poorly understood, internal tremor is a documented phenomenon in 33% to 44% of patients with PD, and in some cases, it may be an initial symptom that motivates a patient to seek medical attention for the first time.^24,25 Internal tremor has also been reported in patients with essential tremor and multiple sclerosis.²⁵ Therefore, physicians should be aware of internal tremor because this symptom could herald an underlying neurological disease.

Nonmotor ‘off’ anxiety

Patients with PD are commonly prescribed carbidopa-levodopa, a dopamine precursor, at least 3 times daily. Initially, this medication controls motor symptoms well from 1 dose to the next. However, as the disease progresses, some patients report motor fluctuations in which an individual dose of carbidopa-levodopa may wear off early, take longer than usual to take effect, or not take effect at all. Patients describe these periods as an “off” state in which they do not feel their medications are working. Such motor fluctuations can lead to anxiety and avoidance behaviors, because patients fear being in public at times when the medication does not adequately control their motor symptoms.

In addition to these motor symptom fluctuations and related anxiety, patients can also experience nonmotor symptom fluctuations. A wide variety of nonmotor symptoms, such as mood, cognitive, and behavioral symptoms, have been reported to fluctuate in parallel with motor symptoms.^26,27 One study reported fluctuating restlessness in 39% of patients with PD, excessive worry in 17%, shortness of breath in 13%, excessive sweating and fear in 12%, and palpitations in 10%.²⁷ A patient with fluctuating shortness of breath, sweating, and palpitations (for example) may repeatedly present to the emergency department with a negative cardiac workup and eventually be diagnosed with panic disorder, whereas the patient is truly experiencing nonmotor “off” symptoms. Thus, it is important to be aware of nonmotor fluctuations so this diagnosis can be made and the symptoms appropriately treated. The first step in treating nonmotor fluctuations is to optimize the antiparkinsonian regimen to minimize fluctuations. If “off” anxiety symptoms persist, anxiolytic medications can be prescribed.²¹

Continue to: Psychosis

Psychosis can occur in prodromal and early PD but is most common in advanced PD.²⁸ One study reported that 60% of patients developed hallucinations or delusions after 12 years of follow-up.²⁹ Disease duration, disease severity, dementia, and rapid eye movement sleep behavior disorder are significant risk factors for psychosis in PD.³⁰ Well-formed visual hallucinations are the most common manifestation of psychosis in patients with PD. Auditory hallucinations and delusions are less common. Delusions are usually seen in patients with dementia and are often paranoid delusions, such as of spousal infidelity.³⁰ Sensory hallucinations can occur, but should not be mistaken with formication, a central pain syndrome in PD that can represent a nonmotor “off” symptom that may respond to dopaminergic medication.³¹ Other more mild psychotic symptoms include illusions or misinterpretation of stimuli, false sense of presence, and passage hallucinations of fleeting figures in the peripheral vision.³⁰

The pathophysiology of PD psychosis is not entirely understood but differs from psychosis in other disorders. It can occur in the absence of antiparkinsonian medication exposure and is thought to be a consequence of the underlying disease process of PD involving neurodegeneration in certain brain regions and aberrant neurotransmission of not only dopamine but also serotonin, acetylcholine, and glutamate.³⁰

Figure 2 outlines the management of psychosis in PD. After addressing medical and medication-related causes, it is important to determine if the psychotic symptom is sufficiently bothersome to and/or potentially dangerous for the patient to warrant treatment. If treatment is indicated, pimavanserin and clozapine are efficacious for psychosis in PD without worsening motor symptoms, and quetiapine is possibly efficacious with a low risk of worsening motor symptoms.¹⁵ Other antipsychotics, such as olanzapine, risperidone, and haloperidol, can substantially worsen motor symptoms.¹⁵ Both second-generation antipsychotics and pimavanserin have an FDA black-box warning for a higher risk of all-cause mortality in older patients with dementia; however, because psychosis is associated with early mortality in PD, the risk/benefit ratio should be discussed with the patient and family for shared decision-making.³⁰ If the patient also has dementia, rivastigmine—which is FDA-approved for PD dementia (PDD)—may also improve hallucinations.³²

CP02210014_f2.png

Cognitive disorders

This section focuses on PD mild cognitive impairment (PD-MCI) and PDD. When a patient with PD reports cognitive concerns, the approach outlined in Figure 3 can be used to diagnose the cognitive disorder. A detailed history, medication review, and physical examination can identify any medical or psychiatric conditions that could affect cognition. The American Academy of Neurology recommends screening for depression, obtaining blood levels of vitamin B12 and thyroid-stimulating hormone, and obtaining a CT or MRI of the brain to rule out reversible causes of dementia.³³ A validated screening test such as the Montreal Cognitive Assessment, which has higher sensitivity for PD-MCI than the Mini-Mental State Examination, is used to identify and quantify cognitive impairment.³⁴ Neuropsychological testing is the gold standard and can be used to confirm and/or better quantify the degree and domains of cognitive impairment.³⁵ Typically, cognitive deficits in PD affect executive function, attention, and/or visuospatial domains more than memory and language early on, and deficits in visuospatial and language domains have the highest sensitivity for predicting progression to PDD.³⁶

CP02210014_f3.png

Once reversible causes of dementia are addressed or ruled out and cognitive testing is completed, the Movement Disorder Society (MDS) criteria for PD-MCI and PDD summarized in Figure 3 can be used to diagnose the cognitive disorder.^37,38 The MDS criteria for PDD require a diagnosis of PD for ≥1 year prior to the onset of dementia to differentiate PDD from dementia with Lewy bodies (DLB). If the dementia starts within 1 year of the onset of parkinsonism, the diagnosis would be DLB. PDD and DLB are on the spectrum of Lewy body dementia, with the same Lewy body pathology in different temporal and spatial distributions in the brain.³⁸

Continue to: PD-MCI is present in...

PD-MCI is present in approximately 25% of patients.³⁵ PD-MCI does not always progress to dementia but increases the risk of dementia 6-fold. The prevalence of PDD increases with disease duration; it is present in approximately 50% of patients at 10 years and 80% of patients at 20 years of disease.³⁵ Rivastigmine is the only FDA-approved medication to slow progression of PDD. There is insufficient evidence for other acetylcholinesterase inhibitors and memantine.¹⁵ Unfortunately, RCTs of pharmacotherapy for PD-MCI have failed to show efficacy. However, exercise, cognitive rehabilitation, and neuromodulation are being studied. In the meantime, addressing modifiable risk factors (such as vascular risk factors and alcohol consumption) and treating comorbid orthostatic hypotension, obstructive sleep apnea, and depression may improve cognition.^35,39

Treatment-related disorders

Impulse control disorders

Impulse control disorders (ICDs) are an important medication-related consideration in patients with PD. The ICDs seen in PD include pathological gambling, binge eating, excessive shopping, hypersexual behaviors, and dopamine dysregulation syndrome (Table). These disorders are more common in younger patients with a history of impulsive personality traits and addictive behaviors (eg, history of tobacco or alcohol abuse), and are most strongly associated with dopaminergic therapies, particularly the dopamine agonists.^40,41 In the DOMINION study, the odds of ICDs were 2- to 3.5-fold higher in patients taking dopamine agonists.⁴² This is mainly thought to be due to stimulation of D2/D3 receptors in the mesolimbic system.⁴⁰ High doses of levodopa, monoamine oxidase inhibitors, and amantadine are also associated with ICDs.^40-42

CP02210014_t1.png

The first step in managing ICDs is diagnosing them, which can be difficult because patients often are not forthcoming about these problems due to embarrassment or failure to recognize that the ICD is related to PD medications. If a family member accompanies the patient at the visit, the patient may not want to disclose the amount of money they spend or the extent to which the behavior is a problem. Thus, a screening questionnaire, such as the Questionnaire for Impulsive-Compulsive Disorders in Parkinson’s Disease (QUIP) can be a helpful way for patients to alert the clinician to the issue.⁴¹ Education for the patient and family is crucial before the ICD causes significant financial, health, or relationship problems.

The mainstay of treatment is to reduce or taper off the dopamine agonist or other offending agent while monitoring for worsening motor symptoms and dopamine withdrawal syndrome. If this is unsuccessful, there is very limited evidence for further treatment strategies (Table), including antidepressants, antipsychotics, and mood stabilizers.^40,43,44 There is insufficient evidence for naltrexone based on an RCT that failed to meet its primary endpoint, although naltrexone did significantly reduce QUIP scores.^15,44 There is also insufficient evidence for amantadine, which showed benefit in some studies but was associated with ICDs in the DOMINION study.^15,40,42 In terms of nonpharmacologic treatments, CBT is likely efficacious.^15,40 There are mixed results for STN DBS. Some studies showed improvement in the ICD, due at least in part to dopaminergic medication reduction postoperatively, but this treatment has also been reported to increase impulsivity.^40,45

Deep brain stimulation–related disorders

For patients with PD, the ideal lead location for STN DBS is the dorsolateral aspect of the STN, as this is the motor region of the nucleus. The STN functions in indirect and hyperdirect pathways to put the brake on certain motor programs so only the desired movement can be executed. Its function is clinically demonstrated by patients with STN stroke who develop excessive ballistic movements. Adjacent to the motor region of the STN is a centrally located associative region and a medially located limbic region. Thus, when stimulating the dorsolateral STN, current can spread to those regions as well, and the STN’s ability to put the brake on behavioral and emotional programs can be affected.⁴⁶ Stimulation of the STN has been associated with mania, euphoria, new-onset ICDs, decreased verbal fluency, and executive dysfunction. Depression, apathy, and anxiety can also occur, but more commonly result from rapid withdrawal of antiparkinsonian medications after DBS surgery.^46,47 Therefore, for PD patients with DBS with new or worsening psychiatric or cognitive symptoms, it is important to inquire about any recent programming sessions with neurology as well as recent self-increases in stimulation by the patient using their controller. Collaboration with neurology is important to troubleshoot whether stimulation could be contributing to the patient’s psychiatric or cognitive symptoms.

Continue to: Bottom Line

Mood, anxiety, psychotic, and cognitive symptoms and disorders are common psychiatric manifestations associated with Parkinson’s disease (PD). In addition, patients with PD may experience impulsive control disorders and other symptoms related to treatments they receive for PD. Careful assessment and collaboration with neurology is crucial to alleviating the effects of these conditions.

Related Resources

• Weintraub D, Aarsland D, Chaudhuri KR, et al. The neuropsychiatry of Parkinson’s disease: advances and challenges. Lancet Neurology. 2022;21(1):89-102. doi:10.1016/S1474-4422(21)00330-6
• Goldman JG, Guerra CM. Treatment of nonmotor symptoms associated with Parkinson disease. Neurologic Clinics. 2020;38(2):269-292. doi:10.1016/j.ncl.2019.12.003
• Castrioto A, Lhommee E, Moro E et al. Mood and behavioral effects of subthalamic stimulation in Parkinson’s disease. Lancet Neurology. 2014;13(3):287-305. doi:10.1016/ S1474-4422(13)70294-1

Drug Brand Names

Amantadine • Gocovri
Carbidopa-levodopa • Sinemet
Clozapine • Clozaril
Haloperidol • Haldol
Memantine • Namenda
Mirtazapine • Remeron
Naltrexone • Vivitrol
Olanzapine • Zyprexa
Paroxetine • Paxil
Pimavanserin • Nuplazid
Piribedil • Pronoran
Pramipexole • Mirapex
Quetiapine • Seroquel
Rasagiline • Azilect
Risperidone • Risperdal
Rivastigmine • Exelon
Ropinirole • Requip
Rotigotine • Neupro
Venlafaxine • Effexor
Zonisamide • Zonegran

TOPLINE:

Prevalence of sexual dysfunction in schizophrenia patients remains high, with improved screening and treatment of depression possibly improving sexual health of these patients, results of a systematic review and meta-analysis show.

METHODOLOGY:

• Data on sexual dysfunction prevalence in people with schizophrenia should be updated because the only meta-analysis on this topic was published over 10 years ago, and factors that could explain the heterogeneity of sexual dysfunctions in schizophrenia also need reexamining.
• After carrying out a literature search for observational studies reporting prevalence of sexual dysfunction in outpatients receiving treatment for schizophrenia or schizoaffective disorder, researchers included 72 studies with 21,076 patients from 33 countries published between 1979 and 2021 in their review.
• They determined pooled estimates of sexual dysfunction prevalence in men and women and of each specific dysfunction.

TAKEAWAY:

• Pooled estimates for global prevalence were: 56.4% for sexual dysfunctions (95% confidence interval, 50.5-62.2), 40.6% for loss of libido (95% CI, 30.7-51.4), 28.0% for orgasm dysfunction (95% CI, 18.4-40.2), and 6.1% for genital pain (95% CI, 2.8-12.7), with study design, sociodemographic data, and other factors associated with the high heterogeneity of sexual dysfunctions.
• In men, estimates were: 55.7% for sexual dysfunction (95% CI, 48.1-63.1), 44.0% for erectile dysfunction (95% CI, 33.5-55.2), and 38.6% ejaculation dysfunction (95% CI, 26.8-51.8).
• In women, estimates were: 60.0% for sexual dysfunction (95% CI, 48.0-70.8), 25.1% for amenorrhea (95% CI, 17.3-35.0), and 7.7% for galactorrhea (95% CI, 3.7-15.3).
• Studies with the highest proportion of antidepressant prescriptions reported lower rates of sexual dysfunctions.

IN PRACTICE:

The review shows that sexual dysfunction is “extremely frequent” in schizophrenia and uncovers “important evidence” suggesting that better screening and treatment of depression “may be an effective strategy to improve sexual health in patients with schizophrenia,” write the authors.

SOURCE:

The study was carried out by Théo Korchia, MD, Assistance Publique-Hopitaux de Marseille, Aix-Marseille University, CEReSS: Health Service Research and Quality of Life Center, France, and colleagues. It was published online in JAMA Psychiatry.

LIMITATIONS:

Most factors known to increase sexual dysfunction, including hypertension, diabetes, obesity, smoking, and sleep disorders, were poorly explored in the included studies. Results may not be extrapolated to continents such as Africa and Polynesia because they were underrepresented in the review. The presence of publication bias in the meta-analysis can’t be entirely ruled out. Heterogeneity or methodological differences may have contributed to the observed results.

DISCLOSURES:

The authors have no relevant conflict of interest.

A version of this article first appeared on Medscape.com.

TOPLINE:

Prevalence of sexual dysfunction in schizophrenia patients remains high, with improved screening and treatment of depression possibly improving sexual health of these patients, results of a systematic review and meta-analysis show.

METHODOLOGY:

• Data on sexual dysfunction prevalence in people with schizophrenia should be updated because the only meta-analysis on this topic was published over 10 years ago, and factors that could explain the heterogeneity of sexual dysfunctions in schizophrenia also need reexamining.
• After carrying out a literature search for observational studies reporting prevalence of sexual dysfunction in outpatients receiving treatment for schizophrenia or schizoaffective disorder, researchers included 72 studies with 21,076 patients from 33 countries published between 1979 and 2021 in their review.
• They determined pooled estimates of sexual dysfunction prevalence in men and women and of each specific dysfunction.

TAKEAWAY:

• Pooled estimates for global prevalence were: 56.4% for sexual dysfunctions (95% confidence interval, 50.5-62.2), 40.6% for loss of libido (95% CI, 30.7-51.4), 28.0% for orgasm dysfunction (95% CI, 18.4-40.2), and 6.1% for genital pain (95% CI, 2.8-12.7), with study design, sociodemographic data, and other factors associated with the high heterogeneity of sexual dysfunctions.
• In men, estimates were: 55.7% for sexual dysfunction (95% CI, 48.1-63.1), 44.0% for erectile dysfunction (95% CI, 33.5-55.2), and 38.6% ejaculation dysfunction (95% CI, 26.8-51.8).
• In women, estimates were: 60.0% for sexual dysfunction (95% CI, 48.0-70.8), 25.1% for amenorrhea (95% CI, 17.3-35.0), and 7.7% for galactorrhea (95% CI, 3.7-15.3).
• Studies with the highest proportion of antidepressant prescriptions reported lower rates of sexual dysfunctions.

IN PRACTICE:

The review shows that sexual dysfunction is “extremely frequent” in schizophrenia and uncovers “important evidence” suggesting that better screening and treatment of depression “may be an effective strategy to improve sexual health in patients with schizophrenia,” write the authors.

SOURCE:

The study was carried out by Théo Korchia, MD, Assistance Publique-Hopitaux de Marseille, Aix-Marseille University, CEReSS: Health Service Research and Quality of Life Center, France, and colleagues. It was published online in JAMA Psychiatry.

LIMITATIONS:

Most factors known to increase sexual dysfunction, including hypertension, diabetes, obesity, smoking, and sleep disorders, were poorly explored in the included studies. Results may not be extrapolated to continents such as Africa and Polynesia because they were underrepresented in the review. The presence of publication bias in the meta-analysis can’t be entirely ruled out. Heterogeneity or methodological differences may have contributed to the observed results.

DISCLOSURES:

The authors have no relevant conflict of interest.

A version of this article first appeared on Medscape.com.

TOPLINE:

Prevalence of sexual dysfunction in schizophrenia patients remains high, with improved screening and treatment of depression possibly improving sexual health of these patients, results of a systematic review and meta-analysis show.

METHODOLOGY:

• Data on sexual dysfunction prevalence in people with schizophrenia should be updated because the only meta-analysis on this topic was published over 10 years ago, and factors that could explain the heterogeneity of sexual dysfunctions in schizophrenia also need reexamining.
• After carrying out a literature search for observational studies reporting prevalence of sexual dysfunction in outpatients receiving treatment for schizophrenia or schizoaffective disorder, researchers included 72 studies with 21,076 patients from 33 countries published between 1979 and 2021 in their review.
• They determined pooled estimates of sexual dysfunction prevalence in men and women and of each specific dysfunction.

TAKEAWAY:

• Pooled estimates for global prevalence were: 56.4% for sexual dysfunctions (95% confidence interval, 50.5-62.2), 40.6% for loss of libido (95% CI, 30.7-51.4), 28.0% for orgasm dysfunction (95% CI, 18.4-40.2), and 6.1% for genital pain (95% CI, 2.8-12.7), with study design, sociodemographic data, and other factors associated with the high heterogeneity of sexual dysfunctions.
• In men, estimates were: 55.7% for sexual dysfunction (95% CI, 48.1-63.1), 44.0% for erectile dysfunction (95% CI, 33.5-55.2), and 38.6% ejaculation dysfunction (95% CI, 26.8-51.8).
• In women, estimates were: 60.0% for sexual dysfunction (95% CI, 48.0-70.8), 25.1% for amenorrhea (95% CI, 17.3-35.0), and 7.7% for galactorrhea (95% CI, 3.7-15.3).
• Studies with the highest proportion of antidepressant prescriptions reported lower rates of sexual dysfunctions.

IN PRACTICE:

The review shows that sexual dysfunction is “extremely frequent” in schizophrenia and uncovers “important evidence” suggesting that better screening and treatment of depression “may be an effective strategy to improve sexual health in patients with schizophrenia,” write the authors.

SOURCE:

The study was carried out by Théo Korchia, MD, Assistance Publique-Hopitaux de Marseille, Aix-Marseille University, CEReSS: Health Service Research and Quality of Life Center, France, and colleagues. It was published online in JAMA Psychiatry.

LIMITATIONS:

Most factors known to increase sexual dysfunction, including hypertension, diabetes, obesity, smoking, and sleep disorders, were poorly explored in the included studies. Results may not be extrapolated to continents such as Africa and Polynesia because they were underrepresented in the review. The presence of publication bias in the meta-analysis can’t be entirely ruled out. Heterogeneity or methodological differences may have contributed to the observed results.

DISCLOSURES:

The authors have no relevant conflict of interest.

A version of this article first appeared on Medscape.com.

David Nichols, PhD, a leading expert in the field of psychedelic research and the founding president of the Heffter Research Institute, often answers the question, “What is a psychedelic?” by saying, “The scientific definition I always use is that they are substances that produce changes in thought, mood, and affect, which only occur during dreaming or religious exaltation.”^1,2 However, this definition does not account for the experiences of naturally occurring psychoses, such as those seen in schizophrenia.

Khetsuriani_Lasha_NY_web.jpg

The phenomenology of psychotic experiences between drug-induced and naturally occurring psychoses differs, and the use of psychedelics does not necessarily replicate or simulate the symptoms of schizophrenia. For example, drug induced hallucinations are often described as more intense and vivid, while those associated with schizophrenia are described as more persistent and distressing.³

An altered state of consciousness is a hallmark of a psychedelic trip, but not a characteristic of schizophrenia. Patients with schizophrenia who have used psychedelics typically report that their experiences under the influence of these drugs are distinct from their usual experiences with the condition. Additionally, according to many experts, the underlying neurobiological mechanisms are different, with psychedelics affecting serotonin receptors and schizophrenia thought to be linked more to dopamine dysregulation, among other factors.

However, there are some instances of naturally occurring psychoses that are difficult to distinguish from the experiences reported by those who take psychedelics. This article explores the similarities between psychedelic experiences induced by serotonergic psychedelics, 5-HT2A agonists, such as LSD, psilocybin, and mescaline, and a rare psychiatric disorder known as the “oneiroid state.”
 

Origins and definitions

The term “oneiroia” is derived from the Greek words for “sleep” and “similar,” referring to the dreamlike character of the condition. It is widely acknowledged that psychedelics can temporarily induce dreamlike states,⁴ but this article focuses specifically on the naturally occurring, endogenous dreamlike state.

Oneiroid state was first described by German psychiatrist Wilhelm Mayer-Gross in the early 20th century and was once well-known among European psychiatrists. Some classified it as a part of schizophrenia, others saw it as an unusual manifestation of affective disorder, and still others considered it an atypical psychosis. Nevertheless, this phenomenon has received limited attention in American psychiatric journals.

The key characteristic of this condition is a distinctive state of consciousness marked by vivid and florid hallucinations, and a succession of constantly shifting dreamlike or surrealistic visuals and imagery often similar to mystical or cosmic experiences. Self-awareness and orientation in time and place are often disturbed, and delusions are experienced within this altered state.⁵

To gain a better understanding of the oneiroid state, it may be helpful to turn to European or other schools of psychiatry with a history of studying this phenomenon, as American psychiatry has limited knowledge in this area.

As described in the “Handbook of Psychiatry” by Russian psychiatrist A.V. Snezhnevsky, published in 1983, oneiroid state, also known as oneiroid syndrome, is a dreamlike and imaginative state characterized by a bizarre combination of reality and vivid phantasmagoric imaginations.⁶ In this state, individuals are completely detached from their surroundings and experience a change in self-awareness, often displaying either a lack of movement or senseless excitement.

Patients often experience the oneiroid state as active participants, as if they are in a movie theater, not only watching the story, but also being part of it, reacting to it with either “external immobility” or senseless excitement, completely detached from their surroundings. This is similar to the portrayal of the emotions of the characters in Steven Spielberg’s film “Ready Player One.”

The entry in Dr. Snezhnevsky’s “Handbook” states: “Some patients in Oneiroid State experience travels to other worlds, such as interacting with inhabitants on Mars, collecting gems on the moon, exploring invisible cities, participating in conspiracies and insurrections, fighting with pirates, chasing The Flying Dutchman, wandering through ancient Rome, and even visiting heaven or hell. At times, the patient’s imagination reaches a state of mystical contemplation.”⁶

In contrast to delirium, which never impairs self-awareness, oneiroid state is marked by drastic changes in the sense of self. The memory of the subjective experience during the oneiroia is much more vivid and consistent than in delirium. Patients who have experienced the oneiroid state often have complete recall of their experience, as if they have just woken up from a dream.

It was commonly thought that oneiroid state was part of the group of functional psychoses, rather than organic psychoses, and was not considered to be a result of mind-altering psychedelics. It was not considered a manifestation of epilepsy either. Oneiroid state could last for weeks or even months, making it unlikely to be related to an epileptic seizure. Furthermore, EEG results did not show any seizurelike activity during the state.

An excellent case study on oneiroid state was published in Israel in 2000. The authors described two patients who experienced the oneiroid state for several days or even weeks.⁷ One of the patients reported that during the illness, he experienced himself aboard a spaceship as a cosmonaut, heading for a different universe. On another occasion, the patient perceived himself as a person living 2,000 years ago and being guilty of Christ’s death.

The second patient reported that everything around her appeared “like in the movies,” and she saw others as characters from comic strips. Both patients alternated between catatonic excitement and sluggishness and would sometimes come back to reality for a few minutes to respond to questions. Physical exams, laboratory tests, neurological tests, and a brain scan were all normal in both cases.
 

Conclusions

As mentioned earlier, oneiroid state is not widely discussed in American psychiatric journals and is now considered a rare condition globally, despite being a common occurrence in the past century. A diagnosis similar to oneiroid state, known as bouffée délirante, is still in use in some French-speaking countries, with a noticeable decline in frequency.^2,8 The widespread acceptance of international classification systems such as the ICD-10, which does not recognize the diagnosis, is likely one of the reasons for this decline.

However, the decrease in the prevalence of the oneiroid state is not unique, as other forms of mental illness, such as the catatonic subtype of schizophrenia, are also becoming less prevalent. The cause of this decline is uncertain. Could changes in the way mental disorders affect 5HT2A receptors be a contributing factor?

In conclusion, as the field of psychedelic research experiences a resurgence, this little-known manifestation of mental illness, oneiroid state, may be worth reexamining.

With the expected approval and regulation of psilocybin and MDMA by the FDA, and classical psychedelics widely regarded as nonaddictive and safer than other recreational drugs, the phenomenological similarity between the naturally occurring impaired consciousness of the oneiroid state and the altered states of consciousness brought about by entheogenic substances should be seen as a possibility for enhanced understanding, rather than as a cause for concern.

Dr. Khetsuriani is a supervising psychiatrist at the Bronx Psychiatric Center in Bronx, N.Y., and has a private psychiatric practice located in Manhattan, N.Y.

References

1. Nichols DE. Keynote address, 39th Telluride Mushroom Festival, Aug. 15-18, 2019. https://www.youtube.com/watch?v=RlDCM5JQzRk.

2. Nichols DE. Psychedelics. Pharmacol Rev. 2016 Apr;68(2):264-355. doi: 10.1124/pr.115.011478.

3. Leptourgos P et al. Hallucinations Under Psychedelics and in the Schizophrenia Spectrum: An Interdisciplinary and Multiscale Comparison. Schizophr Bull. 2020 Dec 1;46(6):1396-1408. doi: 10.1093/schbul/sbaa117.

4. Kraehenmann R. Dreams and Psychedelics: Neurophenomenological Comparison and Therapeutic Implications. Curr Neuropharmacol. 2017;15(7):1032-42. doi: 10.2174/1573413713666170619092629.

5. Henri EY et al. “Acute Delusional Psychosis” in Hirsch SR and Shepherd M, eds. Themes and variations in European psychiatry: An anthology. Charlottesville: University Press of Virginia, 1974.

6. Snezhnevsky A, ed. Handbook of Psychiatry. Moscow: Meditsina, 1983.

7. Kaptsan A et al. Oneiroid syndrome: A concept of use for Western psychiatry. Isr J Psychiatry Relat Sci. 2000;37(4):278-85.

8. https://en.wikipedia.org/wiki/Bouff%C3%A9e_d%C3%A9lirante.

David Nichols, PhD, a leading expert in the field of psychedelic research and the founding president of the Heffter Research Institute, often answers the question, “What is a psychedelic?” by saying, “The scientific definition I always use is that they are substances that produce changes in thought, mood, and affect, which only occur during dreaming or religious exaltation.”^1,2 However, this definition does not account for the experiences of naturally occurring psychoses, such as those seen in schizophrenia.

Khetsuriani_Lasha_NY_web.jpg

The phenomenology of psychotic experiences between drug-induced and naturally occurring psychoses differs, and the use of psychedelics does not necessarily replicate or simulate the symptoms of schizophrenia. For example, drug induced hallucinations are often described as more intense and vivid, while those associated with schizophrenia are described as more persistent and distressing.³

An altered state of consciousness is a hallmark of a psychedelic trip, but not a characteristic of schizophrenia. Patients with schizophrenia who have used psychedelics typically report that their experiences under the influence of these drugs are distinct from their usual experiences with the condition. Additionally, according to many experts, the underlying neurobiological mechanisms are different, with psychedelics affecting serotonin receptors and schizophrenia thought to be linked more to dopamine dysregulation, among other factors.

However, there are some instances of naturally occurring psychoses that are difficult to distinguish from the experiences reported by those who take psychedelics. This article explores the similarities between psychedelic experiences induced by serotonergic psychedelics, 5-HT2A agonists, such as LSD, psilocybin, and mescaline, and a rare psychiatric disorder known as the “oneiroid state.”
 

Origins and definitions

The term “oneiroia” is derived from the Greek words for “sleep” and “similar,” referring to the dreamlike character of the condition. It is widely acknowledged that psychedelics can temporarily induce dreamlike states,⁴ but this article focuses specifically on the naturally occurring, endogenous dreamlike state.

Oneiroid state was first described by German psychiatrist Wilhelm Mayer-Gross in the early 20th century and was once well-known among European psychiatrists. Some classified it as a part of schizophrenia, others saw it as an unusual manifestation of affective disorder, and still others considered it an atypical psychosis. Nevertheless, this phenomenon has received limited attention in American psychiatric journals.

The key characteristic of this condition is a distinctive state of consciousness marked by vivid and florid hallucinations, and a succession of constantly shifting dreamlike or surrealistic visuals and imagery often similar to mystical or cosmic experiences. Self-awareness and orientation in time and place are often disturbed, and delusions are experienced within this altered state.⁵

To gain a better understanding of the oneiroid state, it may be helpful to turn to European or other schools of psychiatry with a history of studying this phenomenon, as American psychiatry has limited knowledge in this area.

As described in the “Handbook of Psychiatry” by Russian psychiatrist A.V. Snezhnevsky, published in 1983, oneiroid state, also known as oneiroid syndrome, is a dreamlike and imaginative state characterized by a bizarre combination of reality and vivid phantasmagoric imaginations.⁶ In this state, individuals are completely detached from their surroundings and experience a change in self-awareness, often displaying either a lack of movement or senseless excitement.

Patients often experience the oneiroid state as active participants, as if they are in a movie theater, not only watching the story, but also being part of it, reacting to it with either “external immobility” or senseless excitement, completely detached from their surroundings. This is similar to the portrayal of the emotions of the characters in Steven Spielberg’s film “Ready Player One.”

The entry in Dr. Snezhnevsky’s “Handbook” states: “Some patients in Oneiroid State experience travels to other worlds, such as interacting with inhabitants on Mars, collecting gems on the moon, exploring invisible cities, participating in conspiracies and insurrections, fighting with pirates, chasing The Flying Dutchman, wandering through ancient Rome, and even visiting heaven or hell. At times, the patient’s imagination reaches a state of mystical contemplation.”⁶

In contrast to delirium, which never impairs self-awareness, oneiroid state is marked by drastic changes in the sense of self. The memory of the subjective experience during the oneiroia is much more vivid and consistent than in delirium. Patients who have experienced the oneiroid state often have complete recall of their experience, as if they have just woken up from a dream.

It was commonly thought that oneiroid state was part of the group of functional psychoses, rather than organic psychoses, and was not considered to be a result of mind-altering psychedelics. It was not considered a manifestation of epilepsy either. Oneiroid state could last for weeks or even months, making it unlikely to be related to an epileptic seizure. Furthermore, EEG results did not show any seizurelike activity during the state.

An excellent case study on oneiroid state was published in Israel in 2000. The authors described two patients who experienced the oneiroid state for several days or even weeks.⁷ One of the patients reported that during the illness, he experienced himself aboard a spaceship as a cosmonaut, heading for a different universe. On another occasion, the patient perceived himself as a person living 2,000 years ago and being guilty of Christ’s death.

The second patient reported that everything around her appeared “like in the movies,” and she saw others as characters from comic strips. Both patients alternated between catatonic excitement and sluggishness and would sometimes come back to reality for a few minutes to respond to questions. Physical exams, laboratory tests, neurological tests, and a brain scan were all normal in both cases.
 

Conclusions

As mentioned earlier, oneiroid state is not widely discussed in American psychiatric journals and is now considered a rare condition globally, despite being a common occurrence in the past century. A diagnosis similar to oneiroid state, known as bouffée délirante, is still in use in some French-speaking countries, with a noticeable decline in frequency.^2,8 The widespread acceptance of international classification systems such as the ICD-10, which does not recognize the diagnosis, is likely one of the reasons for this decline.

However, the decrease in the prevalence of the oneiroid state is not unique, as other forms of mental illness, such as the catatonic subtype of schizophrenia, are also becoming less prevalent. The cause of this decline is uncertain. Could changes in the way mental disorders affect 5HT2A receptors be a contributing factor?

In conclusion, as the field of psychedelic research experiences a resurgence, this little-known manifestation of mental illness, oneiroid state, may be worth reexamining.

With the expected approval and regulation of psilocybin and MDMA by the FDA, and classical psychedelics widely regarded as nonaddictive and safer than other recreational drugs, the phenomenological similarity between the naturally occurring impaired consciousness of the oneiroid state and the altered states of consciousness brought about by entheogenic substances should be seen as a possibility for enhanced understanding, rather than as a cause for concern.

Dr. Khetsuriani is a supervising psychiatrist at the Bronx Psychiatric Center in Bronx, N.Y., and has a private psychiatric practice located in Manhattan, N.Y.

References

1. Nichols DE. Keynote address, 39th Telluride Mushroom Festival, Aug. 15-18, 2019. https://www.youtube.com/watch?v=RlDCM5JQzRk.

2. Nichols DE. Psychedelics. Pharmacol Rev. 2016 Apr;68(2):264-355. doi: 10.1124/pr.115.011478.

3. Leptourgos P et al. Hallucinations Under Psychedelics and in the Schizophrenia Spectrum: An Interdisciplinary and Multiscale Comparison. Schizophr Bull. 2020 Dec 1;46(6):1396-1408. doi: 10.1093/schbul/sbaa117.

4. Kraehenmann R. Dreams and Psychedelics: Neurophenomenological Comparison and Therapeutic Implications. Curr Neuropharmacol. 2017;15(7):1032-42. doi: 10.2174/1573413713666170619092629.

5. Henri EY et al. “Acute Delusional Psychosis” in Hirsch SR and Shepherd M, eds. Themes and variations in European psychiatry: An anthology. Charlottesville: University Press of Virginia, 1974.

6. Snezhnevsky A, ed. Handbook of Psychiatry. Moscow: Meditsina, 1983.

7. Kaptsan A et al. Oneiroid syndrome: A concept of use for Western psychiatry. Isr J Psychiatry Relat Sci. 2000;37(4):278-85.

8. https://en.wikipedia.org/wiki/Bouff%C3%A9e_d%C3%A9lirante.

David Nichols, PhD, a leading expert in the field of psychedelic research and the founding president of the Heffter Research Institute, often answers the question, “What is a psychedelic?” by saying, “The scientific definition I always use is that they are substances that produce changes in thought, mood, and affect, which only occur during dreaming or religious exaltation.”^1,2 However, this definition does not account for the experiences of naturally occurring psychoses, such as those seen in schizophrenia.

Khetsuriani_Lasha_NY_web.jpg

The phenomenology of psychotic experiences between drug-induced and naturally occurring psychoses differs, and the use of psychedelics does not necessarily replicate or simulate the symptoms of schizophrenia. For example, drug induced hallucinations are often described as more intense and vivid, while those associated with schizophrenia are described as more persistent and distressing.³

An altered state of consciousness is a hallmark of a psychedelic trip, but not a characteristic of schizophrenia. Patients with schizophrenia who have used psychedelics typically report that their experiences under the influence of these drugs are distinct from their usual experiences with the condition. Additionally, according to many experts, the underlying neurobiological mechanisms are different, with psychedelics affecting serotonin receptors and schizophrenia thought to be linked more to dopamine dysregulation, among other factors.

However, there are some instances of naturally occurring psychoses that are difficult to distinguish from the experiences reported by those who take psychedelics. This article explores the similarities between psychedelic experiences induced by serotonergic psychedelics, 5-HT2A agonists, such as LSD, psilocybin, and mescaline, and a rare psychiatric disorder known as the “oneiroid state.”
 

Origins and definitions

The term “oneiroia” is derived from the Greek words for “sleep” and “similar,” referring to the dreamlike character of the condition. It is widely acknowledged that psychedelics can temporarily induce dreamlike states,⁴ but this article focuses specifically on the naturally occurring, endogenous dreamlike state.

Oneiroid state was first described by German psychiatrist Wilhelm Mayer-Gross in the early 20th century and was once well-known among European psychiatrists. Some classified it as a part of schizophrenia, others saw it as an unusual manifestation of affective disorder, and still others considered it an atypical psychosis. Nevertheless, this phenomenon has received limited attention in American psychiatric journals.

The key characteristic of this condition is a distinctive state of consciousness marked by vivid and florid hallucinations, and a succession of constantly shifting dreamlike or surrealistic visuals and imagery often similar to mystical or cosmic experiences. Self-awareness and orientation in time and place are often disturbed, and delusions are experienced within this altered state.⁵

To gain a better understanding of the oneiroid state, it may be helpful to turn to European or other schools of psychiatry with a history of studying this phenomenon, as American psychiatry has limited knowledge in this area.

As described in the “Handbook of Psychiatry” by Russian psychiatrist A.V. Snezhnevsky, published in 1983, oneiroid state, also known as oneiroid syndrome, is a dreamlike and imaginative state characterized by a bizarre combination of reality and vivid phantasmagoric imaginations.⁶ In this state, individuals are completely detached from their surroundings and experience a change in self-awareness, often displaying either a lack of movement or senseless excitement.

Patients often experience the oneiroid state as active participants, as if they are in a movie theater, not only watching the story, but also being part of it, reacting to it with either “external immobility” or senseless excitement, completely detached from their surroundings. This is similar to the portrayal of the emotions of the characters in Steven Spielberg’s film “Ready Player One.”

The entry in Dr. Snezhnevsky’s “Handbook” states: “Some patients in Oneiroid State experience travels to other worlds, such as interacting with inhabitants on Mars, collecting gems on the moon, exploring invisible cities, participating in conspiracies and insurrections, fighting with pirates, chasing The Flying Dutchman, wandering through ancient Rome, and even visiting heaven or hell. At times, the patient’s imagination reaches a state of mystical contemplation.”⁶

In contrast to delirium, which never impairs self-awareness, oneiroid state is marked by drastic changes in the sense of self. The memory of the subjective experience during the oneiroia is much more vivid and consistent than in delirium. Patients who have experienced the oneiroid state often have complete recall of their experience, as if they have just woken up from a dream.

It was commonly thought that oneiroid state was part of the group of functional psychoses, rather than organic psychoses, and was not considered to be a result of mind-altering psychedelics. It was not considered a manifestation of epilepsy either. Oneiroid state could last for weeks or even months, making it unlikely to be related to an epileptic seizure. Furthermore, EEG results did not show any seizurelike activity during the state.

An excellent case study on oneiroid state was published in Israel in 2000. The authors described two patients who experienced the oneiroid state for several days or even weeks.⁷ One of the patients reported that during the illness, he experienced himself aboard a spaceship as a cosmonaut, heading for a different universe. On another occasion, the patient perceived himself as a person living 2,000 years ago and being guilty of Christ’s death.

The second patient reported that everything around her appeared “like in the movies,” and she saw others as characters from comic strips. Both patients alternated between catatonic excitement and sluggishness and would sometimes come back to reality for a few minutes to respond to questions. Physical exams, laboratory tests, neurological tests, and a brain scan were all normal in both cases.
 

Conclusions

As mentioned earlier, oneiroid state is not widely discussed in American psychiatric journals and is now considered a rare condition globally, despite being a common occurrence in the past century. A diagnosis similar to oneiroid state, known as bouffée délirante, is still in use in some French-speaking countries, with a noticeable decline in frequency.^2,8 The widespread acceptance of international classification systems such as the ICD-10, which does not recognize the diagnosis, is likely one of the reasons for this decline.

However, the decrease in the prevalence of the oneiroid state is not unique, as other forms of mental illness, such as the catatonic subtype of schizophrenia, are also becoming less prevalent. The cause of this decline is uncertain. Could changes in the way mental disorders affect 5HT2A receptors be a contributing factor?

In conclusion, as the field of psychedelic research experiences a resurgence, this little-known manifestation of mental illness, oneiroid state, may be worth reexamining.

With the expected approval and regulation of psilocybin and MDMA by the FDA, and classical psychedelics widely regarded as nonaddictive and safer than other recreational drugs, the phenomenological similarity between the naturally occurring impaired consciousness of the oneiroid state and the altered states of consciousness brought about by entheogenic substances should be seen as a possibility for enhanced understanding, rather than as a cause for concern.

Dr. Khetsuriani is a supervising psychiatrist at the Bronx Psychiatric Center in Bronx, N.Y., and has a private psychiatric practice located in Manhattan, N.Y.

References

1. Nichols DE. Keynote address, 39th Telluride Mushroom Festival, Aug. 15-18, 2019. https://www.youtube.com/watch?v=RlDCM5JQzRk.

2. Nichols DE. Psychedelics. Pharmacol Rev. 2016 Apr;68(2):264-355. doi: 10.1124/pr.115.011478.

3. Leptourgos P et al. Hallucinations Under Psychedelics and in the Schizophrenia Spectrum: An Interdisciplinary and Multiscale Comparison. Schizophr Bull. 2020 Dec 1;46(6):1396-1408. doi: 10.1093/schbul/sbaa117.

4. Kraehenmann R. Dreams and Psychedelics: Neurophenomenological Comparison and Therapeutic Implications. Curr Neuropharmacol. 2017;15(7):1032-42. doi: 10.2174/1573413713666170619092629.

5. Henri EY et al. “Acute Delusional Psychosis” in Hirsch SR and Shepherd M, eds. Themes and variations in European psychiatry: An anthology. Charlottesville: University Press of Virginia, 1974.

6. Snezhnevsky A, ed. Handbook of Psychiatry. Moscow: Meditsina, 1983.

7. Kaptsan A et al. Oneiroid syndrome: A concept of use for Western psychiatry. Isr J Psychiatry Relat Sci. 2000;37(4):278-85.

8. https://en.wikipedia.org/wiki/Bouff%C3%A9e_d%C3%A9lirante.

Suicide is not a trivial matter – it upends families, robs partners of a loved one, prevents children from having a parent, and can destroy a parent’s most cherished being. It is not surprising that societies have repeatedly made it a goal to study and reduce suicide within their populations.

The suicide rate in the United States is trending upward, from about 10 per 100,000 in 2000 to about 15 per 100,000 in more recent reports. The increasing suicide rates have been accompanied by increasing distress among many strata of society. From a public health level, analysts are not just witnessing increasing suicide rates, but a shocking rise in all “deaths of despair,”¹ among which suicide can be considered the ultimate example.

NicoBadre_Calif.jpeg_web.jpg

On an individual level, many know someone who has died of suicide or suffered from a serious suicide attempt. From the public health level to the individual level, advocacy has called for various interventions in the field of psychiatry to remedy this tragic problem.

Psychiatrists have been firsthand witnesses to this increasing demand for suicide interventions. When in residency, the norm was to perform a suicide risk assessment at the time of admission to the hospital and again at the time of discharge. As the years passed, the new normal within psychiatric hospitals has shifted to asking about suicidality on a daily basis.

In what seems to us like an escalating arms race, the emerging standard of care at many facilities is now not only for daily suicide risk assessments by each psychiatrist, but also to require nurses to ask about suicidality during every 8-hour shift – in addition to documented inquiries about suicidality by other allied staff on the psychiatric unit. As a result, it is not uncommon for a patient hospitalized at an academic center to receive more than half a dozen suicide risk assessments in a day (first by the medical student, at least once – often more than once – by the resident, again by the attending psychiatrist, then the social worker and three nurses in 24 hours).

Compton_Jason_CALIF_web.jpg

One of the concerns about such an approach is the lack of logic inherent to many risk assessment tools and symptom scales. Many of us are familiar with the Patient Health Questionnaire (PHQ-9) to assess depression.² The PHQ-9 asks to consider “over the last 2 weeks, how often have you ...” in relation to nine symptoms associated with depression. It has always defied reason to perform a PHQ-9 every day and expect the answers to change from “nearly every day” to “not at all,” considering only 1 day has passed since the last time the patient has answered the questions. Yet daily, or near daily, PHQ-9 scores are a frequently used tool of tracking symptom improvement in response to treatments, such as electroconvulsive therapy, performed multiple times a week.

One can argue that the patient’s perspective on how symptomatic he or she has been over the past 2 weeks may change rapidly with alleviation of a depressed mood. However, the PHQ-9 is both reported to be, and often regarded as, an objective score. If one wishes to utilize it as such, the defense of its use should not be that it is a subjective report with just as much utility as “Rate your depression on a scale of 0-27.”

Similarly, many suicide scales were intended to assess thoughts of suicide in the past month³ or have been re-tooled to address this particular concern by asking “since the last contact.”⁴ It is baffling to see a chart with many dozens of suicide risk assessments with at times widely differing answers, yet all measuring thoughts of suicide in the past month. Is one to expect the answer to “How many times have you had these thoughts [of suicide ideation]? (1) Less than once a week (2) Once a week ...” to change between 8 a.m. and noon? Furthermore, for the purpose of assessing acute risk of suicidality in the immediate future, to only consider symptoms since the last contact – or past 2 weeks, past month, etc. – is of unclear significance.
 

Provider liability

Another concern is the liability placed on providers. A common problem encountered in the inpatient setting is insurance companies refusing to reimburse a hospital stay for depressed patients denying suicidality.

Any provider in the position of caring for such a patient must ask: What is the likelihood of someone providing a false negative – a false denial of suicidality? Is the likelihood of a suicidal person denying suicidality different if asked 5 or 10 or more times in a day? There are innumerable instances where a patient at a very high risk of self-harm has denied suicidality, been discharged from the hospital, and suffered terrible consequences. Ethically, the psychiatrist aware of this risk is no more at ease discharging these patients, whether it is one suicide risk scale or a dozen that suggests a patient is at low risk.

Alternatively, it may feel untenable from a medicolegal perspective for a psychiatrist to discharge a patient denying suicidality when the chart includes over a dozen previously documented elevated suicide risk assessments in the past 72 hours. By placing the job of suicide risk assessment in the hands of providers of varying levels of training and responsibility, a situation is created in which the seasoned psychiatrist who would otherwise be comfortable discharging a patient feels unable to do so because every other note-writer in the record – from the triage nurse to the medical assistant to the sitter in the emergency department – has recorded the patient as high risk for suicide. When put in such a position, the thought often occurs that systems of care, rather than individual providers, are protected most by ever escalating requirements for suicide risk documentation. To make a clinical decision contrary to the body of suicide risk documentation puts the provider at risk of being scapegoated by the system of care, which can point to its illogical and ineffective, though profusely documented, suicide prevention protocols.
 

Limitations of risk assessments

Considering the ongoing rise in the use of suicide risk assessments, one would expect that the evidence for their efficacy was robust and well established. Yet a thorough review of suicide risk assessments funded by the MacArthur Foundation, which examined decades of research, came to disheartening conclusions: “predictive ability has not improved over the past 50 years”; “no risk factor category or subcategory is substantially stronger than any other”; and “predicting solely according to base rates may be comparable to prediction with current risk factors.”⁵

Those findings were consistent with the conclusions of many other studies, which have summarized the utility of suicide risk assessments as follows: “occurrence of suicide is too low to identify those individuals who are likely to die by suicide”;⁶ “suicide prediction models produce accurate overall classification models, but their accuracy of predicting a future event is near zero”;⁷ “risk stratification is too inaccurate to be clinically useful and might even be harmful”;⁸ “suicide risk prediction [lacks] any items or information that to a useful degree permit the identification of persons who will complete suicide”;⁹ “existing suicide prediction tools have little current clinical value”;¹⁰ “our current preoccupation with risk assessment has ... created a mythology with no evidence to support it.”¹¹ And that’s to cite just a few.

Sadly, we have known about the limitations of suicide risk assessments for many decades. In 1983 a large VA prospective study, which aimed to identify veterans who will die by suicide, examined 4,800 patients with a wide range of instruments and measures.¹² This study concluded that “discriminant analysis was clearly inadequate in correctly classifying the subjects. For an event as rare as suicide, our predictive tools and guides are simply not equal to the task.” The authors described the feelings of many in stating “courts and public opinion expect physicians to be able to pick out the particular persons who will later commit suicide. Although we may reconstruct causal chains and motives, we do not possess the tools to predict suicides.”

Yet, even several decades prior, in 1954, Dr. Albert Rosen performed an elegant statistical analysis and predicted that, considering the low base rate of suicide, suicide risk assessments are “of no practical value, for it would be impossible to treat the prodigious number of false positives.”¹³ It seems that we continue to be unable to accept Dr. Rosen’s premonition despite decades of confirmatory evidence.
 

“Quantity over quality”

Regardless of those sobering reports, the field of psychiatry is seemingly doubling down on efforts to predict and prevent suicide deaths, and the way it is doing so has very questionable validity.

One can reasonably argue that the periodic performance of a suicide risk assessment may have clinical utility in reminding us of modifiable risk factors such as intoxication, social isolation, and access to lethal means. One can also reasonably argue that these risk assessments may provide useful education to patients and their families on epidemiological risk factors such as gender, age, and marital status. But our pursuit of serial suicide risk assessments throughout the day is encouraging providers to focus on a particular risk factor that changes from moment to moment and has particularly low validity, that being self-reported suicidality.

Reported suicidality is one of the few risk factors that can change from shift to shift. But 80% of people who die by suicide had not previously expressed suicidality, and 98.3% of people who have endorsed suicidality do not die by suicide.¹⁴ While the former statistic may improve with increased assessment, the later will likely worsen.

Suicide is not a trivial matter. We admire those that study it and advocate for better interventions. We have compassion for those who have suffered the loss of a loved one to suicide. Our patients have died as a result of the human limitations surrounding suicide prevention. Recognizing the weight of suicide and making an effort to avoid minimizing its immense consequences drive our desire to be honest with ourselves, our patients and their families, and society. That includes the unfortunate truth regarding the current state of the evidence and our ability to enact change.

It is our concern that the rising fascination with repeated suicide risk assessment is misguided in its current form and serves the purpose of appeasing administrators more than reflecting a scientific understanding of the literature. More sadly, we are concerned that this “quantity-over-quality” approach is yet another barrier to practicing what may be one of the few interventions with any hope of meaningfully impacting a patient’s risk of suicide in the clinical setting – spending time connecting with our patients.

Dr. Badre is a clinical and forensic psychiatrist in San Diego. He holds teaching positions at the University of California, San Diego, and the University of San Diego. He teaches medical education, psychopharmacology, ethics in psychiatry, and correctional care. Dr. Badre can be reached at his website, BadreMD.com. Dr. Compton is a member of the psychiatry faculty at University of California, San Diego. His background includes medical education, mental health advocacy, work with underserved populations, and brain cancer research. Dr. Badre and Dr. Compton have no conflicts of interest.

References

1. Joint Economic Committee. (2019). Long Term Trends in Deaths of Despair. SCP Report 4-19.

2. Kroenke K and Spitzer RL. The PHQ-9: A new depression diagnostic and severity measure. Psychiatr Ann. 2013;32(9):509-15. doi: 10.3928/0048-5713-20020901-06.

3. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Lifetime/Recent.

4. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Since Last Contact.

5. Franklin JC et al. Risk factors for suicidal thoughts and behaviors: A meta-analysis of 50 years of research. Psychol Bull. 2017 Feb;143(2):187-232. doi: 10.1037/bul0000084.

6. Beautrais AL. Further suicidal behavior among medically serious suicide attempters. Suicide Life Threat Behav. 2004 Spring;34(1):1-11. doi: 10.1521/suli.34.1.1.27772.

7. Belsher BE. Prediction models for suicide attempts and deaths: A systematic review and simulation. JAMA Psychiatry. 2019 Jun 1;76(6):642-651. doi: 10.1001/jamapsychiatry.2019.0174.

8. Carter G et al. Royal Australian and New Zealand College of Psychiatrists clinical practice guideline for the management of deliberate self-harm. Aust N Z J Psychiatry. 2016 Oct;50(10):939-1000. doi: 10.1177/0004867416661039.

9. Fosse R et al. Predictors of suicide in the patient population admitted to a locked-door psychiatric acute ward. PLoS One. 2017 Mar 16;12(3):e0173958. doi: 10.1371/journal.pone.0173958.

10. Kessler RC et al. Suicide prediction models: A critical review of recent research with recommendations for the way forward. Mol Psychiatry. 2020 Jan;25(1):168-79. doi: 10.1038/s41380-019-0531-0.

11. Mulder R. Problems with suicide risk assessment. Aust N Z J Psychiatry. 2011 Aug;45(8):605-7. doi: 10.3109/00048674.2011.594786.

12. Pokorny AD. Prediction of suicide in psychiatric patients: Report of a prospective study. Arch Gen Psychiatry. 1983 Mar;40(3):249-57. doi: 10.1001/archpsyc.1983.01790030019002.

13. Rosen A. Detection of suicidal patients: An example of some limitations in the prediction of infrequent events. J Consult Psychol. 1954 Dec;18(6):397-403. doi: 10.1037/h0058579.

14. McHugh CM et al. (2019). Association between suicidal ideation and suicide: Meta-analyses of odds ratios, sensitivity, specificity and positive predictive value. BJPsych Open. 2019 Mar;5(2):e18. doi: 10.1192/bjo.2018.88.

Suicide is not a trivial matter – it upends families, robs partners of a loved one, prevents children from having a parent, and can destroy a parent’s most cherished being. It is not surprising that societies have repeatedly made it a goal to study and reduce suicide within their populations.

The suicide rate in the United States is trending upward, from about 10 per 100,000 in 2000 to about 15 per 100,000 in more recent reports. The increasing suicide rates have been accompanied by increasing distress among many strata of society. From a public health level, analysts are not just witnessing increasing suicide rates, but a shocking rise in all “deaths of despair,”¹ among which suicide can be considered the ultimate example.

NicoBadre_Calif.jpeg_web.jpg

On an individual level, many know someone who has died of suicide or suffered from a serious suicide attempt. From the public health level to the individual level, advocacy has called for various interventions in the field of psychiatry to remedy this tragic problem.

Psychiatrists have been firsthand witnesses to this increasing demand for suicide interventions. When in residency, the norm was to perform a suicide risk assessment at the time of admission to the hospital and again at the time of discharge. As the years passed, the new normal within psychiatric hospitals has shifted to asking about suicidality on a daily basis.

In what seems to us like an escalating arms race, the emerging standard of care at many facilities is now not only for daily suicide risk assessments by each psychiatrist, but also to require nurses to ask about suicidality during every 8-hour shift – in addition to documented inquiries about suicidality by other allied staff on the psychiatric unit. As a result, it is not uncommon for a patient hospitalized at an academic center to receive more than half a dozen suicide risk assessments in a day (first by the medical student, at least once – often more than once – by the resident, again by the attending psychiatrist, then the social worker and three nurses in 24 hours).

Compton_Jason_CALIF_web.jpg

One of the concerns about such an approach is the lack of logic inherent to many risk assessment tools and symptom scales. Many of us are familiar with the Patient Health Questionnaire (PHQ-9) to assess depression.² The PHQ-9 asks to consider “over the last 2 weeks, how often have you ...” in relation to nine symptoms associated with depression. It has always defied reason to perform a PHQ-9 every day and expect the answers to change from “nearly every day” to “not at all,” considering only 1 day has passed since the last time the patient has answered the questions. Yet daily, or near daily, PHQ-9 scores are a frequently used tool of tracking symptom improvement in response to treatments, such as electroconvulsive therapy, performed multiple times a week.

One can argue that the patient’s perspective on how symptomatic he or she has been over the past 2 weeks may change rapidly with alleviation of a depressed mood. However, the PHQ-9 is both reported to be, and often regarded as, an objective score. If one wishes to utilize it as such, the defense of its use should not be that it is a subjective report with just as much utility as “Rate your depression on a scale of 0-27.”

Similarly, many suicide scales were intended to assess thoughts of suicide in the past month³ or have been re-tooled to address this particular concern by asking “since the last contact.”⁴ It is baffling to see a chart with many dozens of suicide risk assessments with at times widely differing answers, yet all measuring thoughts of suicide in the past month. Is one to expect the answer to “How many times have you had these thoughts [of suicide ideation]? (1) Less than once a week (2) Once a week ...” to change between 8 a.m. and noon? Furthermore, for the purpose of assessing acute risk of suicidality in the immediate future, to only consider symptoms since the last contact – or past 2 weeks, past month, etc. – is of unclear significance.
 

Provider liability

Another concern is the liability placed on providers. A common problem encountered in the inpatient setting is insurance companies refusing to reimburse a hospital stay for depressed patients denying suicidality.

Any provider in the position of caring for such a patient must ask: What is the likelihood of someone providing a false negative – a false denial of suicidality? Is the likelihood of a suicidal person denying suicidality different if asked 5 or 10 or more times in a day? There are innumerable instances where a patient at a very high risk of self-harm has denied suicidality, been discharged from the hospital, and suffered terrible consequences. Ethically, the psychiatrist aware of this risk is no more at ease discharging these patients, whether it is one suicide risk scale or a dozen that suggests a patient is at low risk.

Alternatively, it may feel untenable from a medicolegal perspective for a psychiatrist to discharge a patient denying suicidality when the chart includes over a dozen previously documented elevated suicide risk assessments in the past 72 hours. By placing the job of suicide risk assessment in the hands of providers of varying levels of training and responsibility, a situation is created in which the seasoned psychiatrist who would otherwise be comfortable discharging a patient feels unable to do so because every other note-writer in the record – from the triage nurse to the medical assistant to the sitter in the emergency department – has recorded the patient as high risk for suicide. When put in such a position, the thought often occurs that systems of care, rather than individual providers, are protected most by ever escalating requirements for suicide risk documentation. To make a clinical decision contrary to the body of suicide risk documentation puts the provider at risk of being scapegoated by the system of care, which can point to its illogical and ineffective, though profusely documented, suicide prevention protocols.
 

Limitations of risk assessments

Considering the ongoing rise in the use of suicide risk assessments, one would expect that the evidence for their efficacy was robust and well established. Yet a thorough review of suicide risk assessments funded by the MacArthur Foundation, which examined decades of research, came to disheartening conclusions: “predictive ability has not improved over the past 50 years”; “no risk factor category or subcategory is substantially stronger than any other”; and “predicting solely according to base rates may be comparable to prediction with current risk factors.”⁵

Those findings were consistent with the conclusions of many other studies, which have summarized the utility of suicide risk assessments as follows: “occurrence of suicide is too low to identify those individuals who are likely to die by suicide”;⁶ “suicide prediction models produce accurate overall classification models, but their accuracy of predicting a future event is near zero”;⁷ “risk stratification is too inaccurate to be clinically useful and might even be harmful”;⁸ “suicide risk prediction [lacks] any items or information that to a useful degree permit the identification of persons who will complete suicide”;⁹ “existing suicide prediction tools have little current clinical value”;¹⁰ “our current preoccupation with risk assessment has ... created a mythology with no evidence to support it.”¹¹ And that’s to cite just a few.

Sadly, we have known about the limitations of suicide risk assessments for many decades. In 1983 a large VA prospective study, which aimed to identify veterans who will die by suicide, examined 4,800 patients with a wide range of instruments and measures.¹² This study concluded that “discriminant analysis was clearly inadequate in correctly classifying the subjects. For an event as rare as suicide, our predictive tools and guides are simply not equal to the task.” The authors described the feelings of many in stating “courts and public opinion expect physicians to be able to pick out the particular persons who will later commit suicide. Although we may reconstruct causal chains and motives, we do not possess the tools to predict suicides.”

Yet, even several decades prior, in 1954, Dr. Albert Rosen performed an elegant statistical analysis and predicted that, considering the low base rate of suicide, suicide risk assessments are “of no practical value, for it would be impossible to treat the prodigious number of false positives.”¹³ It seems that we continue to be unable to accept Dr. Rosen’s premonition despite decades of confirmatory evidence.
 

“Quantity over quality”

Regardless of those sobering reports, the field of psychiatry is seemingly doubling down on efforts to predict and prevent suicide deaths, and the way it is doing so has very questionable validity.

One can reasonably argue that the periodic performance of a suicide risk assessment may have clinical utility in reminding us of modifiable risk factors such as intoxication, social isolation, and access to lethal means. One can also reasonably argue that these risk assessments may provide useful education to patients and their families on epidemiological risk factors such as gender, age, and marital status. But our pursuit of serial suicide risk assessments throughout the day is encouraging providers to focus on a particular risk factor that changes from moment to moment and has particularly low validity, that being self-reported suicidality.

Reported suicidality is one of the few risk factors that can change from shift to shift. But 80% of people who die by suicide had not previously expressed suicidality, and 98.3% of people who have endorsed suicidality do not die by suicide.¹⁴ While the former statistic may improve with increased assessment, the later will likely worsen.

Suicide is not a trivial matter. We admire those that study it and advocate for better interventions. We have compassion for those who have suffered the loss of a loved one to suicide. Our patients have died as a result of the human limitations surrounding suicide prevention. Recognizing the weight of suicide and making an effort to avoid minimizing its immense consequences drive our desire to be honest with ourselves, our patients and their families, and society. That includes the unfortunate truth regarding the current state of the evidence and our ability to enact change.

It is our concern that the rising fascination with repeated suicide risk assessment is misguided in its current form and serves the purpose of appeasing administrators more than reflecting a scientific understanding of the literature. More sadly, we are concerned that this “quantity-over-quality” approach is yet another barrier to practicing what may be one of the few interventions with any hope of meaningfully impacting a patient’s risk of suicide in the clinical setting – spending time connecting with our patients.

Dr. Badre is a clinical and forensic psychiatrist in San Diego. He holds teaching positions at the University of California, San Diego, and the University of San Diego. He teaches medical education, psychopharmacology, ethics in psychiatry, and correctional care. Dr. Badre can be reached at his website, BadreMD.com. Dr. Compton is a member of the psychiatry faculty at University of California, San Diego. His background includes medical education, mental health advocacy, work with underserved populations, and brain cancer research. Dr. Badre and Dr. Compton have no conflicts of interest.

References

1. Joint Economic Committee. (2019). Long Term Trends in Deaths of Despair. SCP Report 4-19.

2. Kroenke K and Spitzer RL. The PHQ-9: A new depression diagnostic and severity measure. Psychiatr Ann. 2013;32(9):509-15. doi: 10.3928/0048-5713-20020901-06.

3. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Lifetime/Recent.

4. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Since Last Contact.

5. Franklin JC et al. Risk factors for suicidal thoughts and behaviors: A meta-analysis of 50 years of research. Psychol Bull. 2017 Feb;143(2):187-232. doi: 10.1037/bul0000084.

6. Beautrais AL. Further suicidal behavior among medically serious suicide attempters. Suicide Life Threat Behav. 2004 Spring;34(1):1-11. doi: 10.1521/suli.34.1.1.27772.

7. Belsher BE. Prediction models for suicide attempts and deaths: A systematic review and simulation. JAMA Psychiatry. 2019 Jun 1;76(6):642-651. doi: 10.1001/jamapsychiatry.2019.0174.

8. Carter G et al. Royal Australian and New Zealand College of Psychiatrists clinical practice guideline for the management of deliberate self-harm. Aust N Z J Psychiatry. 2016 Oct;50(10):939-1000. doi: 10.1177/0004867416661039.

9. Fosse R et al. Predictors of suicide in the patient population admitted to a locked-door psychiatric acute ward. PLoS One. 2017 Mar 16;12(3):e0173958. doi: 10.1371/journal.pone.0173958.

10. Kessler RC et al. Suicide prediction models: A critical review of recent research with recommendations for the way forward. Mol Psychiatry. 2020 Jan;25(1):168-79. doi: 10.1038/s41380-019-0531-0.

11. Mulder R. Problems with suicide risk assessment. Aust N Z J Psychiatry. 2011 Aug;45(8):605-7. doi: 10.3109/00048674.2011.594786.

12. Pokorny AD. Prediction of suicide in psychiatric patients: Report of a prospective study. Arch Gen Psychiatry. 1983 Mar;40(3):249-57. doi: 10.1001/archpsyc.1983.01790030019002.

13. Rosen A. Detection of suicidal patients: An example of some limitations in the prediction of infrequent events. J Consult Psychol. 1954 Dec;18(6):397-403. doi: 10.1037/h0058579.

14. McHugh CM et al. (2019). Association between suicidal ideation and suicide: Meta-analyses of odds ratios, sensitivity, specificity and positive predictive value. BJPsych Open. 2019 Mar;5(2):e18. doi: 10.1192/bjo.2018.88.

Suicide is not a trivial matter – it upends families, robs partners of a loved one, prevents children from having a parent, and can destroy a parent’s most cherished being. It is not surprising that societies have repeatedly made it a goal to study and reduce suicide within their populations.

The suicide rate in the United States is trending upward, from about 10 per 100,000 in 2000 to about 15 per 100,000 in more recent reports. The increasing suicide rates have been accompanied by increasing distress among many strata of society. From a public health level, analysts are not just witnessing increasing suicide rates, but a shocking rise in all “deaths of despair,”¹ among which suicide can be considered the ultimate example.

NicoBadre_Calif.jpeg_web.jpg

On an individual level, many know someone who has died of suicide or suffered from a serious suicide attempt. From the public health level to the individual level, advocacy has called for various interventions in the field of psychiatry to remedy this tragic problem.

Psychiatrists have been firsthand witnesses to this increasing demand for suicide interventions. When in residency, the norm was to perform a suicide risk assessment at the time of admission to the hospital and again at the time of discharge. As the years passed, the new normal within psychiatric hospitals has shifted to asking about suicidality on a daily basis.

In what seems to us like an escalating arms race, the emerging standard of care at many facilities is now not only for daily suicide risk assessments by each psychiatrist, but also to require nurses to ask about suicidality during every 8-hour shift – in addition to documented inquiries about suicidality by other allied staff on the psychiatric unit. As a result, it is not uncommon for a patient hospitalized at an academic center to receive more than half a dozen suicide risk assessments in a day (first by the medical student, at least once – often more than once – by the resident, again by the attending psychiatrist, then the social worker and three nurses in 24 hours).

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One of the concerns about such an approach is the lack of logic inherent to many risk assessment tools and symptom scales. Many of us are familiar with the Patient Health Questionnaire (PHQ-9) to assess depression.² The PHQ-9 asks to consider “over the last 2 weeks, how often have you ...” in relation to nine symptoms associated with depression. It has always defied reason to perform a PHQ-9 every day and expect the answers to change from “nearly every day” to “not at all,” considering only 1 day has passed since the last time the patient has answered the questions. Yet daily, or near daily, PHQ-9 scores are a frequently used tool of tracking symptom improvement in response to treatments, such as electroconvulsive therapy, performed multiple times a week.

One can argue that the patient’s perspective on how symptomatic he or she has been over the past 2 weeks may change rapidly with alleviation of a depressed mood. However, the PHQ-9 is both reported to be, and often regarded as, an objective score. If one wishes to utilize it as such, the defense of its use should not be that it is a subjective report with just as much utility as “Rate your depression on a scale of 0-27.”

Similarly, many suicide scales were intended to assess thoughts of suicide in the past month³ or have been re-tooled to address this particular concern by asking “since the last contact.”⁴ It is baffling to see a chart with many dozens of suicide risk assessments with at times widely differing answers, yet all measuring thoughts of suicide in the past month. Is one to expect the answer to “How many times have you had these thoughts [of suicide ideation]? (1) Less than once a week (2) Once a week ...” to change between 8 a.m. and noon? Furthermore, for the purpose of assessing acute risk of suicidality in the immediate future, to only consider symptoms since the last contact – or past 2 weeks, past month, etc. – is of unclear significance.
 

Provider liability

Another concern is the liability placed on providers. A common problem encountered in the inpatient setting is insurance companies refusing to reimburse a hospital stay for depressed patients denying suicidality.

Any provider in the position of caring for such a patient must ask: What is the likelihood of someone providing a false negative – a false denial of suicidality? Is the likelihood of a suicidal person denying suicidality different if asked 5 or 10 or more times in a day? There are innumerable instances where a patient at a very high risk of self-harm has denied suicidality, been discharged from the hospital, and suffered terrible consequences. Ethically, the psychiatrist aware of this risk is no more at ease discharging these patients, whether it is one suicide risk scale or a dozen that suggests a patient is at low risk.

Alternatively, it may feel untenable from a medicolegal perspective for a psychiatrist to discharge a patient denying suicidality when the chart includes over a dozen previously documented elevated suicide risk assessments in the past 72 hours. By placing the job of suicide risk assessment in the hands of providers of varying levels of training and responsibility, a situation is created in which the seasoned psychiatrist who would otherwise be comfortable discharging a patient feels unable to do so because every other note-writer in the record – from the triage nurse to the medical assistant to the sitter in the emergency department – has recorded the patient as high risk for suicide. When put in such a position, the thought often occurs that systems of care, rather than individual providers, are protected most by ever escalating requirements for suicide risk documentation. To make a clinical decision contrary to the body of suicide risk documentation puts the provider at risk of being scapegoated by the system of care, which can point to its illogical and ineffective, though profusely documented, suicide prevention protocols.
 

Limitations of risk assessments

Considering the ongoing rise in the use of suicide risk assessments, one would expect that the evidence for their efficacy was robust and well established. Yet a thorough review of suicide risk assessments funded by the MacArthur Foundation, which examined decades of research, came to disheartening conclusions: “predictive ability has not improved over the past 50 years”; “no risk factor category or subcategory is substantially stronger than any other”; and “predicting solely according to base rates may be comparable to prediction with current risk factors.”⁵

Those findings were consistent with the conclusions of many other studies, which have summarized the utility of suicide risk assessments as follows: “occurrence of suicide is too low to identify those individuals who are likely to die by suicide”;⁶ “suicide prediction models produce accurate overall classification models, but their accuracy of predicting a future event is near zero”;⁷ “risk stratification is too inaccurate to be clinically useful and might even be harmful”;⁸ “suicide risk prediction [lacks] any items or information that to a useful degree permit the identification of persons who will complete suicide”;⁹ “existing suicide prediction tools have little current clinical value”;¹⁰ “our current preoccupation with risk assessment has ... created a mythology with no evidence to support it.”¹¹ And that’s to cite just a few.

Sadly, we have known about the limitations of suicide risk assessments for many decades. In 1983 a large VA prospective study, which aimed to identify veterans who will die by suicide, examined 4,800 patients with a wide range of instruments and measures.¹² This study concluded that “discriminant analysis was clearly inadequate in correctly classifying the subjects. For an event as rare as suicide, our predictive tools and guides are simply not equal to the task.” The authors described the feelings of many in stating “courts and public opinion expect physicians to be able to pick out the particular persons who will later commit suicide. Although we may reconstruct causal chains and motives, we do not possess the tools to predict suicides.”

Yet, even several decades prior, in 1954, Dr. Albert Rosen performed an elegant statistical analysis and predicted that, considering the low base rate of suicide, suicide risk assessments are “of no practical value, for it would be impossible to treat the prodigious number of false positives.”¹³ It seems that we continue to be unable to accept Dr. Rosen’s premonition despite decades of confirmatory evidence.
 

“Quantity over quality”

Regardless of those sobering reports, the field of psychiatry is seemingly doubling down on efforts to predict and prevent suicide deaths, and the way it is doing so has very questionable validity.

One can reasonably argue that the periodic performance of a suicide risk assessment may have clinical utility in reminding us of modifiable risk factors such as intoxication, social isolation, and access to lethal means. One can also reasonably argue that these risk assessments may provide useful education to patients and their families on epidemiological risk factors such as gender, age, and marital status. But our pursuit of serial suicide risk assessments throughout the day is encouraging providers to focus on a particular risk factor that changes from moment to moment and has particularly low validity, that being self-reported suicidality.

Reported suicidality is one of the few risk factors that can change from shift to shift. But 80% of people who die by suicide had not previously expressed suicidality, and 98.3% of people who have endorsed suicidality do not die by suicide.¹⁴ While the former statistic may improve with increased assessment, the later will likely worsen.

Suicide is not a trivial matter. We admire those that study it and advocate for better interventions. We have compassion for those who have suffered the loss of a loved one to suicide. Our patients have died as a result of the human limitations surrounding suicide prevention. Recognizing the weight of suicide and making an effort to avoid minimizing its immense consequences drive our desire to be honest with ourselves, our patients and their families, and society. That includes the unfortunate truth regarding the current state of the evidence and our ability to enact change.

It is our concern that the rising fascination with repeated suicide risk assessment is misguided in its current form and serves the purpose of appeasing administrators more than reflecting a scientific understanding of the literature. More sadly, we are concerned that this “quantity-over-quality” approach is yet another barrier to practicing what may be one of the few interventions with any hope of meaningfully impacting a patient’s risk of suicide in the clinical setting – spending time connecting with our patients.

Dr. Badre is a clinical and forensic psychiatrist in San Diego. He holds teaching positions at the University of California, San Diego, and the University of San Diego. He teaches medical education, psychopharmacology, ethics in psychiatry, and correctional care. Dr. Badre can be reached at his website, BadreMD.com. Dr. Compton is a member of the psychiatry faculty at University of California, San Diego. His background includes medical education, mental health advocacy, work with underserved populations, and brain cancer research. Dr. Badre and Dr. Compton have no conflicts of interest.

References

1. Joint Economic Committee. (2019). Long Term Trends in Deaths of Despair. SCP Report 4-19.

2. Kroenke K and Spitzer RL. The PHQ-9: A new depression diagnostic and severity measure. Psychiatr Ann. 2013;32(9):509-15. doi: 10.3928/0048-5713-20020901-06.

3. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Lifetime/Recent.

4. Columbia-Suicide Severity Rating Scale (C-SSRS) Full Since Last Contact.

5. Franklin JC et al. Risk factors for suicidal thoughts and behaviors: A meta-analysis of 50 years of research. Psychol Bull. 2017 Feb;143(2):187-232. doi: 10.1037/bul0000084.

6. Beautrais AL. Further suicidal behavior among medically serious suicide attempters. Suicide Life Threat Behav. 2004 Spring;34(1):1-11. doi: 10.1521/suli.34.1.1.27772.

7. Belsher BE. Prediction models for suicide attempts and deaths: A systematic review and simulation. JAMA Psychiatry. 2019 Jun 1;76(6):642-651. doi: 10.1001/jamapsychiatry.2019.0174.

8. Carter G et al. Royal Australian and New Zealand College of Psychiatrists clinical practice guideline for the management of deliberate self-harm. Aust N Z J Psychiatry. 2016 Oct;50(10):939-1000. doi: 10.1177/0004867416661039.

9. Fosse R et al. Predictors of suicide in the patient population admitted to a locked-door psychiatric acute ward. PLoS One. 2017 Mar 16;12(3):e0173958. doi: 10.1371/journal.pone.0173958.

10. Kessler RC et al. Suicide prediction models: A critical review of recent research with recommendations for the way forward. Mol Psychiatry. 2020 Jan;25(1):168-79. doi: 10.1038/s41380-019-0531-0.

11. Mulder R. Problems with suicide risk assessment. Aust N Z J Psychiatry. 2011 Aug;45(8):605-7. doi: 10.3109/00048674.2011.594786.

12. Pokorny AD. Prediction of suicide in psychiatric patients: Report of a prospective study. Arch Gen Psychiatry. 1983 Mar;40(3):249-57. doi: 10.1001/archpsyc.1983.01790030019002.

13. Rosen A. Detection of suicidal patients: An example of some limitations in the prediction of infrequent events. J Consult Psychol. 1954 Dec;18(6):397-403. doi: 10.1037/h0058579.

14. McHugh CM et al. (2019). Association between suicidal ideation and suicide: Meta-analyses of odds ratios, sensitivity, specificity and positive predictive value. BJPsych Open. 2019 Mar;5(2):e18. doi: 10.1192/bjo.2018.88.

A large brain imaging study of adults with six different psychiatric illnesses shows that heterogeneity in regional gray matter volume deviations is a general feature of psychiatric illness, but that these regionally heterogeneous areas are often embedded within common functional circuits and networks.

The findings suggest that “targeting brain circuits, rather than specific brain regions, may be a more effective way of developing new treatments,” study investigator Ashlea Segal said in an email.

The findings also suggest that it’s “unlikely that a single cause or mechanism of a given disorder exists, and that a ‘one-size-fits-all’ approach to treatment is likely only appropriate for a small subset of individuals. In fact, one size doesn’t fit all. It probably doesn’t even fit most,” said Ms. Segal, a PhD candidate with the Turner Institute for Brain and Mental Health’s Neural Systems and Behaviour Lab at Monash University in Melbourne.

“Focusing on brain alterations at an individual level allows us to develop more personally tailored treatments,” Ms. Segal added.

Regional heterogeneity, the authors write, “thus offers a plausible explanation for the well-described clinical heterogeneity observed in psychiatric disorders, while circuit- and network-level aggregation of deviations is a putative neural substrate for phenotypic similarities between patients assigned the same diagnosis.”

The study was published online in Nature Neuroscience
 

Beyond group averages

For decades, researchers have mapped brain areas showing reduced gray matter volume (GMV) in people diagnosed with a variety of mental illnesses, but these maps have only been generated at the level of group averages, Ms. Segal explained.

“This means that we understand how the brains of people with, say, schizophrenia, differ from those without schizophrenia on average, but we can’t really say much about individual people,” Ms. Segal said.

For their study, the researchers used new statistical techniques developed by Andre Marquand, PhD, who co-led the project, to characterize the heterogeneity of GMV differences in 1,294 individuals diagnosed with one of six psychiatric conditions and 1,465 matched controls. Dr. Marquand is affiliated with the Donders Institute for Brain, Cognition, and Behavior in Nijmegen, the Netherlands.

These techniques “allow us to benchmark the size of over 1,000 different brain regions in any given person relative to what we should expect to see in the general population. In this way, we can identify, for any person, brain regions showing unusually small or large volumes, given that person’s age and sex,” Ms. Segal told this news organization.

The clinical sample included 202 individuals with autism spectrum disorder, 153 with attention-deficit/hyperactivity disorder (ADHD), 228 with bipolar disorder, 161 with major depressive disorder, 167 with obsessive-compulsive disorder, and 383 individuals with schizophrenia.

Confirming earlier findings, those with psychiatric illness showed more GMV deviations than healthy controls, the researchers found.

However, at the individual level, deviations from population expectations for regional gray matter volumes were “highly heterogeneous,” affecting the same area in less than 7% of people with the same diagnosis, they note. “This result means that it is difficult to pinpoint treatment targets or causal mechanisms by focusing on group averages alone,” Alex Fornito, PhD, of Monash University, who led the research team, said in a statement.

“It may also explain why people with the same diagnosis show wide variability in their symptom profiles and treatment outcomes,” Dr. Fornito added.

Yet, despite considerable heterogeneity at the regional level across different diagnoses, these deviations were embedded within common functional circuits and networks in up to 56% of cases. 

The salience-ventral attention network, for example, which plays a central role in cognitive control, interoceptive awareness, and switching between internally and externally focused attention, was implicated across diagnoses, with other neural networks selectively involved in depression, bipolar disorder, schizophrenia, and ADHD.

The researchers say the approach they developed opens new opportunities for mapping brain changes in mental illness.

“The framework we have developed allows us to understand the diversity of brain changes in people with mental illness at different levels, from individual regions through to more widespread brain circuits and networks, offering a deeper insight into how the brain is affected in individual people,” Dr. Fornito said in a statement.

The study had no commercial funding. Ms. Segal, Dr. Fornito, and Dr. Marquand report no relevant financial relationships.

A version of this article first appeared on Medscape.com.

A large brain imaging study of adults with six different psychiatric illnesses shows that heterogeneity in regional gray matter volume deviations is a general feature of psychiatric illness, but that these regionally heterogeneous areas are often embedded within common functional circuits and networks.

The findings suggest that “targeting brain circuits, rather than specific brain regions, may be a more effective way of developing new treatments,” study investigator Ashlea Segal said in an email.

The findings also suggest that it’s “unlikely that a single cause or mechanism of a given disorder exists, and that a ‘one-size-fits-all’ approach to treatment is likely only appropriate for a small subset of individuals. In fact, one size doesn’t fit all. It probably doesn’t even fit most,” said Ms. Segal, a PhD candidate with the Turner Institute for Brain and Mental Health’s Neural Systems and Behaviour Lab at Monash University in Melbourne.

“Focusing on brain alterations at an individual level allows us to develop more personally tailored treatments,” Ms. Segal added.

Regional heterogeneity, the authors write, “thus offers a plausible explanation for the well-described clinical heterogeneity observed in psychiatric disorders, while circuit- and network-level aggregation of deviations is a putative neural substrate for phenotypic similarities between patients assigned the same diagnosis.”

The study was published online in Nature Neuroscience
 

Beyond group averages

For decades, researchers have mapped brain areas showing reduced gray matter volume (GMV) in people diagnosed with a variety of mental illnesses, but these maps have only been generated at the level of group averages, Ms. Segal explained.

“This means that we understand how the brains of people with, say, schizophrenia, differ from those without schizophrenia on average, but we can’t really say much about individual people,” Ms. Segal said.

For their study, the researchers used new statistical techniques developed by Andre Marquand, PhD, who co-led the project, to characterize the heterogeneity of GMV differences in 1,294 individuals diagnosed with one of six psychiatric conditions and 1,465 matched controls. Dr. Marquand is affiliated with the Donders Institute for Brain, Cognition, and Behavior in Nijmegen, the Netherlands.

These techniques “allow us to benchmark the size of over 1,000 different brain regions in any given person relative to what we should expect to see in the general population. In this way, we can identify, for any person, brain regions showing unusually small or large volumes, given that person’s age and sex,” Ms. Segal told this news organization.

The clinical sample included 202 individuals with autism spectrum disorder, 153 with attention-deficit/hyperactivity disorder (ADHD), 228 with bipolar disorder, 161 with major depressive disorder, 167 with obsessive-compulsive disorder, and 383 individuals with schizophrenia.

Confirming earlier findings, those with psychiatric illness showed more GMV deviations than healthy controls, the researchers found.

However, at the individual level, deviations from population expectations for regional gray matter volumes were “highly heterogeneous,” affecting the same area in less than 7% of people with the same diagnosis, they note. “This result means that it is difficult to pinpoint treatment targets or causal mechanisms by focusing on group averages alone,” Alex Fornito, PhD, of Monash University, who led the research team, said in a statement.

“It may also explain why people with the same diagnosis show wide variability in their symptom profiles and treatment outcomes,” Dr. Fornito added.

Yet, despite considerable heterogeneity at the regional level across different diagnoses, these deviations were embedded within common functional circuits and networks in up to 56% of cases. 

The salience-ventral attention network, for example, which plays a central role in cognitive control, interoceptive awareness, and switching between internally and externally focused attention, was implicated across diagnoses, with other neural networks selectively involved in depression, bipolar disorder, schizophrenia, and ADHD.

The researchers say the approach they developed opens new opportunities for mapping brain changes in mental illness.

“The framework we have developed allows us to understand the diversity of brain changes in people with mental illness at different levels, from individual regions through to more widespread brain circuits and networks, offering a deeper insight into how the brain is affected in individual people,” Dr. Fornito said in a statement.

The study had no commercial funding. Ms. Segal, Dr. Fornito, and Dr. Marquand report no relevant financial relationships.

A version of this article first appeared on Medscape.com.

A large brain imaging study of adults with six different psychiatric illnesses shows that heterogeneity in regional gray matter volume deviations is a general feature of psychiatric illness, but that these regionally heterogeneous areas are often embedded within common functional circuits and networks.

The findings suggest that “targeting brain circuits, rather than specific brain regions, may be a more effective way of developing new treatments,” study investigator Ashlea Segal said in an email.

The findings also suggest that it’s “unlikely that a single cause or mechanism of a given disorder exists, and that a ‘one-size-fits-all’ approach to treatment is likely only appropriate for a small subset of individuals. In fact, one size doesn’t fit all. It probably doesn’t even fit most,” said Ms. Segal, a PhD candidate with the Turner Institute for Brain and Mental Health’s Neural Systems and Behaviour Lab at Monash University in Melbourne.

“Focusing on brain alterations at an individual level allows us to develop more personally tailored treatments,” Ms. Segal added.

Regional heterogeneity, the authors write, “thus offers a plausible explanation for the well-described clinical heterogeneity observed in psychiatric disorders, while circuit- and network-level aggregation of deviations is a putative neural substrate for phenotypic similarities between patients assigned the same diagnosis.”

The study was published online in Nature Neuroscience
 

Beyond group averages

For decades, researchers have mapped brain areas showing reduced gray matter volume (GMV) in people diagnosed with a variety of mental illnesses, but these maps have only been generated at the level of group averages, Ms. Segal explained.

“This means that we understand how the brains of people with, say, schizophrenia, differ from those without schizophrenia on average, but we can’t really say much about individual people,” Ms. Segal said.

For their study, the researchers used new statistical techniques developed by Andre Marquand, PhD, who co-led the project, to characterize the heterogeneity of GMV differences in 1,294 individuals diagnosed with one of six psychiatric conditions and 1,465 matched controls. Dr. Marquand is affiliated with the Donders Institute for Brain, Cognition, and Behavior in Nijmegen, the Netherlands.

These techniques “allow us to benchmark the size of over 1,000 different brain regions in any given person relative to what we should expect to see in the general population. In this way, we can identify, for any person, brain regions showing unusually small or large volumes, given that person’s age and sex,” Ms. Segal told this news organization.

The clinical sample included 202 individuals with autism spectrum disorder, 153 with attention-deficit/hyperactivity disorder (ADHD), 228 with bipolar disorder, 161 with major depressive disorder, 167 with obsessive-compulsive disorder, and 383 individuals with schizophrenia.

Confirming earlier findings, those with psychiatric illness showed more GMV deviations than healthy controls, the researchers found.

However, at the individual level, deviations from population expectations for regional gray matter volumes were “highly heterogeneous,” affecting the same area in less than 7% of people with the same diagnosis, they note. “This result means that it is difficult to pinpoint treatment targets or causal mechanisms by focusing on group averages alone,” Alex Fornito, PhD, of Monash University, who led the research team, said in a statement.

“It may also explain why people with the same diagnosis show wide variability in their symptom profiles and treatment outcomes,” Dr. Fornito added.

Yet, despite considerable heterogeneity at the regional level across different diagnoses, these deviations were embedded within common functional circuits and networks in up to 56% of cases. 

The salience-ventral attention network, for example, which plays a central role in cognitive control, interoceptive awareness, and switching between internally and externally focused attention, was implicated across diagnoses, with other neural networks selectively involved in depression, bipolar disorder, schizophrenia, and ADHD.

The researchers say the approach they developed opens new opportunities for mapping brain changes in mental illness.

“The framework we have developed allows us to understand the diversity of brain changes in people with mental illness at different levels, from individual regions through to more widespread brain circuits and networks, offering a deeper insight into how the brain is affected in individual people,” Dr. Fornito said in a statement.

The study had no commercial funding. Ms. Segal, Dr. Fornito, and Dr. Marquand report no relevant financial relationships.

A version of this article first appeared on Medscape.com.

CASE Detoxification and preoccupation with parasites

Mr. H, age 51, has an extensive history of alcohol and methamphetamine use. He presents to the emergency department (ED) requesting inpatient detoxification. He says he had been drinking alcohol but is unable to say how much. His blood ethanol level is 61 mg/dL (unintoxicated level: <50 mg/dL), and a urine drug screen is positive for methamphetamine; Mr. H also admits to using fentanyl. The ED team treats Mr. H’s electrolyte abnormalities, initiates thiamine supplementation, and transfers him to a unit for inpatient withdrawal management.

On the detoxification unit, Mr. H receives a total of 1,950 mg of phenobarbital for alcohol withdrawal and stabilizes on a buprenorphine/naloxone maintenance dose of 8 mg/2 mg twice daily for methamphetamine and fentanyl use. Though he was not taking any psychiatric medications prior to his arrival at the ED, Mr. H agrees to restart quetiapine—which he took when he was younger for suspected bipolar depression—50 mg/d at bedtime.

During Mr. H’s 3-day detoxification, the psychiatry team evaluates him. Mr. H says he believes he is infested with worms. He describes a prior sensation of “meth mites,” or the feeling of bugs crawling under his skin, while using methamphetamines. However, Mr. H says his current infestation feels distinctively different, and he had continued to experience these sensations during prior periods of abstinence.

The psychiatry team expresses concern over his preoccupation with infestations, disheveled appearance, poor hygiene, and healed scars from excoriation. Mr. H also reports poor sleep and appetite and was observed writing an incomprehensible “experiment” on a paper towel. Due to his bizarre behavior, delusional thoughts, and concerns about his inability to care for himself, the team admits Mr. H to the acute inpatient psychiatric unit on a voluntary commitment.

HISTORY Long-standing drug use and repeated hospital visits

Mr. H reports a history of drug use. His first documented ED visit was >5 years before his current admission. He has a family history of substance abuse and reports previously using methamphetamine, heroin, and alcohol. Mr. H was never diagnosed with a psychiatric illness, but when he was younger, there were suspicions of bipolar depression, with no contributing family psychiatric history. Though he took quetiapine at an unspecified younger age, Mr. H did not follow through with any outpatient mental health services or medications.

Mr. H first reported infestation symptoms 6 months before his current inpatient admission, when he came to the ED with complaints of bumps on his arms and legs and reported seeing bugs in his carpet. He was prescribed permethrin 5% topical cream for suspected bedbug infestation.

In the 6 months prior to his current admission, Mr. H came to the hospital >20 times for various reasons, including methamphetamine abuse, alcohol withdrawal, opiate overdose, cellulitis, wound checks, and 3 visits for hallucinations for which he requested physical evaluation and medical care. His substance use was the suspected cause of his tactile and visual hallucinations of infestation because formication—the sensation of something crawling on your skin—is commonly associated with substance use. Although the etiology of Mr. H’s hallucinations was unclear, his substance use may have either precipitated them, or, as the team suspects, masked an underlying pathology that eventually became more evident and required psychiatric treatment.

Continue to: The authors' observations

The authors’ observations

Delusional parasitosis (DP), also known as delusional infestation or Ekbom Syndrome, is a condition characterized by the fixed, false belief of an infestation without any objective evidence. This condition was previously defined in DSM-IV, but was removed from DSM-5-TR. In DSM-5-TR, DP is most closely associated with delusional disorder—somatic type (Table 1¹). It describes a patient with ≥1 month of delusions who does not meet the criteria for schizophrenia with a central theme of delusions involving bodily functions or sensations such as infestation of insects or internal parasites.¹

CP02208048_t1.png

DP is rare, affecting approximately 1.9 per 100,000 people. There has not been consistent data supporting differences in prevalence between sexes, but there is evidence for increasing incidence with age, with a mean age of diagnosis of 61.4.^2,3 DP can be divided into 2 types based on the history and etiology of the symptoms: primary DP and secondary DP. Primary DP occurs when there is a failure to identify an organic cause for the occurrence of the symptoms. Therefore, primary DP requires an extensive investigation by a multidisciplinary team that commonly includes medical specialists for a nonpsychiatric workup. Secondary DP occurs when the patient has delusional symptoms associated with a primary diagnosis of schizophrenia, depression, stroke, diabetes, vitamin B12 deficiency, or substance use.⁴

Though Mr. H initially presented to the ED, patients with DP commonly present to a primary care physician or dermatologist with the complaint of itching or feelings of insects, worms, or unclear organisms inside them. Patients with DP may often develop poor working relationships with physicians while obtaining multiple negative results. They may seek opinions from multiple specialists; however, patients typically do not consider psychiatrists as a source of help. When patients seek psychiatric care, often after a recommendation from a primary care physician or dermatologist, mental health clinicians should listen to and evaluate the patient holistically, continuing to rule out other possible etiologies.

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TREATMENT Finding the right antipsychotic

In the psychiatric unit, Mr. H says he believes worms are exiting his ears, mouth, toenail, and self-inflicted scratch wounds. He believes he has been dealing with the parasites for >1 year and they are slowly draining his energy. Mr. H insists he contracted the “infection” from his home carpet, which was wet due to a flood in his house, and after he had fallen asleep following drug use. He also believes he acquired the parasites while walking barefoot along the beach and collecting rocks, and that there are multiple species living inside him, all intelligent enough to hide, making it difficult to prove their existence. He notes they vary in size, and some have red eyes.

During admission, Mr. H voices his frustration that clinicians had not found the worms he has been seeing. He continuously requests to review imaging performed during his visit and wants a multidisciplinary team to evaluate his case. He demands to test a cup with spit-up “samples,” believing the parasites would be visible under a microscope. Throughout his admission, Mr. H continues to take buprenorphine/naloxone and does not experience withdrawal symptoms. The treatment team titrates his quetiapine to 400 mg/d. Due to the lack of improvement, the team initiates olanzapine 5 mg/d at bedtime. However, Mr. H reports significant tinnitus and requests a medication change. He is started on haloperidol 5 mg twice daily.

Continue to: Mr. H begins to see improvements...

Mr. H begins to see improvements on Day 7 of taking haloperidol. He no longer brings up infestation but still acknowledges having worms inside him when directly asked. He says the worms cause him less distress than before and he is hopeful to live without discomfort. He also demonstrates an ability to conduct activities of daily living. Because Mr. H is being monitored on an acute inpatient psychiatric basis, he is deemed appropriate for discharge even though his symptoms have not yet fully resolved. After a 19-day hospital stay, Mr. H is discharged on haloperidol 15 mg/d and quetiapine 200 mg/d.

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The authors’ observations

Mr. H asked to have his sputum examined. The “specimen sign,” also called “matchbox sign” or “Ziploc bag sign,” in which patients collect what they believe to be infected tissue or organisms in a container, is a well-studied part of DP.⁵ Such samples should be considered during initial encounters and can be examined for formal evaluation, but cautiously. Overtesting may incur a financial burden or reinforce deleterious beliefs and behaviors.

It can be difficult to identify triggers of DP. Research shows DP may arise from nonorganic and stressful life events, home floods, or contact with people infected with parasites.^6,7 Organic causes have also been found, such as patients taking multiple medications for Parkinson disease who developed delusional symptoms.⁸ Buscarino et al⁹ reported the case of a woman who started to develop symptoms of delusions and hallucinations after being on high-dose amphetamines for attention-deficit/hyperactivity disorder. Research shows that stopping the suspected medication commonly improves such symptoms.^9,10 Although methamphetamine can remain detectable in urine for up to 4 days after use and potentially a few days longer for chronic users due to circulating levels,¹¹ Mr. H’s symptoms continued for weeks after all substances of abuse should have been cleared from his system. This suggests he was experiencing a psychiatric illness and was accurate in distinguishing methamphetamine-induced from psychiatric-induced sensations. Regardless, polysubstance use has been shown to potentially increase the risk and play a role in the onset and progression of delusional illness, as seen in prior cases as well as in this case.⁹

It has been hypothesized that the pathophysiology of DP is associated with the deterioration of the striatal dopaminergic pathway, leading to an increase in extracellular dopamine levels. The striatum is responsible for most dopamine reuptake in the brain; therefore, certain drugs such as cocaine, methamphetamine, and methyl­phenidate may precipitate symptoms of DP due to their blockade of presynaptic dopamine reuptake.¹² Additionally, conditions that decrease the functioning of striatal dopamine transporters, such as schizophrenia or depression, may be underlying causes of DP.¹³

Treatment of DP remains a topic of debate. Most current recommendations appear to be based on a small, nonrandomized placebo-controlled trial.¹⁴ The first-generation antipsychotic pimozide had been a first-line treatment for DP, but its adverse effect profile, which includes QTc prolongation and extrapyramidal symptoms, led to the exploration of second-generation antipsychotics such as olanzapine and risperidone.^15,16 There is a dearth of literature about the use of haloperidol, quetiapine, or a combination of both as treatment options for DP, though the combination of these 2 medications proved effective for Mr. H. Further research is necessary to justify changes to current treatment standards, but this finding highlights a successful symptom reduction achieved with this combination.

Continue to: Patients may experience genuine symptoms...

Patients may experience genuine symptoms despite the delusional nature of DP, and it is important for clinicians to recognize the potential burden and anxiety these individuals face. Patients may present with self-inflicted bruises, cuts, and erosions to gain access to infected areas, which may be confused with skin picking disorder. Excessive cleansing or use of irritant products can also cause skin damage, leading to other dermatological conditions that reinforce the patient’s belief that something is medically wrong. During treatment, consider medications for relief of pruritus or pain. Focus on offering patients the opportunity to express their concerns, treat them with empathy, avoid stigmatizing language such as “delusions” or “psychosis,” and refrain from contradicting them until a strong rapport has been established (Table 2¹⁷).

CP02208048_t2.png

Symptoms of DP can persist for months to years. Patients who fully recovered experienced a median duration of 0.5 years until symptom resolution, compared to incompletely recovered patients, who took approximately 1 year.¹⁸ Primary DP has slower improvement rates compared to secondary DP, with the median onset of effects occurring at Week 1.5 and peak improvements occurring at Week 6.¹⁶

OUTCOME Continued ED visits

Unfortunately, Mr. H does not follow through with his outpatient psychiatry appointments. In the 7 months following discharge, he visits the ED 8 times for alcohol intoxication, alcohol withdrawal, and methamphetamine abuse, in addition to 2 admissions for inpatient detoxification, during which he was still receiving the same scheduled medications (haloperidol 15 mg/d and quetiapine 200 mg/d). At each of his ED visits, there was no documentation of DP symptoms, which suggests his symptoms may have resolved.

Bottom Line

Because delusional parasitosis symptoms feel real to patients, it is crucial to build rapport to recommend and successfully initiate treatment. After ruling out nonpsychiatric etiologies, consider traditional treatment with antipsychotics, and consider medications for relief of pruritus or pain.

Related Resources

• Sellman D, Phan SV, Inyang M. Bugs on her skin—but nobody else sees them. Current Psychiatry. 2018;17(8):48,50-53.
• Campbell EH, Elston DM, Hawthorne JD, et al. Diagnosis and management of delusional parasitosis. J Am Acad Dermatol. 2019;80(5):1428-1434. doi:10.1016/j.jaad.2018.12.012

Drug Brand Names

Buprenorphine/naloxone • Suboxone
Haloperidol • Haldol
Hydroxyzine • Vistaril
Lithium • Eskalith, Lithobid
Methylphenidate • Concerta
Olanzapine • Zyprexa
Permethrin • Elimite
Phenobarbital • Solfoton, Tedral, Luminal
Pimozide • Orap
Quetiapine • Seroquel
Risperidone • Risperdal
Sertraline • Zoloft
Valproic acid • Depakote

[embed:render:related:node:171140]

CASE Detoxification and preoccupation with parasites

Mr. H, age 51, has an extensive history of alcohol and methamphetamine use. He presents to the emergency department (ED) requesting inpatient detoxification. He says he had been drinking alcohol but is unable to say how much. His blood ethanol level is 61 mg/dL (unintoxicated level: <50 mg/dL), and a urine drug screen is positive for methamphetamine; Mr. H also admits to using fentanyl. The ED team treats Mr. H’s electrolyte abnormalities, initiates thiamine supplementation, and transfers him to a unit for inpatient withdrawal management.

On the detoxification unit, Mr. H receives a total of 1,950 mg of phenobarbital for alcohol withdrawal and stabilizes on a buprenorphine/naloxone maintenance dose of 8 mg/2 mg twice daily for methamphetamine and fentanyl use. Though he was not taking any psychiatric medications prior to his arrival at the ED, Mr. H agrees to restart quetiapine—which he took when he was younger for suspected bipolar depression—50 mg/d at bedtime.

During Mr. H’s 3-day detoxification, the psychiatry team evaluates him. Mr. H says he believes he is infested with worms. He describes a prior sensation of “meth mites,” or the feeling of bugs crawling under his skin, while using methamphetamines. However, Mr. H says his current infestation feels distinctively different, and he had continued to experience these sensations during prior periods of abstinence.

The psychiatry team expresses concern over his preoccupation with infestations, disheveled appearance, poor hygiene, and healed scars from excoriation. Mr. H also reports poor sleep and appetite and was observed writing an incomprehensible “experiment” on a paper towel. Due to his bizarre behavior, delusional thoughts, and concerns about his inability to care for himself, the team admits Mr. H to the acute inpatient psychiatric unit on a voluntary commitment.

HISTORY Long-standing drug use and repeated hospital visits

Mr. H reports a history of drug use. His first documented ED visit was >5 years before his current admission. He has a family history of substance abuse and reports previously using methamphetamine, heroin, and alcohol. Mr. H was never diagnosed with a psychiatric illness, but when he was younger, there were suspicions of bipolar depression, with no contributing family psychiatric history. Though he took quetiapine at an unspecified younger age, Mr. H did not follow through with any outpatient mental health services or medications.

Mr. H first reported infestation symptoms 6 months before his current inpatient admission, when he came to the ED with complaints of bumps on his arms and legs and reported seeing bugs in his carpet. He was prescribed permethrin 5% topical cream for suspected bedbug infestation.

In the 6 months prior to his current admission, Mr. H came to the hospital >20 times for various reasons, including methamphetamine abuse, alcohol withdrawal, opiate overdose, cellulitis, wound checks, and 3 visits for hallucinations for which he requested physical evaluation and medical care. His substance use was the suspected cause of his tactile and visual hallucinations of infestation because formication—the sensation of something crawling on your skin—is commonly associated with substance use. Although the etiology of Mr. H’s hallucinations was unclear, his substance use may have either precipitated them, or, as the team suspects, masked an underlying pathology that eventually became more evident and required psychiatric treatment.

Continue to: The authors' observations

The authors’ observations

Delusional parasitosis (DP), also known as delusional infestation or Ekbom Syndrome, is a condition characterized by the fixed, false belief of an infestation without any objective evidence. This condition was previously defined in DSM-IV, but was removed from DSM-5-TR. In DSM-5-TR, DP is most closely associated with delusional disorder—somatic type (Table 1¹). It describes a patient with ≥1 month of delusions who does not meet the criteria for schizophrenia with a central theme of delusions involving bodily functions or sensations such as infestation of insects or internal parasites.¹

CP02208048_t1.png

DP is rare, affecting approximately 1.9 per 100,000 people. There has not been consistent data supporting differences in prevalence between sexes, but there is evidence for increasing incidence with age, with a mean age of diagnosis of 61.4.^2,3 DP can be divided into 2 types based on the history and etiology of the symptoms: primary DP and secondary DP. Primary DP occurs when there is a failure to identify an organic cause for the occurrence of the symptoms. Therefore, primary DP requires an extensive investigation by a multidisciplinary team that commonly includes medical specialists for a nonpsychiatric workup. Secondary DP occurs when the patient has delusional symptoms associated with a primary diagnosis of schizophrenia, depression, stroke, diabetes, vitamin B12 deficiency, or substance use.⁴

Though Mr. H initially presented to the ED, patients with DP commonly present to a primary care physician or dermatologist with the complaint of itching or feelings of insects, worms, or unclear organisms inside them. Patients with DP may often develop poor working relationships with physicians while obtaining multiple negative results. They may seek opinions from multiple specialists; however, patients typically do not consider psychiatrists as a source of help. When patients seek psychiatric care, often after a recommendation from a primary care physician or dermatologist, mental health clinicians should listen to and evaluate the patient holistically, continuing to rule out other possible etiologies.

[polldaddy:12570072]

TREATMENT Finding the right antipsychotic

In the psychiatric unit, Mr. H says he believes worms are exiting his ears, mouth, toenail, and self-inflicted scratch wounds. He believes he has been dealing with the parasites for >1 year and they are slowly draining his energy. Mr. H insists he contracted the “infection” from his home carpet, which was wet due to a flood in his house, and after he had fallen asleep following drug use. He also believes he acquired the parasites while walking barefoot along the beach and collecting rocks, and that there are multiple species living inside him, all intelligent enough to hide, making it difficult to prove their existence. He notes they vary in size, and some have red eyes.

During admission, Mr. H voices his frustration that clinicians had not found the worms he has been seeing. He continuously requests to review imaging performed during his visit and wants a multidisciplinary team to evaluate his case. He demands to test a cup with spit-up “samples,” believing the parasites would be visible under a microscope. Throughout his admission, Mr. H continues to take buprenorphine/naloxone and does not experience withdrawal symptoms. The treatment team titrates his quetiapine to 400 mg/d. Due to the lack of improvement, the team initiates olanzapine 5 mg/d at bedtime. However, Mr. H reports significant tinnitus and requests a medication change. He is started on haloperidol 5 mg twice daily.

Continue to: Mr. H begins to see improvements...

Mr. H begins to see improvements on Day 7 of taking haloperidol. He no longer brings up infestation but still acknowledges having worms inside him when directly asked. He says the worms cause him less distress than before and he is hopeful to live without discomfort. He also demonstrates an ability to conduct activities of daily living. Because Mr. H is being monitored on an acute inpatient psychiatric basis, he is deemed appropriate for discharge even though his symptoms have not yet fully resolved. After a 19-day hospital stay, Mr. H is discharged on haloperidol 15 mg/d and quetiapine 200 mg/d.

[polldaddy:12570074]

The authors’ observations

Mr. H asked to have his sputum examined. The “specimen sign,” also called “matchbox sign” or “Ziploc bag sign,” in which patients collect what they believe to be infected tissue or organisms in a container, is a well-studied part of DP.⁵ Such samples should be considered during initial encounters and can be examined for formal evaluation, but cautiously. Overtesting may incur a financial burden or reinforce deleterious beliefs and behaviors.

It can be difficult to identify triggers of DP. Research shows DP may arise from nonorganic and stressful life events, home floods, or contact with people infected with parasites.^6,7 Organic causes have also been found, such as patients taking multiple medications for Parkinson disease who developed delusional symptoms.⁸ Buscarino et al⁹ reported the case of a woman who started to develop symptoms of delusions and hallucinations after being on high-dose amphetamines for attention-deficit/hyperactivity disorder. Research shows that stopping the suspected medication commonly improves such symptoms.^9,10 Although methamphetamine can remain detectable in urine for up to 4 days after use and potentially a few days longer for chronic users due to circulating levels,¹¹ Mr. H’s symptoms continued for weeks after all substances of abuse should have been cleared from his system. This suggests he was experiencing a psychiatric illness and was accurate in distinguishing methamphetamine-induced from psychiatric-induced sensations. Regardless, polysubstance use has been shown to potentially increase the risk and play a role in the onset and progression of delusional illness, as seen in prior cases as well as in this case.⁹

It has been hypothesized that the pathophysiology of DP is associated with the deterioration of the striatal dopaminergic pathway, leading to an increase in extracellular dopamine levels. The striatum is responsible for most dopamine reuptake in the brain; therefore, certain drugs such as cocaine, methamphetamine, and methyl­phenidate may precipitate symptoms of DP due to their blockade of presynaptic dopamine reuptake.¹² Additionally, conditions that decrease the functioning of striatal dopamine transporters, such as schizophrenia or depression, may be underlying causes of DP.¹³

Treatment of DP remains a topic of debate. Most current recommendations appear to be based on a small, nonrandomized placebo-controlled trial.¹⁴ The first-generation antipsychotic pimozide had been a first-line treatment for DP, but its adverse effect profile, which includes QTc prolongation and extrapyramidal symptoms, led to the exploration of second-generation antipsychotics such as olanzapine and risperidone.^15,16 There is a dearth of literature about the use of haloperidol, quetiapine, or a combination of both as treatment options for DP, though the combination of these 2 medications proved effective for Mr. H. Further research is necessary to justify changes to current treatment standards, but this finding highlights a successful symptom reduction achieved with this combination.

Continue to: Patients may experience genuine symptoms...

Patients may experience genuine symptoms despite the delusional nature of DP, and it is important for clinicians to recognize the potential burden and anxiety these individuals face. Patients may present with self-inflicted bruises, cuts, and erosions to gain access to infected areas, which may be confused with skin picking disorder. Excessive cleansing or use of irritant products can also cause skin damage, leading to other dermatological conditions that reinforce the patient’s belief that something is medically wrong. During treatment, consider medications for relief of pruritus or pain. Focus on offering patients the opportunity to express their concerns, treat them with empathy, avoid stigmatizing language such as “delusions” or “psychosis,” and refrain from contradicting them until a strong rapport has been established (Table 2¹⁷).

CP02208048_t2.png

Symptoms of DP can persist for months to years. Patients who fully recovered experienced a median duration of 0.5 years until symptom resolution, compared to incompletely recovered patients, who took approximately 1 year.¹⁸ Primary DP has slower improvement rates compared to secondary DP, with the median onset of effects occurring at Week 1.5 and peak improvements occurring at Week 6.¹⁶

OUTCOME Continued ED visits

Unfortunately, Mr. H does not follow through with his outpatient psychiatry appointments. In the 7 months following discharge, he visits the ED 8 times for alcohol intoxication, alcohol withdrawal, and methamphetamine abuse, in addition to 2 admissions for inpatient detoxification, during which he was still receiving the same scheduled medications (haloperidol 15 mg/d and quetiapine 200 mg/d). At each of his ED visits, there was no documentation of DP symptoms, which suggests his symptoms may have resolved.

Bottom Line

Because delusional parasitosis symptoms feel real to patients, it is crucial to build rapport to recommend and successfully initiate treatment. After ruling out nonpsychiatric etiologies, consider traditional treatment with antipsychotics, and consider medications for relief of pruritus or pain.

Related Resources

• Sellman D, Phan SV, Inyang M. Bugs on her skin—but nobody else sees them. Current Psychiatry. 2018;17(8):48,50-53.
• Campbell EH, Elston DM, Hawthorne JD, et al. Diagnosis and management of delusional parasitosis. J Am Acad Dermatol. 2019;80(5):1428-1434. doi:10.1016/j.jaad.2018.12.012

Drug Brand Names

Buprenorphine/naloxone • Suboxone
Haloperidol • Haldol
Hydroxyzine • Vistaril
Lithium • Eskalith, Lithobid
Methylphenidate • Concerta
Olanzapine • Zyprexa
Permethrin • Elimite
Phenobarbital • Solfoton, Tedral, Luminal
Pimozide • Orap
Quetiapine • Seroquel
Risperidone • Risperdal
Sertraline • Zoloft
Valproic acid • Depakote

[embed:render:related:node:171140]

CASE Detoxification and preoccupation with parasites

Mr. H, age 51, has an extensive history of alcohol and methamphetamine use. He presents to the emergency department (ED) requesting inpatient detoxification. He says he had been drinking alcohol but is unable to say how much. His blood ethanol level is 61 mg/dL (unintoxicated level: <50 mg/dL), and a urine drug screen is positive for methamphetamine; Mr. H also admits to using fentanyl. The ED team treats Mr. H’s electrolyte abnormalities, initiates thiamine supplementation, and transfers him to a unit for inpatient withdrawal management.

On the detoxification unit, Mr. H receives a total of 1,950 mg of phenobarbital for alcohol withdrawal and stabilizes on a buprenorphine/naloxone maintenance dose of 8 mg/2 mg twice daily for methamphetamine and fentanyl use. Though he was not taking any psychiatric medications prior to his arrival at the ED, Mr. H agrees to restart quetiapine—which he took when he was younger for suspected bipolar depression—50 mg/d at bedtime.

During Mr. H’s 3-day detoxification, the psychiatry team evaluates him. Mr. H says he believes he is infested with worms. He describes a prior sensation of “meth mites,” or the feeling of bugs crawling under his skin, while using methamphetamines. However, Mr. H says his current infestation feels distinctively different, and he had continued to experience these sensations during prior periods of abstinence.

The psychiatry team expresses concern over his preoccupation with infestations, disheveled appearance, poor hygiene, and healed scars from excoriation. Mr. H also reports poor sleep and appetite and was observed writing an incomprehensible “experiment” on a paper towel. Due to his bizarre behavior, delusional thoughts, and concerns about his inability to care for himself, the team admits Mr. H to the acute inpatient psychiatric unit on a voluntary commitment.

HISTORY Long-standing drug use and repeated hospital visits

Mr. H reports a history of drug use. His first documented ED visit was >5 years before his current admission. He has a family history of substance abuse and reports previously using methamphetamine, heroin, and alcohol. Mr. H was never diagnosed with a psychiatric illness, but when he was younger, there were suspicions of bipolar depression, with no contributing family psychiatric history. Though he took quetiapine at an unspecified younger age, Mr. H did not follow through with any outpatient mental health services or medications.

Mr. H first reported infestation symptoms 6 months before his current inpatient admission, when he came to the ED with complaints of bumps on his arms and legs and reported seeing bugs in his carpet. He was prescribed permethrin 5% topical cream for suspected bedbug infestation.

In the 6 months prior to his current admission, Mr. H came to the hospital >20 times for various reasons, including methamphetamine abuse, alcohol withdrawal, opiate overdose, cellulitis, wound checks, and 3 visits for hallucinations for which he requested physical evaluation and medical care. His substance use was the suspected cause of his tactile and visual hallucinations of infestation because formication—the sensation of something crawling on your skin—is commonly associated with substance use. Although the etiology of Mr. H’s hallucinations was unclear, his substance use may have either precipitated them, or, as the team suspects, masked an underlying pathology that eventually became more evident and required psychiatric treatment.

Continue to: The authors' observations

The authors’ observations

Delusional parasitosis (DP), also known as delusional infestation or Ekbom Syndrome, is a condition characterized by the fixed, false belief of an infestation without any objective evidence. This condition was previously defined in DSM-IV, but was removed from DSM-5-TR. In DSM-5-TR, DP is most closely associated with delusional disorder—somatic type (Table 1¹). It describes a patient with ≥1 month of delusions who does not meet the criteria for schizophrenia with a central theme of delusions involving bodily functions or sensations such as infestation of insects or internal parasites.¹

CP02208048_t1.png

DP is rare, affecting approximately 1.9 per 100,000 people. There has not been consistent data supporting differences in prevalence between sexes, but there is evidence for increasing incidence with age, with a mean age of diagnosis of 61.4.^2,3 DP can be divided into 2 types based on the history and etiology of the symptoms: primary DP and secondary DP. Primary DP occurs when there is a failure to identify an organic cause for the occurrence of the symptoms. Therefore, primary DP requires an extensive investigation by a multidisciplinary team that commonly includes medical specialists for a nonpsychiatric workup. Secondary DP occurs when the patient has delusional symptoms associated with a primary diagnosis of schizophrenia, depression, stroke, diabetes, vitamin B12 deficiency, or substance use.⁴

Though Mr. H initially presented to the ED, patients with DP commonly present to a primary care physician or dermatologist with the complaint of itching or feelings of insects, worms, or unclear organisms inside them. Patients with DP may often develop poor working relationships with physicians while obtaining multiple negative results. They may seek opinions from multiple specialists; however, patients typically do not consider psychiatrists as a source of help. When patients seek psychiatric care, often after a recommendation from a primary care physician or dermatologist, mental health clinicians should listen to and evaluate the patient holistically, continuing to rule out other possible etiologies.

[polldaddy:12570072]

TREATMENT Finding the right antipsychotic

In the psychiatric unit, Mr. H says he believes worms are exiting his ears, mouth, toenail, and self-inflicted scratch wounds. He believes he has been dealing with the parasites for >1 year and they are slowly draining his energy. Mr. H insists he contracted the “infection” from his home carpet, which was wet due to a flood in his house, and after he had fallen asleep following drug use. He also believes he acquired the parasites while walking barefoot along the beach and collecting rocks, and that there are multiple species living inside him, all intelligent enough to hide, making it difficult to prove their existence. He notes they vary in size, and some have red eyes.

During admission, Mr. H voices his frustration that clinicians had not found the worms he has been seeing. He continuously requests to review imaging performed during his visit and wants a multidisciplinary team to evaluate his case. He demands to test a cup with spit-up “samples,” believing the parasites would be visible under a microscope. Throughout his admission, Mr. H continues to take buprenorphine/naloxone and does not experience withdrawal symptoms. The treatment team titrates his quetiapine to 400 mg/d. Due to the lack of improvement, the team initiates olanzapine 5 mg/d at bedtime. However, Mr. H reports significant tinnitus and requests a medication change. He is started on haloperidol 5 mg twice daily.

Continue to: Mr. H begins to see improvements...

Mr. H begins to see improvements on Day 7 of taking haloperidol. He no longer brings up infestation but still acknowledges having worms inside him when directly asked. He says the worms cause him less distress than before and he is hopeful to live without discomfort. He also demonstrates an ability to conduct activities of daily living. Because Mr. H is being monitored on an acute inpatient psychiatric basis, he is deemed appropriate for discharge even though his symptoms have not yet fully resolved. After a 19-day hospital stay, Mr. H is discharged on haloperidol 15 mg/d and quetiapine 200 mg/d.

[polldaddy:12570074]

The authors’ observations

Mr. H asked to have his sputum examined. The “specimen sign,” also called “matchbox sign” or “Ziploc bag sign,” in which patients collect what they believe to be infected tissue or organisms in a container, is a well-studied part of DP.⁵ Such samples should be considered during initial encounters and can be examined for formal evaluation, but cautiously. Overtesting may incur a financial burden or reinforce deleterious beliefs and behaviors.

It can be difficult to identify triggers of DP. Research shows DP may arise from nonorganic and stressful life events, home floods, or contact with people infected with parasites.^6,7 Organic causes have also been found, such as patients taking multiple medications for Parkinson disease who developed delusional symptoms.⁸ Buscarino et al⁹ reported the case of a woman who started to develop symptoms of delusions and hallucinations after being on high-dose amphetamines for attention-deficit/hyperactivity disorder. Research shows that stopping the suspected medication commonly improves such symptoms.^9,10 Although methamphetamine can remain detectable in urine for up to 4 days after use and potentially a few days longer for chronic users due to circulating levels,¹¹ Mr. H’s symptoms continued for weeks after all substances of abuse should have been cleared from his system. This suggests he was experiencing a psychiatric illness and was accurate in distinguishing methamphetamine-induced from psychiatric-induced sensations. Regardless, polysubstance use has been shown to potentially increase the risk and play a role in the onset and progression of delusional illness, as seen in prior cases as well as in this case.⁹

It has been hypothesized that the pathophysiology of DP is associated with the deterioration of the striatal dopaminergic pathway, leading to an increase in extracellular dopamine levels. The striatum is responsible for most dopamine reuptake in the brain; therefore, certain drugs such as cocaine, methamphetamine, and methyl­phenidate may precipitate symptoms of DP due to their blockade of presynaptic dopamine reuptake.¹² Additionally, conditions that decrease the functioning of striatal dopamine transporters, such as schizophrenia or depression, may be underlying causes of DP.¹³

Treatment of DP remains a topic of debate. Most current recommendations appear to be based on a small, nonrandomized placebo-controlled trial.¹⁴ The first-generation antipsychotic pimozide had been a first-line treatment for DP, but its adverse effect profile, which includes QTc prolongation and extrapyramidal symptoms, led to the exploration of second-generation antipsychotics such as olanzapine and risperidone.^15,16 There is a dearth of literature about the use of haloperidol, quetiapine, or a combination of both as treatment options for DP, though the combination of these 2 medications proved effective for Mr. H. Further research is necessary to justify changes to current treatment standards, but this finding highlights a successful symptom reduction achieved with this combination.

Continue to: Patients may experience genuine symptoms...

Patients may experience genuine symptoms despite the delusional nature of DP, and it is important for clinicians to recognize the potential burden and anxiety these individuals face. Patients may present with self-inflicted bruises, cuts, and erosions to gain access to infected areas, which may be confused with skin picking disorder. Excessive cleansing or use of irritant products can also cause skin damage, leading to other dermatological conditions that reinforce the patient’s belief that something is medically wrong. During treatment, consider medications for relief of pruritus or pain. Focus on offering patients the opportunity to express their concerns, treat them with empathy, avoid stigmatizing language such as “delusions” or “psychosis,” and refrain from contradicting them until a strong rapport has been established (Table 2¹⁷).

CP02208048_t2.png

Symptoms of DP can persist for months to years. Patients who fully recovered experienced a median duration of 0.5 years until symptom resolution, compared to incompletely recovered patients, who took approximately 1 year.¹⁸ Primary DP has slower improvement rates compared to secondary DP, with the median onset of effects occurring at Week 1.5 and peak improvements occurring at Week 6.¹⁶

OUTCOME Continued ED visits

Unfortunately, Mr. H does not follow through with his outpatient psychiatry appointments. In the 7 months following discharge, he visits the ED 8 times for alcohol intoxication, alcohol withdrawal, and methamphetamine abuse, in addition to 2 admissions for inpatient detoxification, during which he was still receiving the same scheduled medications (haloperidol 15 mg/d and quetiapine 200 mg/d). At each of his ED visits, there was no documentation of DP symptoms, which suggests his symptoms may have resolved.

Bottom Line

Because delusional parasitosis symptoms feel real to patients, it is crucial to build rapport to recommend and successfully initiate treatment. After ruling out nonpsychiatric etiologies, consider traditional treatment with antipsychotics, and consider medications for relief of pruritus or pain.

Related Resources

• Sellman D, Phan SV, Inyang M. Bugs on her skin—but nobody else sees them. Current Psychiatry. 2018;17(8):48,50-53.
• Campbell EH, Elston DM, Hawthorne JD, et al. Diagnosis and management of delusional parasitosis. J Am Acad Dermatol. 2019;80(5):1428-1434. doi:10.1016/j.jaad.2018.12.012

Drug Brand Names

Buprenorphine/naloxone • Suboxone
Haloperidol • Haldol
Hydroxyzine • Vistaril
Lithium • Eskalith, Lithobid
Methylphenidate • Concerta
Olanzapine • Zyprexa
Permethrin • Elimite
Phenobarbital • Solfoton, Tedral, Luminal
Pimozide • Orap
Quetiapine • Seroquel
Risperidone • Risperdal
Sertraline • Zoloft
Valproic acid • Depakote

[embed:render:related:node:171140]

Declines in verbal working memory were significantly associated with an increased risk of relapse in remitted psychosis patients, based on data from 110 individuals.

Previous research has suggested that cognitive impairments may predict recurrent psychotic episodes, but data on the association between specific cognitive deficits and relapse of psychosis over time are limited, wrote Tiffany J. Tao, MPhil, a PhD candidate at the University of Hong Kong, and colleagues.

In a naturalistic 1-year follow-up study published in Psychiatry Research , the researchers recruited psychosis patients with full remission for a least 6 months from two outpatient psychiatric clinics. The study population included adults aged 18-55 years, with an average age of 29.2 years; 62% were women. Relapse, defined as a recurrence of psychotic symptoms measured by the Positive and Negative Syndrome Scale (PANSS) and the Clinical Global Impression Scale, was assessed monthly via phone interviews with the use of a smartphone app. Cognitive decline was based on working memory deterioration, assessed monthly via the Visual Patterns Test (VPT) and the Letter-Number Sequencing (LNS) test, respectively, for visual and verbal working memory.

Tao_Tiffany_J_HongKong_web.jpg

Overall, 18 patients (16%) experienced a relapse at 1 year. One-third of these (six patients) required hospitalization, with a median hospital stay of 23 days.

In a multivariate analysis, independent and significant predictors of relapse were verbal working memory deterioration 2 months prior to relapse (P = .029), worse medication adherence (P = .018), and less resilience (P = .014) with odds ratios of 9.445, 0.051, and 0.769, respectively.

“Specifically, declines in verbal working memory were observed beginning at 2 months prior to the relapse episode in both the univariate and multivariate models after controlling for other significant predictors,” the researchers wrote in their discussion.

The mechanism of action for the association remains unclear, but cognitive impairment might reflect dopamine dysregulation or other processes in the prefrontal cortex that could contribute to psychotic relapse, they said.

Other factors include the associations between cognitive impairment and medication nonadherence, and the impact of cognitive impairment on a patient’s ability to manage the stresses of daily living that could trigger a psychotic relapse, they added.

Notably, the current study identified verbal working memory, but not visual working memory, as a predictor of relapse, which is important given the different neurobiological bases for visual and verbal tasks, the researchers wrote.

The study findings were limited by several factors including the inability to identify weaker predictors of relapse given the low relapse rate, and potential lack of generalizability to other less homogeneous populations, and the exclusion of patients with illicit drug use, the researchers noted.

However, the results were strengthened by the prospective measurements that prevented recall bias, and the inclusion of other objective predictors of relapse. The findings highlight the potential for early intervention to prevent relapse based on cognitive assessment, which can be measured objectively in the clinical setting or remotely from home using digital technology, they concluded.

The study received no outside funding. Ms. Tao had no financial conflicts to disclose.

Declines in verbal working memory were significantly associated with an increased risk of relapse in remitted psychosis patients, based on data from 110 individuals.

Previous research has suggested that cognitive impairments may predict recurrent psychotic episodes, but data on the association between specific cognitive deficits and relapse of psychosis over time are limited, wrote Tiffany J. Tao, MPhil, a PhD candidate at the University of Hong Kong, and colleagues.

In a naturalistic 1-year follow-up study published in Psychiatry Research , the researchers recruited psychosis patients with full remission for a least 6 months from two outpatient psychiatric clinics. The study population included adults aged 18-55 years, with an average age of 29.2 years; 62% were women. Relapse, defined as a recurrence of psychotic symptoms measured by the Positive and Negative Syndrome Scale (PANSS) and the Clinical Global Impression Scale, was assessed monthly via phone interviews with the use of a smartphone app. Cognitive decline was based on working memory deterioration, assessed monthly via the Visual Patterns Test (VPT) and the Letter-Number Sequencing (LNS) test, respectively, for visual and verbal working memory.

Tao_Tiffany_J_HongKong_web.jpg

Overall, 18 patients (16%) experienced a relapse at 1 year. One-third of these (six patients) required hospitalization, with a median hospital stay of 23 days.

In a multivariate analysis, independent and significant predictors of relapse were verbal working memory deterioration 2 months prior to relapse (P = .029), worse medication adherence (P = .018), and less resilience (P = .014) with odds ratios of 9.445, 0.051, and 0.769, respectively.

“Specifically, declines in verbal working memory were observed beginning at 2 months prior to the relapse episode in both the univariate and multivariate models after controlling for other significant predictors,” the researchers wrote in their discussion.

The mechanism of action for the association remains unclear, but cognitive impairment might reflect dopamine dysregulation or other processes in the prefrontal cortex that could contribute to psychotic relapse, they said.

Other factors include the associations between cognitive impairment and medication nonadherence, and the impact of cognitive impairment on a patient’s ability to manage the stresses of daily living that could trigger a psychotic relapse, they added.

Notably, the current study identified verbal working memory, but not visual working memory, as a predictor of relapse, which is important given the different neurobiological bases for visual and verbal tasks, the researchers wrote.

The study findings were limited by several factors including the inability to identify weaker predictors of relapse given the low relapse rate, and potential lack of generalizability to other less homogeneous populations, and the exclusion of patients with illicit drug use, the researchers noted.

However, the results were strengthened by the prospective measurements that prevented recall bias, and the inclusion of other objective predictors of relapse. The findings highlight the potential for early intervention to prevent relapse based on cognitive assessment, which can be measured objectively in the clinical setting or remotely from home using digital technology, they concluded.

The study received no outside funding. Ms. Tao had no financial conflicts to disclose.

Declines in verbal working memory were significantly associated with an increased risk of relapse in remitted psychosis patients, based on data from 110 individuals.

Previous research has suggested that cognitive impairments may predict recurrent psychotic episodes, but data on the association between specific cognitive deficits and relapse of psychosis over time are limited, wrote Tiffany J. Tao, MPhil, a PhD candidate at the University of Hong Kong, and colleagues.

In a naturalistic 1-year follow-up study published in Psychiatry Research , the researchers recruited psychosis patients with full remission for a least 6 months from two outpatient psychiatric clinics. The study population included adults aged 18-55 years, with an average age of 29.2 years; 62% were women. Relapse, defined as a recurrence of psychotic symptoms measured by the Positive and Negative Syndrome Scale (PANSS) and the Clinical Global Impression Scale, was assessed monthly via phone interviews with the use of a smartphone app. Cognitive decline was based on working memory deterioration, assessed monthly via the Visual Patterns Test (VPT) and the Letter-Number Sequencing (LNS) test, respectively, for visual and verbal working memory.

Tao_Tiffany_J_HongKong_web.jpg

Overall, 18 patients (16%) experienced a relapse at 1 year. One-third of these (six patients) required hospitalization, with a median hospital stay of 23 days.

In a multivariate analysis, independent and significant predictors of relapse were verbal working memory deterioration 2 months prior to relapse (P = .029), worse medication adherence (P = .018), and less resilience (P = .014) with odds ratios of 9.445, 0.051, and 0.769, respectively.

“Specifically, declines in verbal working memory were observed beginning at 2 months prior to the relapse episode in both the univariate and multivariate models after controlling for other significant predictors,” the researchers wrote in their discussion.

The mechanism of action for the association remains unclear, but cognitive impairment might reflect dopamine dysregulation or other processes in the prefrontal cortex that could contribute to psychotic relapse, they said.

Other factors include the associations between cognitive impairment and medication nonadherence, and the impact of cognitive impairment on a patient’s ability to manage the stresses of daily living that could trigger a psychotic relapse, they added.

Notably, the current study identified verbal working memory, but not visual working memory, as a predictor of relapse, which is important given the different neurobiological bases for visual and verbal tasks, the researchers wrote.

The study findings were limited by several factors including the inability to identify weaker predictors of relapse given the low relapse rate, and potential lack of generalizability to other less homogeneous populations, and the exclusion of patients with illicit drug use, the researchers noted.

However, the results were strengthened by the prospective measurements that prevented recall bias, and the inclusion of other objective predictors of relapse. The findings highlight the potential for early intervention to prevent relapse based on cognitive assessment, which can be measured objectively in the clinical setting or remotely from home using digital technology, they concluded.

The study received no outside funding. Ms. Tao had no financial conflicts to disclose.

Roughly 3.7 million adults have a history of schizophrenia spectrum disorders – a figure two to three times higher than previously assumed, according to the first study to estimate the national prevalence of schizophrenia spectrum disorders.

This finding is “especially important,” given that people with schizophrenia spectrum disorders experience “high levels of disability that present significant challenges in all aspects of their life,” principal investigator Heather Ringeisen, PhD, with RTI International, a nonprofit research institute based on Research Triangle Park, N.C., said in a statement.

The results “highlight the need to improve systems of care and access to treatment for people with schizophrenia and other mental health disorders,” added co–principal investigator Mark J. Edlund, MD, PhD, also with RTI.

The study also found that prevalence rates of many other nonpsychotic disorders were generally within an expected range in light of findings from prior research – with three exceptions.

Rates of major depressive disorder (MDD), generalized anxiety disorder (GAD), and obsessive-compulsive disorder (OCD) were higher than reported in past nationally representative samples.

The new data come from the Mental and Substance Use Disorder Prevalence Study (MDPS), a pilot program funded by the Substance Abuse and Mental Health Services Administration (SAMHSA).

A nationally representative sample of 5,679 adults aged 18-65 residing in U.S. households, prisons, homeless shelters, and state psychiatric hospitals were interviewed, virtually or in person, between October 2020 and October 2022.

The research team used a population-based version of the Structured Clinical Interview of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; SCID-5) for mental health and substance use disorder diagnostic assessment.

Among the key findings in the report:

• Nearly 2% of adults (about 3.7 million) had a lifetime history of schizophrenia spectrum disorders, which include schizophrenia, schizoaffective disorder, and schizophreniform disorder.
• Roughly 2.5 million adults (1.2%) met diagnostic criteria for a schizophrenia spectrum disorder in the past year.
• The two most common mental disorders among adults were MDD (15.5%, or about 31.4 million) and GAD (10.0%, or about 20.2 million).
• Approximately 8.2 million adults (4.1%) had past-year posttraumatic stress disorder, about 5.0 million (2.5%) had OCD, and roughly 3.1 million (1.5%) had bipolar I disorder.
• Alcohol use disorder (AUD) was the most common substance use disorder among adults aged 18-65; roughly 13.4 million adults (6.7%) met criteria for AUD in the past year.
• About 7.7 million adults (3.8%) had cannabis use disorder, about 3.2 million (1.6%) had stimulant use disorder, and about 1 million (0.5%) had opioid use disorder.

Multiple comorbidities

The data also show that one in four adults had at least one mental health disorder in the past year, most commonly MDD and GAD.

About 11% of adults met the criteria for at least one substance use disorder, with AUD and cannabis use disorder the most common.

In addition, an estimated 11 million adults aged 18-65 had both a mental health disorder and a substance use disorder in the past year.

Encouragingly, the findings suggest that more individuals are seeking and accessing treatment compared with previous studies, the authors noted; 61% of adults with a mental health disorder reported having at least one visit with a treatment provider in the past year.

However, considerable treatment gaps still exist for the most common mental health disorders, they reported. Within the past year, more than 40% of adults with MDD and more than 30% of those with GAD did not receive any treatment services.

The full report is available online.

A version of this article originally appeared on Medscape.com.

Roughly 3.7 million adults have a history of schizophrenia spectrum disorders – a figure two to three times higher than previously assumed, according to the first study to estimate the national prevalence of schizophrenia spectrum disorders.

This finding is “especially important,” given that people with schizophrenia spectrum disorders experience “high levels of disability that present significant challenges in all aspects of their life,” principal investigator Heather Ringeisen, PhD, with RTI International, a nonprofit research institute based on Research Triangle Park, N.C., said in a statement.

The results “highlight the need to improve systems of care and access to treatment for people with schizophrenia and other mental health disorders,” added co–principal investigator Mark J. Edlund, MD, PhD, also with RTI.

The study also found that prevalence rates of many other nonpsychotic disorders were generally within an expected range in light of findings from prior research – with three exceptions.

Rates of major depressive disorder (MDD), generalized anxiety disorder (GAD), and obsessive-compulsive disorder (OCD) were higher than reported in past nationally representative samples.

The new data come from the Mental and Substance Use Disorder Prevalence Study (MDPS), a pilot program funded by the Substance Abuse and Mental Health Services Administration (SAMHSA).

A nationally representative sample of 5,679 adults aged 18-65 residing in U.S. households, prisons, homeless shelters, and state psychiatric hospitals were interviewed, virtually or in person, between October 2020 and October 2022.

The research team used a population-based version of the Structured Clinical Interview of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; SCID-5) for mental health and substance use disorder diagnostic assessment.

Among the key findings in the report:

• Nearly 2% of adults (about 3.7 million) had a lifetime history of schizophrenia spectrum disorders, which include schizophrenia, schizoaffective disorder, and schizophreniform disorder.
• Roughly 2.5 million adults (1.2%) met diagnostic criteria for a schizophrenia spectrum disorder in the past year.
• The two most common mental disorders among adults were MDD (15.5%, or about 31.4 million) and GAD (10.0%, or about 20.2 million).
• Approximately 8.2 million adults (4.1%) had past-year posttraumatic stress disorder, about 5.0 million (2.5%) had OCD, and roughly 3.1 million (1.5%) had bipolar I disorder.
• Alcohol use disorder (AUD) was the most common substance use disorder among adults aged 18-65; roughly 13.4 million adults (6.7%) met criteria for AUD in the past year.
• About 7.7 million adults (3.8%) had cannabis use disorder, about 3.2 million (1.6%) had stimulant use disorder, and about 1 million (0.5%) had opioid use disorder.

Multiple comorbidities

The data also show that one in four adults had at least one mental health disorder in the past year, most commonly MDD and GAD.

About 11% of adults met the criteria for at least one substance use disorder, with AUD and cannabis use disorder the most common.

In addition, an estimated 11 million adults aged 18-65 had both a mental health disorder and a substance use disorder in the past year.

Encouragingly, the findings suggest that more individuals are seeking and accessing treatment compared with previous studies, the authors noted; 61% of adults with a mental health disorder reported having at least one visit with a treatment provider in the past year.

However, considerable treatment gaps still exist for the most common mental health disorders, they reported. Within the past year, more than 40% of adults with MDD and more than 30% of those with GAD did not receive any treatment services.

The full report is available online.

A version of this article originally appeared on Medscape.com.

Roughly 3.7 million adults have a history of schizophrenia spectrum disorders – a figure two to three times higher than previously assumed, according to the first study to estimate the national prevalence of schizophrenia spectrum disorders.

This finding is “especially important,” given that people with schizophrenia spectrum disorders experience “high levels of disability that present significant challenges in all aspects of their life,” principal investigator Heather Ringeisen, PhD, with RTI International, a nonprofit research institute based on Research Triangle Park, N.C., said in a statement.

The results “highlight the need to improve systems of care and access to treatment for people with schizophrenia and other mental health disorders,” added co–principal investigator Mark J. Edlund, MD, PhD, also with RTI.

The study also found that prevalence rates of many other nonpsychotic disorders were generally within an expected range in light of findings from prior research – with three exceptions.

Rates of major depressive disorder (MDD), generalized anxiety disorder (GAD), and obsessive-compulsive disorder (OCD) were higher than reported in past nationally representative samples.

The new data come from the Mental and Substance Use Disorder Prevalence Study (MDPS), a pilot program funded by the Substance Abuse and Mental Health Services Administration (SAMHSA).

A nationally representative sample of 5,679 adults aged 18-65 residing in U.S. households, prisons, homeless shelters, and state psychiatric hospitals were interviewed, virtually or in person, between October 2020 and October 2022.

The research team used a population-based version of the Structured Clinical Interview of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; SCID-5) for mental health and substance use disorder diagnostic assessment.

Among the key findings in the report:

• Nearly 2% of adults (about 3.7 million) had a lifetime history of schizophrenia spectrum disorders, which include schizophrenia, schizoaffective disorder, and schizophreniform disorder.
• Roughly 2.5 million adults (1.2%) met diagnostic criteria for a schizophrenia spectrum disorder in the past year.
• The two most common mental disorders among adults were MDD (15.5%, or about 31.4 million) and GAD (10.0%, or about 20.2 million).
• Approximately 8.2 million adults (4.1%) had past-year posttraumatic stress disorder, about 5.0 million (2.5%) had OCD, and roughly 3.1 million (1.5%) had bipolar I disorder.
• Alcohol use disorder (AUD) was the most common substance use disorder among adults aged 18-65; roughly 13.4 million adults (6.7%) met criteria for AUD in the past year.
• About 7.7 million adults (3.8%) had cannabis use disorder, about 3.2 million (1.6%) had stimulant use disorder, and about 1 million (0.5%) had opioid use disorder.

Multiple comorbidities

The data also show that one in four adults had at least one mental health disorder in the past year, most commonly MDD and GAD.

About 11% of adults met the criteria for at least one substance use disorder, with AUD and cannabis use disorder the most common.

In addition, an estimated 11 million adults aged 18-65 had both a mental health disorder and a substance use disorder in the past year.

Encouragingly, the findings suggest that more individuals are seeking and accessing treatment compared with previous studies, the authors noted; 61% of adults with a mental health disorder reported having at least one visit with a treatment provider in the past year.

However, considerable treatment gaps still exist for the most common mental health disorders, they reported. Within the past year, more than 40% of adults with MDD and more than 30% of those with GAD did not receive any treatment services.

The full report is available online.

A version of this article originally appeared on Medscape.com.