Movement Disorders

The novel drug bremelanotide shows promise in acquired female hypoactive sexual desire disorder, according to the results of two randomized, controlled trials and a 52-week open-label extension study published online in Obstetrics & Gynecology.

Bremelanotide, which received Food and Drug Administration approval for this indication in June 2019, is an analog of the endogenous neuropeptide alpha-melanocyte-stimulating hormone.

Two separate, identically designed phase 3 studies (RECONNECT) were performed by Sheryl Kingsburg, MD, of the Cleveland Medical Center, and associates. Combined, 1,267 premenopausal women in monogamous relationships with acquired hypoactive sexual desire disorder were randomized to bremelanotide or placebo. Women in the treatment arm had significant improvement in female sexual function index–desire domain (FSFI-D) scores from baseline to week 24 (integrated studies: 0.35; P less than .001; effect size, 0.39), compared with placebo. They also experienced significant improvement in the FSFI-desire/arousal/orgasm (FSFI-DAO) domain (integrated studies: –0.33; P less than .001; effect size, 0.27).

The most common adverse events were nausea (integrated: 40% versus 1% in placebo), flushing (20% versus 0.3%), and headache (11% versus 2%). Overall, 77% in the treatment group reported a treatment-emergent adverse event, compared with 58% in the placebo group.

The open-label follow-up study was led by James Simon, MD, of George Washington University and IntimMedicine Specialists, Washington. Of the 684 participants who opted to enter the extension study, 40% completed it. In those who received bremelanotide during the randomized trial, the change in FSFI-D scores from baseline to the end of the open-label study ranged from 1.25 to 1.30, while the change in FSFI-DAO ranged from –1.4 to –1.7. In patients originally on placebo, the changes were 0.70-0.77 and –0.9, respectively.

Both groups surpassed the minimally clinically important difference for the FSFI-D score, which is considered to be 0.6.

“Patients switching from placebo experienced a higher incidence of adverse events than those continuing on bremelanotide during the open-label extension (79% versus 63%, respectively),” Dr. Simon and associates said.

The treatment is subcutaneous and can be self-administered up to about 45 minutes before a sexual event, no more than once during a 24-hour period, and no more than 8 doses per month, according to an FDA press release. The drug is contraindicated for women with cardiovascular disease or uncontrolled hypertension due to observations of transiently, slightly increased blood pressure.

The trials were funded by Palatin Technologies and AMAG Pharmaceuticals. The authors and coauthors have extensive financial relationships with pharmaceutical companies. Dr. Carson reported no financial conflicts.

SOURCE: Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003500; Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003514.

The novel drug bremelanotide shows promise in acquired female hypoactive sexual desire disorder, according to the results of two randomized, controlled trials and a 52-week open-label extension study published online in Obstetrics & Gynecology.

Bremelanotide, which received Food and Drug Administration approval for this indication in June 2019, is an analog of the endogenous neuropeptide alpha-melanocyte-stimulating hormone.

Two separate, identically designed phase 3 studies (RECONNECT) were performed by Sheryl Kingsburg, MD, of the Cleveland Medical Center, and associates. Combined, 1,267 premenopausal women in monogamous relationships with acquired hypoactive sexual desire disorder were randomized to bremelanotide or placebo. Women in the treatment arm had significant improvement in female sexual function index–desire domain (FSFI-D) scores from baseline to week 24 (integrated studies: 0.35; P less than .001; effect size, 0.39), compared with placebo. They also experienced significant improvement in the FSFI-desire/arousal/orgasm (FSFI-DAO) domain (integrated studies: –0.33; P less than .001; effect size, 0.27).

The most common adverse events were nausea (integrated: 40% versus 1% in placebo), flushing (20% versus 0.3%), and headache (11% versus 2%). Overall, 77% in the treatment group reported a treatment-emergent adverse event, compared with 58% in the placebo group.

The open-label follow-up study was led by James Simon, MD, of George Washington University and IntimMedicine Specialists, Washington. Of the 684 participants who opted to enter the extension study, 40% completed it. In those who received bremelanotide during the randomized trial, the change in FSFI-D scores from baseline to the end of the open-label study ranged from 1.25 to 1.30, while the change in FSFI-DAO ranged from –1.4 to –1.7. In patients originally on placebo, the changes were 0.70-0.77 and –0.9, respectively.

Both groups surpassed the minimally clinically important difference for the FSFI-D score, which is considered to be 0.6.

“Patients switching from placebo experienced a higher incidence of adverse events than those continuing on bremelanotide during the open-label extension (79% versus 63%, respectively),” Dr. Simon and associates said.

The treatment is subcutaneous and can be self-administered up to about 45 minutes before a sexual event, no more than once during a 24-hour period, and no more than 8 doses per month, according to an FDA press release. The drug is contraindicated for women with cardiovascular disease or uncontrolled hypertension due to observations of transiently, slightly increased blood pressure.

The trials were funded by Palatin Technologies and AMAG Pharmaceuticals. The authors and coauthors have extensive financial relationships with pharmaceutical companies. Dr. Carson reported no financial conflicts.

SOURCE: Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003500; Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003514.

The novel drug bremelanotide shows promise in acquired female hypoactive sexual desire disorder, according to the results of two randomized, controlled trials and a 52-week open-label extension study published online in Obstetrics & Gynecology.

Bremelanotide, which received Food and Drug Administration approval for this indication in June 2019, is an analog of the endogenous neuropeptide alpha-melanocyte-stimulating hormone.

Two separate, identically designed phase 3 studies (RECONNECT) were performed by Sheryl Kingsburg, MD, of the Cleveland Medical Center, and associates. Combined, 1,267 premenopausal women in monogamous relationships with acquired hypoactive sexual desire disorder were randomized to bremelanotide or placebo. Women in the treatment arm had significant improvement in female sexual function index–desire domain (FSFI-D) scores from baseline to week 24 (integrated studies: 0.35; P less than .001; effect size, 0.39), compared with placebo. They also experienced significant improvement in the FSFI-desire/arousal/orgasm (FSFI-DAO) domain (integrated studies: –0.33; P less than .001; effect size, 0.27).

The most common adverse events were nausea (integrated: 40% versus 1% in placebo), flushing (20% versus 0.3%), and headache (11% versus 2%). Overall, 77% in the treatment group reported a treatment-emergent adverse event, compared with 58% in the placebo group.

The open-label follow-up study was led by James Simon, MD, of George Washington University and IntimMedicine Specialists, Washington. Of the 684 participants who opted to enter the extension study, 40% completed it. In those who received bremelanotide during the randomized trial, the change in FSFI-D scores from baseline to the end of the open-label study ranged from 1.25 to 1.30, while the change in FSFI-DAO ranged from –1.4 to –1.7. In patients originally on placebo, the changes were 0.70-0.77 and –0.9, respectively.

Both groups surpassed the minimally clinically important difference for the FSFI-D score, which is considered to be 0.6.

“Patients switching from placebo experienced a higher incidence of adverse events than those continuing on bremelanotide during the open-label extension (79% versus 63%, respectively),” Dr. Simon and associates said.

The treatment is subcutaneous and can be self-administered up to about 45 minutes before a sexual event, no more than once during a 24-hour period, and no more than 8 doses per month, according to an FDA press release. The drug is contraindicated for women with cardiovascular disease or uncontrolled hypertension due to observations of transiently, slightly increased blood pressure.

The trials were funded by Palatin Technologies and AMAG Pharmaceuticals. The authors and coauthors have extensive financial relationships with pharmaceutical companies. Dr. Carson reported no financial conflicts.

SOURCE: Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003500; Obstet Gynecol. 2019 Oct 8. doi: 10.1097/AOG.0000000000003514.

The Food and Drug Administration has approved onabotulinumtoxinA (Botox) for treatment of pediatric lower limb spasticity in patients aged 2-17 years, excluding those in whom it is associated with cerebral palsy, according to an announcement from Allergan.

Olivier Le Moal/Getty Images

The approval is based on a phase 3 study evaluating safety and efficacy in more than 300 patients with lower limb spasticity. Although patients with cerebral palsy were included in the study, they’re excluded from this indication. Orphan Drug Exclusivity prevents it from being indicated for lower limb spasticity in cerebral palsy because abobotulinumtoxinA (Dysport) already has marketing exclusivity for the indication. Botox also is indicated for children aged 2-17 years of age with upper limb spasticity, as well as nine other indications.

OnabotulinumtoxinA comes with warnings, including problems of swallowing, speaking, or breathing and even risk of spread of the toxin. It also may cause loss of strength or general muscle weakness, vision problems, or dizziness within hours or weeks of administration. Serious and sometimes immediate allergic reactions have been reported. Patients and health care professionals should discuss various concerns before treatment, including whether the patient has recently received antibiotics by injection, or has taken muscle relaxants, allergy or cold medicine, sleep medicine, and aspirinlike products or blood thinners. It’s important to note that the dose of onabotulinumtoxinA is not the same as that for other botulinum toxin products. The full prescribing information is available on the Allergan website.

cpalmer@mdedge.com

The Food and Drug Administration has approved onabotulinumtoxinA (Botox) for treatment of pediatric lower limb spasticity in patients aged 2-17 years, excluding those in whom it is associated with cerebral palsy, according to an announcement from Allergan.

Olivier Le Moal/Getty Images

The approval is based on a phase 3 study evaluating safety and efficacy in more than 300 patients with lower limb spasticity. Although patients with cerebral palsy were included in the study, they’re excluded from this indication. Orphan Drug Exclusivity prevents it from being indicated for lower limb spasticity in cerebral palsy because abobotulinumtoxinA (Dysport) already has marketing exclusivity for the indication. Botox also is indicated for children aged 2-17 years of age with upper limb spasticity, as well as nine other indications.

OnabotulinumtoxinA comes with warnings, including problems of swallowing, speaking, or breathing and even risk of spread of the toxin. It also may cause loss of strength or general muscle weakness, vision problems, or dizziness within hours or weeks of administration. Serious and sometimes immediate allergic reactions have been reported. Patients and health care professionals should discuss various concerns before treatment, including whether the patient has recently received antibiotics by injection, or has taken muscle relaxants, allergy or cold medicine, sleep medicine, and aspirinlike products or blood thinners. It’s important to note that the dose of onabotulinumtoxinA is not the same as that for other botulinum toxin products. The full prescribing information is available on the Allergan website.

cpalmer@mdedge.com

The Food and Drug Administration has approved onabotulinumtoxinA (Botox) for treatment of pediatric lower limb spasticity in patients aged 2-17 years, excluding those in whom it is associated with cerebral palsy, according to an announcement from Allergan.

Olivier Le Moal/Getty Images

The approval is based on a phase 3 study evaluating safety and efficacy in more than 300 patients with lower limb spasticity. Although patients with cerebral palsy were included in the study, they’re excluded from this indication. Orphan Drug Exclusivity prevents it from being indicated for lower limb spasticity in cerebral palsy because abobotulinumtoxinA (Dysport) already has marketing exclusivity for the indication. Botox also is indicated for children aged 2-17 years of age with upper limb spasticity, as well as nine other indications.

OnabotulinumtoxinA comes with warnings, including problems of swallowing, speaking, or breathing and even risk of spread of the toxin. It also may cause loss of strength or general muscle weakness, vision problems, or dizziness within hours or weeks of administration. Serious and sometimes immediate allergic reactions have been reported. Patients and health care professionals should discuss various concerns before treatment, including whether the patient has recently received antibiotics by injection, or has taken muscle relaxants, allergy or cold medicine, sleep medicine, and aspirinlike products or blood thinners. It’s important to note that the dose of onabotulinumtoxinA is not the same as that for other botulinum toxin products. The full prescribing information is available on the Allergan website.

cpalmer@mdedge.com

Patients with bipolar disorder may be at increased risk of Parkinson’s disease in later life, according to a systematic review and meta-analysis published in JAMA Neurology.

Patrícia R. Faustino, MD, from the faculty of medicine at the University of Lisboa (Portgual), and coauthors reviewed and analyzed seven articles – four cohort studies and three cross-sectional studies – that reported data on idiopathic Parkinson’s disease in patients with bipolar disorder, compared with those without. The meta-analysis found that individuals with a previous diagnosis of bipolar disorder had a 235% higher risk of being later diagnosed with Parkinson’s disease. Even after removing studies with a high risk of bias, the risk was still 3.21 times higher in those with bipolar disorder, compared with those without.

“The pathophysiological rationale between bipolar disorder and Parkinson’s disease might be explained by the dopamine dysregulation hypothesis, which states that the cyclical process of bipolar disorder in manic states leads to a down-regulation of dopamine receptor sensitivity (depression phase), which is later compensated by up-regulation (manic state),” the authors wrote. “Over time, this phenomenon may lead to an overall reduction of dopaminergic activity, the prototypical Parkinson’s disease state.”

Subgroup analysis revealed that subgroups with shorter follow-up periods – less than 9 years – had a greater increase in the risk of a later Parkinson’s disease diagnosis. The authors noted that this could represent misdiagnosis of parkinsonism – possibly drug induced – as Parkinson’s disease. The researchers also raised the possibility that the increased risk of Parkinson’s disease in patients with bipolar disorder could relate to long-term lithium use, rather than being a causal relationship. “However, treatment with lithium is foundational in bipolar disorder, and so to separate the causal effect from a potential confounder would be particularly difficult,” they wrote.

One of the studies included did explore the use of lithium, and found that lithium monotherapy was associated with a significant increase in the risk of being diagnosed with Parkinson’s disease or taking antiparkinsonism medication, compared with antidepressant therapy. However the authors commented that the diagnostic code may not differentiate Parkinson’s disease from other causes of parkinsonism.

Given their findings, the authors suggested that, if patients with bipolar disorder present with parkinsonism features, it may not necessarily be drug induced. In these patients, they recommended an investigation for Parkinson’s disease, perhaps using functional neuroimaging “as Parkinson’s disease classically presents with nigrostriatal degeneration while drug-induced parkinsonism does not.”

Two authors declared grants and personal fees from the pharmaceutical sector. No other conflicts of interest were reported.

SOURCE: Faustino PR et al. JAMA Neurol. 2019 Oct 14. doi: 10.1001/jamaneurol.2019.3446.

Patients with bipolar disorder may be at increased risk of Parkinson’s disease in later life, according to a systematic review and meta-analysis published in JAMA Neurology.

Patrícia R. Faustino, MD, from the faculty of medicine at the University of Lisboa (Portgual), and coauthors reviewed and analyzed seven articles – four cohort studies and three cross-sectional studies – that reported data on idiopathic Parkinson’s disease in patients with bipolar disorder, compared with those without. The meta-analysis found that individuals with a previous diagnosis of bipolar disorder had a 235% higher risk of being later diagnosed with Parkinson’s disease. Even after removing studies with a high risk of bias, the risk was still 3.21 times higher in those with bipolar disorder, compared with those without.

“The pathophysiological rationale between bipolar disorder and Parkinson’s disease might be explained by the dopamine dysregulation hypothesis, which states that the cyclical process of bipolar disorder in manic states leads to a down-regulation of dopamine receptor sensitivity (depression phase), which is later compensated by up-regulation (manic state),” the authors wrote. “Over time, this phenomenon may lead to an overall reduction of dopaminergic activity, the prototypical Parkinson’s disease state.”

Subgroup analysis revealed that subgroups with shorter follow-up periods – less than 9 years – had a greater increase in the risk of a later Parkinson’s disease diagnosis. The authors noted that this could represent misdiagnosis of parkinsonism – possibly drug induced – as Parkinson’s disease. The researchers also raised the possibility that the increased risk of Parkinson’s disease in patients with bipolar disorder could relate to long-term lithium use, rather than being a causal relationship. “However, treatment with lithium is foundational in bipolar disorder, and so to separate the causal effect from a potential confounder would be particularly difficult,” they wrote.

One of the studies included did explore the use of lithium, and found that lithium monotherapy was associated with a significant increase in the risk of being diagnosed with Parkinson’s disease or taking antiparkinsonism medication, compared with antidepressant therapy. However the authors commented that the diagnostic code may not differentiate Parkinson’s disease from other causes of parkinsonism.

Given their findings, the authors suggested that, if patients with bipolar disorder present with parkinsonism features, it may not necessarily be drug induced. In these patients, they recommended an investigation for Parkinson’s disease, perhaps using functional neuroimaging “as Parkinson’s disease classically presents with nigrostriatal degeneration while drug-induced parkinsonism does not.”

Two authors declared grants and personal fees from the pharmaceutical sector. No other conflicts of interest were reported.

SOURCE: Faustino PR et al. JAMA Neurol. 2019 Oct 14. doi: 10.1001/jamaneurol.2019.3446.

Patients with bipolar disorder may be at increased risk of Parkinson’s disease in later life, according to a systematic review and meta-analysis published in JAMA Neurology.

Patrícia R. Faustino, MD, from the faculty of medicine at the University of Lisboa (Portgual), and coauthors reviewed and analyzed seven articles – four cohort studies and three cross-sectional studies – that reported data on idiopathic Parkinson’s disease in patients with bipolar disorder, compared with those without. The meta-analysis found that individuals with a previous diagnosis of bipolar disorder had a 235% higher risk of being later diagnosed with Parkinson’s disease. Even after removing studies with a high risk of bias, the risk was still 3.21 times higher in those with bipolar disorder, compared with those without.

“The pathophysiological rationale between bipolar disorder and Parkinson’s disease might be explained by the dopamine dysregulation hypothesis, which states that the cyclical process of bipolar disorder in manic states leads to a down-regulation of dopamine receptor sensitivity (depression phase), which is later compensated by up-regulation (manic state),” the authors wrote. “Over time, this phenomenon may lead to an overall reduction of dopaminergic activity, the prototypical Parkinson’s disease state.”

Subgroup analysis revealed that subgroups with shorter follow-up periods – less than 9 years – had a greater increase in the risk of a later Parkinson’s disease diagnosis. The authors noted that this could represent misdiagnosis of parkinsonism – possibly drug induced – as Parkinson’s disease. The researchers also raised the possibility that the increased risk of Parkinson’s disease in patients with bipolar disorder could relate to long-term lithium use, rather than being a causal relationship. “However, treatment with lithium is foundational in bipolar disorder, and so to separate the causal effect from a potential confounder would be particularly difficult,” they wrote.

One of the studies included did explore the use of lithium, and found that lithium monotherapy was associated with a significant increase in the risk of being diagnosed with Parkinson’s disease or taking antiparkinsonism medication, compared with antidepressant therapy. However the authors commented that the diagnostic code may not differentiate Parkinson’s disease from other causes of parkinsonism.

Given their findings, the authors suggested that, if patients with bipolar disorder present with parkinsonism features, it may not necessarily be drug induced. In these patients, they recommended an investigation for Parkinson’s disease, perhaps using functional neuroimaging “as Parkinson’s disease classically presents with nigrostriatal degeneration while drug-induced parkinsonism does not.”

Two authors declared grants and personal fees from the pharmaceutical sector. No other conflicts of interest were reported.

SOURCE: Faustino PR et al. JAMA Neurol. 2019 Oct 14. doi: 10.1001/jamaneurol.2019.3446.

The Food and Drug Administration has expanded the indication of abobotulinumtoxinA (Dysport) for upper-limb spasticity to include patients aged 2 years and older, according to a release from Ipsen. This botulinum toxin product received approval for this indication in adults in 2015 and approval for lower-limb spasticity in patients aged 2 years and older in 2016. Notably, Orphan Drug Exclusivity prevents it from being indicated for patients with cerebral palsy because another botulinum toxin product, onabotulinumtoxinA (Botox), already was approved for the indication in June 2019.

Olivier Le Moal/Getty Images

Spasticity affects the muscles and joints of extremities, especially in growing children, and is usually caused by nerve damage, such as head trauma or spinal cord injury. The degree of spasticity can vary from mild muscle stiffness to severe, painful, and uncontrollable muscle spasms.

AbobotulinumtoxinA was evaluated for upper-limb spasticity in a phase 3, randomized, double-blind, low-dose controlled, multicenter study; the study enrolled 210 children aged 2-17 years with the condition and a Modified Ashworth Scale grade 2 or greater for elbow and wrist flexors. The children were randomized 1:1:1 to injections of either 8 units/kg, 16 units/kg, or 2 units/kg into the elbow flexors and wrist flexors. At 6 weeks, there were statistically significant improvements in Modified Ashworth Scale grade, the primary endpoint, with least-square mean changes from baseline of –2.0, –2.3, and –1.6, respectively.

AbobotulinumtoxinA and all other botulinum toxin products carry a boxed warning, the most serious warning the FDA issues. This warning refers to risk of botulism-like symptoms caused by the botulinum toxin spreading away from the injection area; these symptoms can included sometimes life-threatening difficulty swallowing or breathing. AbobotulinumtoxinA is contraindicated in patients with known hypersensitivity to any botulinum toxin or any of the components, those with presence of infection at proposed injection site(s), and those with known allergy to cow’s milk protein. It is also important to note that botulinum toxin preparations are not interchangeable; the potency units of one are not the same as those of another. Full prescribing information can be found on the Ipsen website.
 

cpalmer@mdedge.com

The Food and Drug Administration has expanded the indication of abobotulinumtoxinA (Dysport) for upper-limb spasticity to include patients aged 2 years and older, according to a release from Ipsen. This botulinum toxin product received approval for this indication in adults in 2015 and approval for lower-limb spasticity in patients aged 2 years and older in 2016. Notably, Orphan Drug Exclusivity prevents it from being indicated for patients with cerebral palsy because another botulinum toxin product, onabotulinumtoxinA (Botox), already was approved for the indication in June 2019.

Olivier Le Moal/Getty Images

Spasticity affects the muscles and joints of extremities, especially in growing children, and is usually caused by nerve damage, such as head trauma or spinal cord injury. The degree of spasticity can vary from mild muscle stiffness to severe, painful, and uncontrollable muscle spasms.

AbobotulinumtoxinA was evaluated for upper-limb spasticity in a phase 3, randomized, double-blind, low-dose controlled, multicenter study; the study enrolled 210 children aged 2-17 years with the condition and a Modified Ashworth Scale grade 2 or greater for elbow and wrist flexors. The children were randomized 1:1:1 to injections of either 8 units/kg, 16 units/kg, or 2 units/kg into the elbow flexors and wrist flexors. At 6 weeks, there were statistically significant improvements in Modified Ashworth Scale grade, the primary endpoint, with least-square mean changes from baseline of –2.0, –2.3, and –1.6, respectively.

AbobotulinumtoxinA and all other botulinum toxin products carry a boxed warning, the most serious warning the FDA issues. This warning refers to risk of botulism-like symptoms caused by the botulinum toxin spreading away from the injection area; these symptoms can included sometimes life-threatening difficulty swallowing or breathing. AbobotulinumtoxinA is contraindicated in patients with known hypersensitivity to any botulinum toxin or any of the components, those with presence of infection at proposed injection site(s), and those with known allergy to cow’s milk protein. It is also important to note that botulinum toxin preparations are not interchangeable; the potency units of one are not the same as those of another. Full prescribing information can be found on the Ipsen website.
 

cpalmer@mdedge.com

The Food and Drug Administration has expanded the indication of abobotulinumtoxinA (Dysport) for upper-limb spasticity to include patients aged 2 years and older, according to a release from Ipsen. This botulinum toxin product received approval for this indication in adults in 2015 and approval for lower-limb spasticity in patients aged 2 years and older in 2016. Notably, Orphan Drug Exclusivity prevents it from being indicated for patients with cerebral palsy because another botulinum toxin product, onabotulinumtoxinA (Botox), already was approved for the indication in June 2019.

Olivier Le Moal/Getty Images

Spasticity affects the muscles and joints of extremities, especially in growing children, and is usually caused by nerve damage, such as head trauma or spinal cord injury. The degree of spasticity can vary from mild muscle stiffness to severe, painful, and uncontrollable muscle spasms.

AbobotulinumtoxinA was evaluated for upper-limb spasticity in a phase 3, randomized, double-blind, low-dose controlled, multicenter study; the study enrolled 210 children aged 2-17 years with the condition and a Modified Ashworth Scale grade 2 or greater for elbow and wrist flexors. The children were randomized 1:1:1 to injections of either 8 units/kg, 16 units/kg, or 2 units/kg into the elbow flexors and wrist flexors. At 6 weeks, there were statistically significant improvements in Modified Ashworth Scale grade, the primary endpoint, with least-square mean changes from baseline of –2.0, –2.3, and –1.6, respectively.

AbobotulinumtoxinA and all other botulinum toxin products carry a boxed warning, the most serious warning the FDA issues. This warning refers to risk of botulism-like symptoms caused by the botulinum toxin spreading away from the injection area; these symptoms can included sometimes life-threatening difficulty swallowing or breathing. AbobotulinumtoxinA is contraindicated in patients with known hypersensitivity to any botulinum toxin or any of the components, those with presence of infection at proposed injection site(s), and those with known allergy to cow’s milk protein. It is also important to note that botulinum toxin preparations are not interchangeable; the potency units of one are not the same as those of another. Full prescribing information can be found on the Ipsen website.
 

cpalmer@mdedge.com

The Food and Drug Administration on Aug. 27 approved Nourianz (istradefylline) tablets as an add-on treatment to levodopa/carbidopa in adult patients with Parkinson’s disease experiencing off episodes. During off episodes, patients’ medications do not work well, and symptoms such as tremor and difficulty walking increase.

bankrx/Getty Images

The effectiveness of Nourianz for this indication was shown in four 12-week placebo-controlled clinical studies that included 1,143 participants. In all four studies, patients treated with Nourianz experienced a statistically significant decrease from baseline in daily off time, compared with patients who received placebo.

The most common adverse reactions to istradefylline with an incidence of 5% or greater and occurring more frequently than with placebo were dyskinesia (15%, 17%, and 8%, for Nourianz 20 mg, 40 mg, and placebo, respectively), dizziness (3%, 6%, and 4%), constipation (5%, 6%, and 3%), nausea (4%, 6%, and 5%), hallucination (2%, 6%, and 3%), and insomnia (1%, 6%, and 4%). In clinical trials, 1% of patients treated with Nourianz 20 mg or 40 mg discontinued treatment because of dyskinesia, compared with no patients who received placebo.

In addition,one patient treated with Nourianz 40 mg experienced impulse control disorder, compared with no patients who received Nourianz 20 mg or placebo.

If hallucinations, psychotic behavior, or impulsive or compulsive behavior occurs, a dosage reduction or stoppage should be considered, according to the FDA. Use of Nourianz during pregnancy is not recommended, and women of childbearing potential should be advised to use contraception during treatment.

The maximum recommended dosage in patients taking strong CYP3A4 inhibitors is 20 mg once daily, and clinicians should avoid use of Nourianz with strong CYP3A4 inducers.

Istradefylline is the first adenosine A_2A receptor antagonist for use in Parkinson’s disease in the United States, and the drug provides patients with a novel nondopaminergic daily oral treatment option, according to a news release from Kyowa Kirin, the company that markets the drug.

Since 2013, istradefylline has been marketed at Nouriast in Japan, where it is indicated for the wearing-off phenomenon in patients with Parkinson’s disease who take preparations containing levodopa.

jremaly@mdedge.com

The Food and Drug Administration on Aug. 27 approved Nourianz (istradefylline) tablets as an add-on treatment to levodopa/carbidopa in adult patients with Parkinson’s disease experiencing off episodes. During off episodes, patients’ medications do not work well, and symptoms such as tremor and difficulty walking increase.

bankrx/Getty Images

The effectiveness of Nourianz for this indication was shown in four 12-week placebo-controlled clinical studies that included 1,143 participants. In all four studies, patients treated with Nourianz experienced a statistically significant decrease from baseline in daily off time, compared with patients who received placebo.

The most common adverse reactions to istradefylline with an incidence of 5% or greater and occurring more frequently than with placebo were dyskinesia (15%, 17%, and 8%, for Nourianz 20 mg, 40 mg, and placebo, respectively), dizziness (3%, 6%, and 4%), constipation (5%, 6%, and 3%), nausea (4%, 6%, and 5%), hallucination (2%, 6%, and 3%), and insomnia (1%, 6%, and 4%). In clinical trials, 1% of patients treated with Nourianz 20 mg or 40 mg discontinued treatment because of dyskinesia, compared with no patients who received placebo.

In addition,one patient treated with Nourianz 40 mg experienced impulse control disorder, compared with no patients who received Nourianz 20 mg or placebo.

If hallucinations, psychotic behavior, or impulsive or compulsive behavior occurs, a dosage reduction or stoppage should be considered, according to the FDA. Use of Nourianz during pregnancy is not recommended, and women of childbearing potential should be advised to use contraception during treatment.

The maximum recommended dosage in patients taking strong CYP3A4 inhibitors is 20 mg once daily, and clinicians should avoid use of Nourianz with strong CYP3A4 inducers.

Istradefylline is the first adenosine A_2A receptor antagonist for use in Parkinson’s disease in the United States, and the drug provides patients with a novel nondopaminergic daily oral treatment option, according to a news release from Kyowa Kirin, the company that markets the drug.

Since 2013, istradefylline has been marketed at Nouriast in Japan, where it is indicated for the wearing-off phenomenon in patients with Parkinson’s disease who take preparations containing levodopa.

jremaly@mdedge.com

The Food and Drug Administration on Aug. 27 approved Nourianz (istradefylline) tablets as an add-on treatment to levodopa/carbidopa in adult patients with Parkinson’s disease experiencing off episodes. During off episodes, patients’ medications do not work well, and symptoms such as tremor and difficulty walking increase.

bankrx/Getty Images

The effectiveness of Nourianz for this indication was shown in four 12-week placebo-controlled clinical studies that included 1,143 participants. In all four studies, patients treated with Nourianz experienced a statistically significant decrease from baseline in daily off time, compared with patients who received placebo.

The most common adverse reactions to istradefylline with an incidence of 5% or greater and occurring more frequently than with placebo were dyskinesia (15%, 17%, and 8%, for Nourianz 20 mg, 40 mg, and placebo, respectively), dizziness (3%, 6%, and 4%), constipation (5%, 6%, and 3%), nausea (4%, 6%, and 5%), hallucination (2%, 6%, and 3%), and insomnia (1%, 6%, and 4%). In clinical trials, 1% of patients treated with Nourianz 20 mg or 40 mg discontinued treatment because of dyskinesia, compared with no patients who received placebo.

In addition,one patient treated with Nourianz 40 mg experienced impulse control disorder, compared with no patients who received Nourianz 20 mg or placebo.

If hallucinations, psychotic behavior, or impulsive or compulsive behavior occurs, a dosage reduction or stoppage should be considered, according to the FDA. Use of Nourianz during pregnancy is not recommended, and women of childbearing potential should be advised to use contraception during treatment.

The maximum recommended dosage in patients taking strong CYP3A4 inhibitors is 20 mg once daily, and clinicians should avoid use of Nourianz with strong CYP3A4 inducers.

Istradefylline is the first adenosine A_2A receptor antagonist for use in Parkinson’s disease in the United States, and the drug provides patients with a novel nondopaminergic daily oral treatment option, according to a news release from Kyowa Kirin, the company that markets the drug.

Since 2013, istradefylline has been marketed at Nouriast in Japan, where it is indicated for the wearing-off phenomenon in patients with Parkinson’s disease who take preparations containing levodopa.

jremaly@mdedge.com

The progression, not just age of onset, of Huntington’s disease can be predicted by a measurable genetic factor, researchers have learned.

Huntington’s, an inherited neurodegenerative disease that affects motor function and cognition, is caused by an expansion of the CAG trinucleotide sequence on the huntingtin gene. Scientists have previously linked younger age at onset to a higher number of CAG repeats on the gene, but the association between these and the rate of progression after onset was poorly understood.

In research published online August 12 in JAMA Neurology, investigators linked the rate of progression – which, like age at onset, is highly variable in Huntington’s – to CAG repeat length. CAG repeat length was strongly associated with distinct patterns of brain damage, as well as clinical measures of cognitive and motor decline.

For their research, Douglas R. Langbehn, MD, PhD, of the University of Iowa, Iowa City, and colleagues used data from two longitudinal observational studies in gene carriers for Huntington’s and nonrelated controls. The researchers looked at data from 443 participants (56% female; mean age, 44.4 years) who were followed for a mean of 4 years, with more than 2,000 study visits across the multisite cohort. Neuropsychiatric testing and brain imaging were conducted annually, using composite scoring systems of the investigators’ design. These composite scores sought to be more sensitive by combining results from several validated clinical and imaging tests.

Age and speed of decline in total functional capacity tracked with more CAG repeats, the researchers found. For example, in people with 40 CAG repeats, the estimated mean age of initial motor-cognitive score change was 42.46 years; for those with 45 repeats, 26.65 years, and for people with 50 CAG repeats, 18.49 years. Higher repeats were seen significantly associated with accelerated, nonlinear decline on both clinical and brain-volume measures, except gray matter volume, according to principal component analyses conducted on the data.

“We derived a single summary measure capturing the motor-cognitive phenotype and showed that the accelerating progression of the phenotype with aging is highly CAG repeat length dependent (i.e., those with higher CAG decline earlier and faster). Contrary to some previous assertions, this CAG dependence continues well past the onset of clinical illness,” Dr. Langbehn and colleagues wrote in their analysis. “By characterizing these CAG repeat length–dependent disease trajectories, we provide insights into disease progression that may guide future therapeutic approaches and identify the most appropriate intervention ages to prevent clinical decline.”

Dr. Langbehn and colleagues acknowledged as a limitation of their study its likely exclusion of the sickest subjects because of the cohorts’ design. The CHDI Foundation funded the study. Of the 16 coauthors, 13 reported receiving funding from CHDI and/or from pharmaceutical manufacturers.

SOURCE: Langbehn et al. JAMA Neurol. 2019 Aug 12. doi: 10.1001/jamaneurol.2019.2328

The progression, not just age of onset, of Huntington’s disease can be predicted by a measurable genetic factor, researchers have learned.

Huntington’s, an inherited neurodegenerative disease that affects motor function and cognition, is caused by an expansion of the CAG trinucleotide sequence on the huntingtin gene. Scientists have previously linked younger age at onset to a higher number of CAG repeats on the gene, but the association between these and the rate of progression after onset was poorly understood.

In research published online August 12 in JAMA Neurology, investigators linked the rate of progression – which, like age at onset, is highly variable in Huntington’s – to CAG repeat length. CAG repeat length was strongly associated with distinct patterns of brain damage, as well as clinical measures of cognitive and motor decline.

For their research, Douglas R. Langbehn, MD, PhD, of the University of Iowa, Iowa City, and colleagues used data from two longitudinal observational studies in gene carriers for Huntington’s and nonrelated controls. The researchers looked at data from 443 participants (56% female; mean age, 44.4 years) who were followed for a mean of 4 years, with more than 2,000 study visits across the multisite cohort. Neuropsychiatric testing and brain imaging were conducted annually, using composite scoring systems of the investigators’ design. These composite scores sought to be more sensitive by combining results from several validated clinical and imaging tests.

Age and speed of decline in total functional capacity tracked with more CAG repeats, the researchers found. For example, in people with 40 CAG repeats, the estimated mean age of initial motor-cognitive score change was 42.46 years; for those with 45 repeats, 26.65 years, and for people with 50 CAG repeats, 18.49 years. Higher repeats were seen significantly associated with accelerated, nonlinear decline on both clinical and brain-volume measures, except gray matter volume, according to principal component analyses conducted on the data.

“We derived a single summary measure capturing the motor-cognitive phenotype and showed that the accelerating progression of the phenotype with aging is highly CAG repeat length dependent (i.e., those with higher CAG decline earlier and faster). Contrary to some previous assertions, this CAG dependence continues well past the onset of clinical illness,” Dr. Langbehn and colleagues wrote in their analysis. “By characterizing these CAG repeat length–dependent disease trajectories, we provide insights into disease progression that may guide future therapeutic approaches and identify the most appropriate intervention ages to prevent clinical decline.”

Dr. Langbehn and colleagues acknowledged as a limitation of their study its likely exclusion of the sickest subjects because of the cohorts’ design. The CHDI Foundation funded the study. Of the 16 coauthors, 13 reported receiving funding from CHDI and/or from pharmaceutical manufacturers.

SOURCE: Langbehn et al. JAMA Neurol. 2019 Aug 12. doi: 10.1001/jamaneurol.2019.2328

The progression, not just age of onset, of Huntington’s disease can be predicted by a measurable genetic factor, researchers have learned.

Huntington’s, an inherited neurodegenerative disease that affects motor function and cognition, is caused by an expansion of the CAG trinucleotide sequence on the huntingtin gene. Scientists have previously linked younger age at onset to a higher number of CAG repeats on the gene, but the association between these and the rate of progression after onset was poorly understood.

In research published online August 12 in JAMA Neurology, investigators linked the rate of progression – which, like age at onset, is highly variable in Huntington’s – to CAG repeat length. CAG repeat length was strongly associated with distinct patterns of brain damage, as well as clinical measures of cognitive and motor decline.

For their research, Douglas R. Langbehn, MD, PhD, of the University of Iowa, Iowa City, and colleagues used data from two longitudinal observational studies in gene carriers for Huntington’s and nonrelated controls. The researchers looked at data from 443 participants (56% female; mean age, 44.4 years) who were followed for a mean of 4 years, with more than 2,000 study visits across the multisite cohort. Neuropsychiatric testing and brain imaging were conducted annually, using composite scoring systems of the investigators’ design. These composite scores sought to be more sensitive by combining results from several validated clinical and imaging tests.

Age and speed of decline in total functional capacity tracked with more CAG repeats, the researchers found. For example, in people with 40 CAG repeats, the estimated mean age of initial motor-cognitive score change was 42.46 years; for those with 45 repeats, 26.65 years, and for people with 50 CAG repeats, 18.49 years. Higher repeats were seen significantly associated with accelerated, nonlinear decline on both clinical and brain-volume measures, except gray matter volume, according to principal component analyses conducted on the data.

“We derived a single summary measure capturing the motor-cognitive phenotype and showed that the accelerating progression of the phenotype with aging is highly CAG repeat length dependent (i.e., those with higher CAG decline earlier and faster). Contrary to some previous assertions, this CAG dependence continues well past the onset of clinical illness,” Dr. Langbehn and colleagues wrote in their analysis. “By characterizing these CAG repeat length–dependent disease trajectories, we provide insights into disease progression that may guide future therapeutic approaches and identify the most appropriate intervention ages to prevent clinical decline.”

Dr. Langbehn and colleagues acknowledged as a limitation of their study its likely exclusion of the sickest subjects because of the cohorts’ design. The CHDI Foundation funded the study. Of the 16 coauthors, 13 reported receiving funding from CHDI and/or from pharmaceutical manufacturers.

SOURCE: Langbehn et al. JAMA Neurol. 2019 Aug 12. doi: 10.1001/jamaneurol.2019.2328

Differences in the prominence of motor, cognitive, and psychiatric symptoms of Huntington’s disease among individuals can be attributed to differences in gray and white matter structural alterations, according to a neuroimaging study of 43 Huntington’s disease gene carriers conducted by Clara Garcia-Gorro, PhD, of the Bellvitge Institute for Biomedical Research and Bellvitge Hospital, Barcelona, and colleagues.

Their work detected a common neurobiological basis for the carriers’ cognitive and motor symptoms in patterns of reductions in gray matter, cortical thickness, and white matter integrity in cognitive and motor networks. They also found that depressive symptoms were associated with imaging findings primarily characterized by reduced cortical thickness in limbic and paralimbic regions.

“These results are relevant in the context of clinical trials, since they could be used to define specific biomarkers for each symptom profile, even before clinical signs appear. Having more homogeneous groups would potentially increase the likelihood of detecting successful interventions and help to find individualized treatments that target specific cognitive, motor, and psychiatric disturbances,” the authors concluded.

jevans@mdedge.com

SOURCE: Garcia-Gorro C et al. Neuroimage Clin. 2019 Jun 15. doi: 10.1016/j.nicl.2019.101900.

Differences in the prominence of motor, cognitive, and psychiatric symptoms of Huntington’s disease among individuals can be attributed to differences in gray and white matter structural alterations, according to a neuroimaging study of 43 Huntington’s disease gene carriers conducted by Clara Garcia-Gorro, PhD, of the Bellvitge Institute for Biomedical Research and Bellvitge Hospital, Barcelona, and colleagues.

Their work detected a common neurobiological basis for the carriers’ cognitive and motor symptoms in patterns of reductions in gray matter, cortical thickness, and white matter integrity in cognitive and motor networks. They also found that depressive symptoms were associated with imaging findings primarily characterized by reduced cortical thickness in limbic and paralimbic regions.

“These results are relevant in the context of clinical trials, since they could be used to define specific biomarkers for each symptom profile, even before clinical signs appear. Having more homogeneous groups would potentially increase the likelihood of detecting successful interventions and help to find individualized treatments that target specific cognitive, motor, and psychiatric disturbances,” the authors concluded.

jevans@mdedge.com

SOURCE: Garcia-Gorro C et al. Neuroimage Clin. 2019 Jun 15. doi: 10.1016/j.nicl.2019.101900.

Differences in the prominence of motor, cognitive, and psychiatric symptoms of Huntington’s disease among individuals can be attributed to differences in gray and white matter structural alterations, according to a neuroimaging study of 43 Huntington’s disease gene carriers conducted by Clara Garcia-Gorro, PhD, of the Bellvitge Institute for Biomedical Research and Bellvitge Hospital, Barcelona, and colleagues.

Their work detected a common neurobiological basis for the carriers’ cognitive and motor symptoms in patterns of reductions in gray matter, cortical thickness, and white matter integrity in cognitive and motor networks. They also found that depressive symptoms were associated with imaging findings primarily characterized by reduced cortical thickness in limbic and paralimbic regions.

“These results are relevant in the context of clinical trials, since they could be used to define specific biomarkers for each symptom profile, even before clinical signs appear. Having more homogeneous groups would potentially increase the likelihood of detecting successful interventions and help to find individualized treatments that target specific cognitive, motor, and psychiatric disturbances,” the authors concluded.

jevans@mdedge.com

SOURCE: Garcia-Gorro C et al. Neuroimage Clin. 2019 Jun 15. doi: 10.1016/j.nicl.2019.101900.

Exposures to various types of anticholinergic medications were associated with a significantly increased risk of dementia in people aged 55 years or older in a large pharmacoepidemiologic study.

Ocskaymark/Thinkstock

“This study was designed to assess the association between cumulative anticholinergic drug use and risk of dementia in a large, representative British population,” wrote Carol A. C. Coupland, PhD, of the division of primary care at the University of Nottingham (England), and colleagues. The findings were published in JAMA Internal Medicine.

The researchers conducted a large nested case-control study that included 58,769 patients with dementia and 225,574 matched controls from the QResearch database in England. Each study participant was matched to five controls based on various characteristics, including sex, age, and calendar time, among others.

Prescription data related to 56 different drugs with strong anticholinergic properties, including antipsychotics, bladder antimuscarinics, antiepileptics, antiparkinson agents, and antidepressants were used to measure drug exposure. The study data were analyzed from 2016 to 2018.

“The primary exposure was the total standardized daily doses (TSDDs) of anticholinergic drugs prescribed in the 1 to 11 years prior to the date of diagnosis of dementia or equivalent date in matched controls,” Dr. Coupland and colleagues wrote.

After analysis, the researchers found that exposure to antipsychotics (adjusted odds ratio, 1.70), bladder antimuscarinics (aOR, 1.65), antiepileptics (aOR, 1.39), antiparkinson agents (aOR, 1.52), and anticholinergic antidepressants (aOR, 1.29) was associated with an increased risk of dementia after adjustment for confounding factors.

“Associations were stronger in [dementia] cases diagnosed before the age of 80 years,” the researchers noted.

However, antihistamine, antivertigo/antiemetic, skeletal muscle relaxant, gastrointestinal antispasmodic, antiarrhythmic, and antimuscarinic bronchodilator anticholinergic agents were not associated with any increased risk of dementia.

One key limitation of the study was the absence of medication compliance assessment, which could result in exposure misclassification. Dr. Coupland and colleagues acknowledged this could underestimate some associations with medication exposure.

The stronger risk of dementia found among people who had dementia before age 80 “indicates that anticholinergic drugs should be prescribed with caution in middle-aged and older people,” they concluded.

One question that remains from the current study is whether anticholinergic drugs are a definite modifiable risk factor for Alzheimer’s disease and related dementias, Noll L. Campbell, PharmD, of Purdue University, West Lafayette, Ind., and colleagues wrote in an editorial accompanying the study by Dr. Coupland and associates (JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0676).

While a pharmacologic basis for this association has been proposed, causation has yet to be established by means of prospective randomized studies. The current supposition is that deprescribing anticholinergic medications has the potential to positively effect cholinergic neurotransmission in certain regions of the brain, which could lead to improved cognitive functioning, and lower the likelihood of developing Alzheimer’s disease and related dementias, they wrote in the editorial.

However, the discontinuation of some anticholinergic agents may pose other risks, such as worsening pain or depressive symptoms, in addition to increasing the utilization of acute care facilities. As a result, high-quality, well-designed, randomized trials are needed to better understand the long-term effects of deprescribing anticholinergic medications. These trials would help inform clinicians, patients, and policymakers about the risks and benefits of deprescribing interventions, Dr. Campbell and coauthors said.

The study was supported by the National Institute for Health Research and the University of Nottingham. The authors reported financial affiliations with ClinRisk Ltd. The authors of the editorial reported receiving support from the National Institute on Aging and the Agency for Healthcare Research and Quality. Dr. Campbell reported receiving personal fees from Astellas Pharma US.

SOURCE: Coupland C et al. JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0677

Exposures to various types of anticholinergic medications were associated with a significantly increased risk of dementia in people aged 55 years or older in a large pharmacoepidemiologic study.

Ocskaymark/Thinkstock

“This study was designed to assess the association between cumulative anticholinergic drug use and risk of dementia in a large, representative British population,” wrote Carol A. C. Coupland, PhD, of the division of primary care at the University of Nottingham (England), and colleagues. The findings were published in JAMA Internal Medicine.

The researchers conducted a large nested case-control study that included 58,769 patients with dementia and 225,574 matched controls from the QResearch database in England. Each study participant was matched to five controls based on various characteristics, including sex, age, and calendar time, among others.

Prescription data related to 56 different drugs with strong anticholinergic properties, including antipsychotics, bladder antimuscarinics, antiepileptics, antiparkinson agents, and antidepressants were used to measure drug exposure. The study data were analyzed from 2016 to 2018.

“The primary exposure was the total standardized daily doses (TSDDs) of anticholinergic drugs prescribed in the 1 to 11 years prior to the date of diagnosis of dementia or equivalent date in matched controls,” Dr. Coupland and colleagues wrote.

After analysis, the researchers found that exposure to antipsychotics (adjusted odds ratio, 1.70), bladder antimuscarinics (aOR, 1.65), antiepileptics (aOR, 1.39), antiparkinson agents (aOR, 1.52), and anticholinergic antidepressants (aOR, 1.29) was associated with an increased risk of dementia after adjustment for confounding factors.

“Associations were stronger in [dementia] cases diagnosed before the age of 80 years,” the researchers noted.

However, antihistamine, antivertigo/antiemetic, skeletal muscle relaxant, gastrointestinal antispasmodic, antiarrhythmic, and antimuscarinic bronchodilator anticholinergic agents were not associated with any increased risk of dementia.

One key limitation of the study was the absence of medication compliance assessment, which could result in exposure misclassification. Dr. Coupland and colleagues acknowledged this could underestimate some associations with medication exposure.

The stronger risk of dementia found among people who had dementia before age 80 “indicates that anticholinergic drugs should be prescribed with caution in middle-aged and older people,” they concluded.

One question that remains from the current study is whether anticholinergic drugs are a definite modifiable risk factor for Alzheimer’s disease and related dementias, Noll L. Campbell, PharmD, of Purdue University, West Lafayette, Ind., and colleagues wrote in an editorial accompanying the study by Dr. Coupland and associates (JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0676).

While a pharmacologic basis for this association has been proposed, causation has yet to be established by means of prospective randomized studies. The current supposition is that deprescribing anticholinergic medications has the potential to positively effect cholinergic neurotransmission in certain regions of the brain, which could lead to improved cognitive functioning, and lower the likelihood of developing Alzheimer’s disease and related dementias, they wrote in the editorial.

However, the discontinuation of some anticholinergic agents may pose other risks, such as worsening pain or depressive symptoms, in addition to increasing the utilization of acute care facilities. As a result, high-quality, well-designed, randomized trials are needed to better understand the long-term effects of deprescribing anticholinergic medications. These trials would help inform clinicians, patients, and policymakers about the risks and benefits of deprescribing interventions, Dr. Campbell and coauthors said.

The study was supported by the National Institute for Health Research and the University of Nottingham. The authors reported financial affiliations with ClinRisk Ltd. The authors of the editorial reported receiving support from the National Institute on Aging and the Agency for Healthcare Research and Quality. Dr. Campbell reported receiving personal fees from Astellas Pharma US.

SOURCE: Coupland C et al. JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0677

Exposures to various types of anticholinergic medications were associated with a significantly increased risk of dementia in people aged 55 years or older in a large pharmacoepidemiologic study.

Ocskaymark/Thinkstock

“This study was designed to assess the association between cumulative anticholinergic drug use and risk of dementia in a large, representative British population,” wrote Carol A. C. Coupland, PhD, of the division of primary care at the University of Nottingham (England), and colleagues. The findings were published in JAMA Internal Medicine.

The researchers conducted a large nested case-control study that included 58,769 patients with dementia and 225,574 matched controls from the QResearch database in England. Each study participant was matched to five controls based on various characteristics, including sex, age, and calendar time, among others.

Prescription data related to 56 different drugs with strong anticholinergic properties, including antipsychotics, bladder antimuscarinics, antiepileptics, antiparkinson agents, and antidepressants were used to measure drug exposure. The study data were analyzed from 2016 to 2018.

“The primary exposure was the total standardized daily doses (TSDDs) of anticholinergic drugs prescribed in the 1 to 11 years prior to the date of diagnosis of dementia or equivalent date in matched controls,” Dr. Coupland and colleagues wrote.

After analysis, the researchers found that exposure to antipsychotics (adjusted odds ratio, 1.70), bladder antimuscarinics (aOR, 1.65), antiepileptics (aOR, 1.39), antiparkinson agents (aOR, 1.52), and anticholinergic antidepressants (aOR, 1.29) was associated with an increased risk of dementia after adjustment for confounding factors.

“Associations were stronger in [dementia] cases diagnosed before the age of 80 years,” the researchers noted.

However, antihistamine, antivertigo/antiemetic, skeletal muscle relaxant, gastrointestinal antispasmodic, antiarrhythmic, and antimuscarinic bronchodilator anticholinergic agents were not associated with any increased risk of dementia.

One key limitation of the study was the absence of medication compliance assessment, which could result in exposure misclassification. Dr. Coupland and colleagues acknowledged this could underestimate some associations with medication exposure.

The stronger risk of dementia found among people who had dementia before age 80 “indicates that anticholinergic drugs should be prescribed with caution in middle-aged and older people,” they concluded.

One question that remains from the current study is whether anticholinergic drugs are a definite modifiable risk factor for Alzheimer’s disease and related dementias, Noll L. Campbell, PharmD, of Purdue University, West Lafayette, Ind., and colleagues wrote in an editorial accompanying the study by Dr. Coupland and associates (JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0676).

While a pharmacologic basis for this association has been proposed, causation has yet to be established by means of prospective randomized studies. The current supposition is that deprescribing anticholinergic medications has the potential to positively effect cholinergic neurotransmission in certain regions of the brain, which could lead to improved cognitive functioning, and lower the likelihood of developing Alzheimer’s disease and related dementias, they wrote in the editorial.

However, the discontinuation of some anticholinergic agents may pose other risks, such as worsening pain or depressive symptoms, in addition to increasing the utilization of acute care facilities. As a result, high-quality, well-designed, randomized trials are needed to better understand the long-term effects of deprescribing anticholinergic medications. These trials would help inform clinicians, patients, and policymakers about the risks and benefits of deprescribing interventions, Dr. Campbell and coauthors said.

The study was supported by the National Institute for Health Research and the University of Nottingham. The authors reported financial affiliations with ClinRisk Ltd. The authors of the editorial reported receiving support from the National Institute on Aging and the Agency for Healthcare Research and Quality. Dr. Campbell reported receiving personal fees from Astellas Pharma US.

SOURCE: Coupland C et al. JAMA Intern Med. 2019 Jun 24. doi: 10.1001/jamainternmed.2019.0677

CSF levels of neurofilament light (NfL) are elevated in most neurologic conditions, according to an analysis published online ahead of print June 17 in JAMA Neurology. The biomarker has the potential to distinguish between frontotemporal dementia (FTD) and other dementia subtypes, as well as between Parkinson’s disease and atypical parkinsonian syndromes, said the investigators. It may be necessary to identify age- and sex-specific reference values for NfL, they added.

Neurologists have long understood CSF levels of NfL to be elevated in neurodegenerative conditions, but researchers previously had not compared these levels systematically among neurologic disorders. Similarly, the literature indicates a positive association between CSF NfL level and age in healthy controls, but this association has not been evaluated systematically in neurologic disorders. The resulting lack of clarity has impeded the use of NfL as a diagnostic biomarker.
 

A meta-analysis of CSF samples

Claire Bridel, MD, PhD, of the department of clinical chemistry at the VU University Medical Centre in Amsterdam and colleagues conducted a systematic review and meta-analysis to compare CSF levels of NfL among diagnoses, assess the associations of age and sex with NfL, and evaluate the potential of NfL as a diagnostic biomarker. The investigators searched PubMed for studies published between Jan. 1, 2006, and Jan. 1, 2016, that reported CSF levels of NfL in neurologic or psychiatric conditions or in healthy controls. They included only studies that used the same commercially available immunoassay that has been used in most studies since 2006. The literature indicates that this enzyme-linked immunosorbent assay is sensitive and robust. Dr. Bridel and colleagues contacted study authors and requested their individual-level data.

The investigators sorted the most common neurologic conditions into three groups of similar disorders. The first group included inflammatory conditions of the CNS, such as multiple sclerosis, clinically isolated syndrome (CIS), and optic neuritis. The second group included dementia syndromes (such as Alzheimer’s disease, FTD, vascular dementia, and dementia with Lewy bodies) and amyotrophic lateral sclerosis (ALS). The third category included parkinsonian syndromes such as Parkinson’s disease, Parkinson’s disease dementia, multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and corticobasal syndrome (CBS). The authors used generalized linear mixed-effects models to estimate the fixed effects of age, sex, and diagnosis on log-transformed NfL levels. They modeled cohort of origin as a random intercept.
 

NfL increased with age

Dr. Bridel and colleagues identified 153 relevant investigations, of which 44 met their inclusion criteria. The original investigators provided data sets for these studies, along with three previously unpublished data sets. The data sets included information from 10,059 participants (mean age, 59.7 years; 54.1% female). After excluding diagnostic categories with fewer than five observations per sex, Dr. Bridel and colleagues included data for 10,012 people in the analysis. In this population, the researchers identified 2,795 patients with inflammatory diseases of the CNS, 4,284 patients with dementia or predementia, 984 patients with parkinsonian disorders, and 1,332 healthy controls.

CSF level of NfL was elevated in most neurologic conditions, compared with healthy controls. The largest effect sizes were in cognitively impaired patients with HIV (21.36), patients with FTD/ALS (10.48), patients with ALS (7.58), and patients with Huntington’s disease (5.88).

In healthy controls, the level of NfL in CSF increased by 3.30% annually. The investigators also observed an association between age and CSF NfL level in people with subjective complaints, bipolar disorder, and most neurodegenerative conditions. They found no association, however, in patients with MS, HIV and cognitive impairment, and rapidly progressive neurodegenerative conditions (such as FTD, ALS, FTD/ALS, MSA, PSP, CBS, and Huntington’s disease). CSF level of NfL was 26.0% higher in men among healthy controls. This discrepancy also was observed in a minority of neurologic conditions, including MS, Alzheimer’s disease, vascular dementia, and Parkinson’s disease.

Mean CSF levels of NfL were similar between patients with inflammatory conditions of the CNS. Among dementias and related disorders, mean CNS level of NfL was significantly higher in FTD than in Alzheimer’s disease (2.08), vascular dementia (1.56), and dementia with Lewy bodies (2.50). Among parkinsonian syndromes, the mean CSF levels of NfL were higher in MSA, PSP, and CBS, compared with Parkinson’s disease.
 

Many factors influence NfL level in CSF

The association between CNS level of NfL with age among healthy controls “implies that age-specific reference values may be needed and that the diagnostic potential of CSF NfL may decrease with age,” said the researchers. The finding that CSF NfL level was higher in men in a minority of diagnoses has uncertain clinical significance, they added. Sex-specific reference values may be needed.

Dr. Bridel and colleagues found that age, sex, and cohort explained 46% of variation in CSF level of NfL, which suggests that many factors that determine this level have yet to be identified. Disease duration and disease severity could influence the CSF level of NfL, but the data sets that the investigators analyzed did not include this information.

Because CSF NfL level did not differ significantly between relapsing/remitting MS, secondary progressive MS, and primary progressive MS, this biomarker “may not differentiate acute inflammation-induced neuronal damage in the context of relapses from progressive neurodegeneration if the consequences of recent relapses or novel lesion formation are not considered,” said Dr. Bridel and colleagues. The findings do suggest, however, that CSF level of NfL can distinguish FTD from other dementias, as well as Parkinson’s disease from atypical parkinsonian syndromes. Furthermore, it is possible that the findings of this study can be translated to serum level of NfL, said the authors.

One of the study’s limitations was that diagnosis was based on clinical criteria, said Dr. Bridel and colleagues. In addition, the authors were unable to identify dementia of multifactorial origin, which might have reduced the differences in CSF NfL level distributions between dementia subtypes. Finally, the authors only analyzed studies that relied on a specific immunoassay for CSF NfL level.

The authors reported receiving funding from various pharmaceutical and biopharmaceutical companies, as well as from grants and research foundations. The funders did not influence the study design, data analysis, or interpretation, however.

egreb@mdedge.com

SOURCE: Bridel C et al. JAMA Neurol. 2019 June 17. doi: 10.1001/jamaneurol.2019.1534.

CSF levels of neurofilament light (NfL) are elevated in most neurologic conditions, according to an analysis published online ahead of print June 17 in JAMA Neurology. The biomarker has the potential to distinguish between frontotemporal dementia (FTD) and other dementia subtypes, as well as between Parkinson’s disease and atypical parkinsonian syndromes, said the investigators. It may be necessary to identify age- and sex-specific reference values for NfL, they added.

Neurologists have long understood CSF levels of NfL to be elevated in neurodegenerative conditions, but researchers previously had not compared these levels systematically among neurologic disorders. Similarly, the literature indicates a positive association between CSF NfL level and age in healthy controls, but this association has not been evaluated systematically in neurologic disorders. The resulting lack of clarity has impeded the use of NfL as a diagnostic biomarker.
 

A meta-analysis of CSF samples

Claire Bridel, MD, PhD, of the department of clinical chemistry at the VU University Medical Centre in Amsterdam and colleagues conducted a systematic review and meta-analysis to compare CSF levels of NfL among diagnoses, assess the associations of age and sex with NfL, and evaluate the potential of NfL as a diagnostic biomarker. The investigators searched PubMed for studies published between Jan. 1, 2006, and Jan. 1, 2016, that reported CSF levels of NfL in neurologic or psychiatric conditions or in healthy controls. They included only studies that used the same commercially available immunoassay that has been used in most studies since 2006. The literature indicates that this enzyme-linked immunosorbent assay is sensitive and robust. Dr. Bridel and colleagues contacted study authors and requested their individual-level data.

The investigators sorted the most common neurologic conditions into three groups of similar disorders. The first group included inflammatory conditions of the CNS, such as multiple sclerosis, clinically isolated syndrome (CIS), and optic neuritis. The second group included dementia syndromes (such as Alzheimer’s disease, FTD, vascular dementia, and dementia with Lewy bodies) and amyotrophic lateral sclerosis (ALS). The third category included parkinsonian syndromes such as Parkinson’s disease, Parkinson’s disease dementia, multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and corticobasal syndrome (CBS). The authors used generalized linear mixed-effects models to estimate the fixed effects of age, sex, and diagnosis on log-transformed NfL levels. They modeled cohort of origin as a random intercept.
 

NfL increased with age

Dr. Bridel and colleagues identified 153 relevant investigations, of which 44 met their inclusion criteria. The original investigators provided data sets for these studies, along with three previously unpublished data sets. The data sets included information from 10,059 participants (mean age, 59.7 years; 54.1% female). After excluding diagnostic categories with fewer than five observations per sex, Dr. Bridel and colleagues included data for 10,012 people in the analysis. In this population, the researchers identified 2,795 patients with inflammatory diseases of the CNS, 4,284 patients with dementia or predementia, 984 patients with parkinsonian disorders, and 1,332 healthy controls.

CSF level of NfL was elevated in most neurologic conditions, compared with healthy controls. The largest effect sizes were in cognitively impaired patients with HIV (21.36), patients with FTD/ALS (10.48), patients with ALS (7.58), and patients with Huntington’s disease (5.88).

In healthy controls, the level of NfL in CSF increased by 3.30% annually. The investigators also observed an association between age and CSF NfL level in people with subjective complaints, bipolar disorder, and most neurodegenerative conditions. They found no association, however, in patients with MS, HIV and cognitive impairment, and rapidly progressive neurodegenerative conditions (such as FTD, ALS, FTD/ALS, MSA, PSP, CBS, and Huntington’s disease). CSF level of NfL was 26.0% higher in men among healthy controls. This discrepancy also was observed in a minority of neurologic conditions, including MS, Alzheimer’s disease, vascular dementia, and Parkinson’s disease.

Mean CSF levels of NfL were similar between patients with inflammatory conditions of the CNS. Among dementias and related disorders, mean CNS level of NfL was significantly higher in FTD than in Alzheimer’s disease (2.08), vascular dementia (1.56), and dementia with Lewy bodies (2.50). Among parkinsonian syndromes, the mean CSF levels of NfL were higher in MSA, PSP, and CBS, compared with Parkinson’s disease.
 

Many factors influence NfL level in CSF

The association between CNS level of NfL with age among healthy controls “implies that age-specific reference values may be needed and that the diagnostic potential of CSF NfL may decrease with age,” said the researchers. The finding that CSF NfL level was higher in men in a minority of diagnoses has uncertain clinical significance, they added. Sex-specific reference values may be needed.

Dr. Bridel and colleagues found that age, sex, and cohort explained 46% of variation in CSF level of NfL, which suggests that many factors that determine this level have yet to be identified. Disease duration and disease severity could influence the CSF level of NfL, but the data sets that the investigators analyzed did not include this information.

Because CSF NfL level did not differ significantly between relapsing/remitting MS, secondary progressive MS, and primary progressive MS, this biomarker “may not differentiate acute inflammation-induced neuronal damage in the context of relapses from progressive neurodegeneration if the consequences of recent relapses or novel lesion formation are not considered,” said Dr. Bridel and colleagues. The findings do suggest, however, that CSF level of NfL can distinguish FTD from other dementias, as well as Parkinson’s disease from atypical parkinsonian syndromes. Furthermore, it is possible that the findings of this study can be translated to serum level of NfL, said the authors.

One of the study’s limitations was that diagnosis was based on clinical criteria, said Dr. Bridel and colleagues. In addition, the authors were unable to identify dementia of multifactorial origin, which might have reduced the differences in CSF NfL level distributions between dementia subtypes. Finally, the authors only analyzed studies that relied on a specific immunoassay for CSF NfL level.

The authors reported receiving funding from various pharmaceutical and biopharmaceutical companies, as well as from grants and research foundations. The funders did not influence the study design, data analysis, or interpretation, however.

egreb@mdedge.com

SOURCE: Bridel C et al. JAMA Neurol. 2019 June 17. doi: 10.1001/jamaneurol.2019.1534.

CSF levels of neurofilament light (NfL) are elevated in most neurologic conditions, according to an analysis published online ahead of print June 17 in JAMA Neurology. The biomarker has the potential to distinguish between frontotemporal dementia (FTD) and other dementia subtypes, as well as between Parkinson’s disease and atypical parkinsonian syndromes, said the investigators. It may be necessary to identify age- and sex-specific reference values for NfL, they added.

Neurologists have long understood CSF levels of NfL to be elevated in neurodegenerative conditions, but researchers previously had not compared these levels systematically among neurologic disorders. Similarly, the literature indicates a positive association between CSF NfL level and age in healthy controls, but this association has not been evaluated systematically in neurologic disorders. The resulting lack of clarity has impeded the use of NfL as a diagnostic biomarker.
 

A meta-analysis of CSF samples

Claire Bridel, MD, PhD, of the department of clinical chemistry at the VU University Medical Centre in Amsterdam and colleagues conducted a systematic review and meta-analysis to compare CSF levels of NfL among diagnoses, assess the associations of age and sex with NfL, and evaluate the potential of NfL as a diagnostic biomarker. The investigators searched PubMed for studies published between Jan. 1, 2006, and Jan. 1, 2016, that reported CSF levels of NfL in neurologic or psychiatric conditions or in healthy controls. They included only studies that used the same commercially available immunoassay that has been used in most studies since 2006. The literature indicates that this enzyme-linked immunosorbent assay is sensitive and robust. Dr. Bridel and colleagues contacted study authors and requested their individual-level data.

The investigators sorted the most common neurologic conditions into three groups of similar disorders. The first group included inflammatory conditions of the CNS, such as multiple sclerosis, clinically isolated syndrome (CIS), and optic neuritis. The second group included dementia syndromes (such as Alzheimer’s disease, FTD, vascular dementia, and dementia with Lewy bodies) and amyotrophic lateral sclerosis (ALS). The third category included parkinsonian syndromes such as Parkinson’s disease, Parkinson’s disease dementia, multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and corticobasal syndrome (CBS). The authors used generalized linear mixed-effects models to estimate the fixed effects of age, sex, and diagnosis on log-transformed NfL levels. They modeled cohort of origin as a random intercept.
 

NfL increased with age

Dr. Bridel and colleagues identified 153 relevant investigations, of which 44 met their inclusion criteria. The original investigators provided data sets for these studies, along with three previously unpublished data sets. The data sets included information from 10,059 participants (mean age, 59.7 years; 54.1% female). After excluding diagnostic categories with fewer than five observations per sex, Dr. Bridel and colleagues included data for 10,012 people in the analysis. In this population, the researchers identified 2,795 patients with inflammatory diseases of the CNS, 4,284 patients with dementia or predementia, 984 patients with parkinsonian disorders, and 1,332 healthy controls.

CSF level of NfL was elevated in most neurologic conditions, compared with healthy controls. The largest effect sizes were in cognitively impaired patients with HIV (21.36), patients with FTD/ALS (10.48), patients with ALS (7.58), and patients with Huntington’s disease (5.88).

In healthy controls, the level of NfL in CSF increased by 3.30% annually. The investigators also observed an association between age and CSF NfL level in people with subjective complaints, bipolar disorder, and most neurodegenerative conditions. They found no association, however, in patients with MS, HIV and cognitive impairment, and rapidly progressive neurodegenerative conditions (such as FTD, ALS, FTD/ALS, MSA, PSP, CBS, and Huntington’s disease). CSF level of NfL was 26.0% higher in men among healthy controls. This discrepancy also was observed in a minority of neurologic conditions, including MS, Alzheimer’s disease, vascular dementia, and Parkinson’s disease.

Mean CSF levels of NfL were similar between patients with inflammatory conditions of the CNS. Among dementias and related disorders, mean CNS level of NfL was significantly higher in FTD than in Alzheimer’s disease (2.08), vascular dementia (1.56), and dementia with Lewy bodies (2.50). Among parkinsonian syndromes, the mean CSF levels of NfL were higher in MSA, PSP, and CBS, compared with Parkinson’s disease.
 

Many factors influence NfL level in CSF

The association between CNS level of NfL with age among healthy controls “implies that age-specific reference values may be needed and that the diagnostic potential of CSF NfL may decrease with age,” said the researchers. The finding that CSF NfL level was higher in men in a minority of diagnoses has uncertain clinical significance, they added. Sex-specific reference values may be needed.

Dr. Bridel and colleagues found that age, sex, and cohort explained 46% of variation in CSF level of NfL, which suggests that many factors that determine this level have yet to be identified. Disease duration and disease severity could influence the CSF level of NfL, but the data sets that the investigators analyzed did not include this information.

Because CSF NfL level did not differ significantly between relapsing/remitting MS, secondary progressive MS, and primary progressive MS, this biomarker “may not differentiate acute inflammation-induced neuronal damage in the context of relapses from progressive neurodegeneration if the consequences of recent relapses or novel lesion formation are not considered,” said Dr. Bridel and colleagues. The findings do suggest, however, that CSF level of NfL can distinguish FTD from other dementias, as well as Parkinson’s disease from atypical parkinsonian syndromes. Furthermore, it is possible that the findings of this study can be translated to serum level of NfL, said the authors.

One of the study’s limitations was that diagnosis was based on clinical criteria, said Dr. Bridel and colleagues. In addition, the authors were unable to identify dementia of multifactorial origin, which might have reduced the differences in CSF NfL level distributions between dementia subtypes. Finally, the authors only analyzed studies that relied on a specific immunoassay for CSF NfL level.

The authors reported receiving funding from various pharmaceutical and biopharmaceutical companies, as well as from grants and research foundations. The funders did not influence the study design, data analysis, or interpretation, however.

egreb@mdedge.com

SOURCE: Bridel C et al. JAMA Neurol. 2019 June 17. doi: 10.1001/jamaneurol.2019.1534.

Among patients with hepatitis C virus, antiviral treatment is associated with a reduced risk of Parkinson’s disease, according to a cohort study published online June 5 in JAMA Neurology. The results provide evidence that hepatitis C virus is a risk factor for Parkinson’s disease.

In the past several years, epidemiologic studies have suggested an association between hepatitis C virus infection and Parkinson’s disease. A study published in 2017, however, found no association between the two. In addition, these investigations did not consider antiviral therapy as a potential modifying factor.

Wey-Yil Lin, MD, a neurologist at Landseed International Hospital in Taoyuan, Taiwan, and colleagues examined claims data from the Taiwan National Health Insurance Research Database to identify the risk of incident Parkinson’s disease in patients with hepatitis C virus infection who received antiviral treatment, compared with those who did not receive treatment.

The investigators selected all patients with a new diagnosis of hepatitis C virus infection with or without hepatitis from January 1, 2003, to December 31, 2013. They excluded patients who were aged 20 years or younger; had Parkinson’s disease, dementia, or stroke; or had had major hepatic diseases on the index date. To ensure that treated patients had had an effective course of therapy, the researchers excluded patients who were lost to follow-up within 6 months of the index date, received antiviral therapy for fewer than 16 weeks, or developed Parkinson’s disease within 6 months of the index date.

The primary outcome was incident Parkinson’s disease. Dr. Lin and colleagues excluded participants with a diagnosis of stroke and dementia before the index date to reduce the possibility of enrolling participants with secondary and atypical parkinsonism.

To minimize the potential selection bias to which observational studies are subject, the investigators performed propensity score matching with sex, age, comorbidities, and medication as covariates. This method was intended to create treated and untreated cohorts with comparable characteristics.

Dr. Lin and colleagues included 188,152 patients in their analysis. After matching, each group included 39,936 participants. In the group that received antiviral treatment, 45.0% of participants were female, and mean age was 52.8 years. In the untreated group, 44.4% of participants were female, and mean age was 52.5 years.

The incidence density of Parkinson’s disease per 1,000 person-years was 1.00 in the treated group and 1.39 in the untreated group. The difference in risk of Parkinson’s disease between the treated and untreated groups was statistically significant at year 5 of follow-up (hazard ratio [HR], 0.75) and at the end of the cohort (HR, 0.71). The risk did not differ significantly at year 1 and year 3, however. A subgroup analysis found a greater benefit of antiviral therapy among patients who concurrently used dihydropyridine calcium channel blockers.

“To our knowledge, this is the first cohort study to investigate the association between antiviral therapy and risk of Parkinson’s disease in patients with chronic hepatitis C viral infection,” said Dr. Lin and colleagues. Although it is possible that interferon-based antiviral therapy directly protected against the development of Parkinson’s disease, the short time of exposure to the antiviral agent “makes protecting against Parkinson’s disease development in 5 years less likely,” they added.

Among the study limitations that the authors acknowledged was the lack of data about hepatic function profile, serum virologic response, viral genotype, and hepatitis C virus RNA-level. The database that the investigators used also lacked data about behavioral factors (e.g., smoking status, coffee consumption, and alcohol consumption) that may have affected the incidence of Parkinson’s disease in the cohort. Investigations with longer follow-up periods will be needed to provide clearer information, they concluded.

The authors reported no conflicts of interest. The study was funded by grants from Chang Gung Medical Research Fund and from Chang Gung Memorial Hospital.

egreb@mdedge.com

SOURCE: Lin W-Y et al. JAMA Neurol. 2019 Jun 5. doi: 10.1001/jamaneurol.2019.1368.

Among patients with hepatitis C virus, antiviral treatment is associated with a reduced risk of Parkinson’s disease, according to a cohort study published online June 5 in JAMA Neurology. The results provide evidence that hepatitis C virus is a risk factor for Parkinson’s disease.

In the past several years, epidemiologic studies have suggested an association between hepatitis C virus infection and Parkinson’s disease. A study published in 2017, however, found no association between the two. In addition, these investigations did not consider antiviral therapy as a potential modifying factor.

Wey-Yil Lin, MD, a neurologist at Landseed International Hospital in Taoyuan, Taiwan, and colleagues examined claims data from the Taiwan National Health Insurance Research Database to identify the risk of incident Parkinson’s disease in patients with hepatitis C virus infection who received antiviral treatment, compared with those who did not receive treatment.

The investigators selected all patients with a new diagnosis of hepatitis C virus infection with or without hepatitis from January 1, 2003, to December 31, 2013. They excluded patients who were aged 20 years or younger; had Parkinson’s disease, dementia, or stroke; or had had major hepatic diseases on the index date. To ensure that treated patients had had an effective course of therapy, the researchers excluded patients who were lost to follow-up within 6 months of the index date, received antiviral therapy for fewer than 16 weeks, or developed Parkinson’s disease within 6 months of the index date.

The primary outcome was incident Parkinson’s disease. Dr. Lin and colleagues excluded participants with a diagnosis of stroke and dementia before the index date to reduce the possibility of enrolling participants with secondary and atypical parkinsonism.

To minimize the potential selection bias to which observational studies are subject, the investigators performed propensity score matching with sex, age, comorbidities, and medication as covariates. This method was intended to create treated and untreated cohorts with comparable characteristics.

Dr. Lin and colleagues included 188,152 patients in their analysis. After matching, each group included 39,936 participants. In the group that received antiviral treatment, 45.0% of participants were female, and mean age was 52.8 years. In the untreated group, 44.4% of participants were female, and mean age was 52.5 years.

The incidence density of Parkinson’s disease per 1,000 person-years was 1.00 in the treated group and 1.39 in the untreated group. The difference in risk of Parkinson’s disease between the treated and untreated groups was statistically significant at year 5 of follow-up (hazard ratio [HR], 0.75) and at the end of the cohort (HR, 0.71). The risk did not differ significantly at year 1 and year 3, however. A subgroup analysis found a greater benefit of antiviral therapy among patients who concurrently used dihydropyridine calcium channel blockers.

“To our knowledge, this is the first cohort study to investigate the association between antiviral therapy and risk of Parkinson’s disease in patients with chronic hepatitis C viral infection,” said Dr. Lin and colleagues. Although it is possible that interferon-based antiviral therapy directly protected against the development of Parkinson’s disease, the short time of exposure to the antiviral agent “makes protecting against Parkinson’s disease development in 5 years less likely,” they added.

Among the study limitations that the authors acknowledged was the lack of data about hepatic function profile, serum virologic response, viral genotype, and hepatitis C virus RNA-level. The database that the investigators used also lacked data about behavioral factors (e.g., smoking status, coffee consumption, and alcohol consumption) that may have affected the incidence of Parkinson’s disease in the cohort. Investigations with longer follow-up periods will be needed to provide clearer information, they concluded.

The authors reported no conflicts of interest. The study was funded by grants from Chang Gung Medical Research Fund and from Chang Gung Memorial Hospital.

egreb@mdedge.com

SOURCE: Lin W-Y et al. JAMA Neurol. 2019 Jun 5. doi: 10.1001/jamaneurol.2019.1368.

Among patients with hepatitis C virus, antiviral treatment is associated with a reduced risk of Parkinson’s disease, according to a cohort study published online June 5 in JAMA Neurology. The results provide evidence that hepatitis C virus is a risk factor for Parkinson’s disease.

In the past several years, epidemiologic studies have suggested an association between hepatitis C virus infection and Parkinson’s disease. A study published in 2017, however, found no association between the two. In addition, these investigations did not consider antiviral therapy as a potential modifying factor.

Wey-Yil Lin, MD, a neurologist at Landseed International Hospital in Taoyuan, Taiwan, and colleagues examined claims data from the Taiwan National Health Insurance Research Database to identify the risk of incident Parkinson’s disease in patients with hepatitis C virus infection who received antiviral treatment, compared with those who did not receive treatment.

The investigators selected all patients with a new diagnosis of hepatitis C virus infection with or without hepatitis from January 1, 2003, to December 31, 2013. They excluded patients who were aged 20 years or younger; had Parkinson’s disease, dementia, or stroke; or had had major hepatic diseases on the index date. To ensure that treated patients had had an effective course of therapy, the researchers excluded patients who were lost to follow-up within 6 months of the index date, received antiviral therapy for fewer than 16 weeks, or developed Parkinson’s disease within 6 months of the index date.

The primary outcome was incident Parkinson’s disease. Dr. Lin and colleagues excluded participants with a diagnosis of stroke and dementia before the index date to reduce the possibility of enrolling participants with secondary and atypical parkinsonism.

To minimize the potential selection bias to which observational studies are subject, the investigators performed propensity score matching with sex, age, comorbidities, and medication as covariates. This method was intended to create treated and untreated cohorts with comparable characteristics.

Dr. Lin and colleagues included 188,152 patients in their analysis. After matching, each group included 39,936 participants. In the group that received antiviral treatment, 45.0% of participants were female, and mean age was 52.8 years. In the untreated group, 44.4% of participants were female, and mean age was 52.5 years.

The incidence density of Parkinson’s disease per 1,000 person-years was 1.00 in the treated group and 1.39 in the untreated group. The difference in risk of Parkinson’s disease between the treated and untreated groups was statistically significant at year 5 of follow-up (hazard ratio [HR], 0.75) and at the end of the cohort (HR, 0.71). The risk did not differ significantly at year 1 and year 3, however. A subgroup analysis found a greater benefit of antiviral therapy among patients who concurrently used dihydropyridine calcium channel blockers.

“To our knowledge, this is the first cohort study to investigate the association between antiviral therapy and risk of Parkinson’s disease in patients with chronic hepatitis C viral infection,” said Dr. Lin and colleagues. Although it is possible that interferon-based antiviral therapy directly protected against the development of Parkinson’s disease, the short time of exposure to the antiviral agent “makes protecting against Parkinson’s disease development in 5 years less likely,” they added.

Among the study limitations that the authors acknowledged was the lack of data about hepatic function profile, serum virologic response, viral genotype, and hepatitis C virus RNA-level. The database that the investigators used also lacked data about behavioral factors (e.g., smoking status, coffee consumption, and alcohol consumption) that may have affected the incidence of Parkinson’s disease in the cohort. Investigations with longer follow-up periods will be needed to provide clearer information, they concluded.

The authors reported no conflicts of interest. The study was funded by grants from Chang Gung Medical Research Fund and from Chang Gung Memorial Hospital.

egreb@mdedge.com

SOURCE: Lin W-Y et al. JAMA Neurol. 2019 Jun 5. doi: 10.1001/jamaneurol.2019.1368.