Symptoms of psychosis and OCD in a patient with postpartum depression

CASE Thoughts of harming baby

Ms. A, age 37, is G4P2, 4 months postpartum, and breastfeeding. She has major depressive disorder (MDD) with peripartum onset, posttraumatic stress disorder, and mild intellectual disability. For years she has been stable on fluoxetine 40 mg/d and prazosin 2 mg/d. Despite recent titration of her medications, at her most recent outpatient appointment Ms. A reports having a depressed mood with frequent crying, insomnia, a lack of desire to bond with her baby, and feelings of shame. She also says she has had auditory hallucinations and thoughts of harming her baby. Ms. A’s outpatient physician makes an urgent request for her to be evaluated at the psychiatric emergency department (ED).

HISTORY Depression and possible auditory hallucinations

Ms. A developed MDD following the birth of her first child, for which her care team initiated fluoxetine at 20 mg/d and titrated it to 40 mg/d,which was effective. At that time, her outpatient physician documented potential psychotic features, including vague descriptions of derogatory auditory hallucinations. However, it was unclear if these auditory hallucinations were more representative of a distressing inner monologue without the quality of an external voice. The team determined that Ms. A was not at acute risk for harm to herself or her baby and was appropriate for outpatient care. Because the nature of these possible auditory hallucinations was mild, nondistressing, and nonthreatening, the treatment team did not initiate an antipsychotic and Ms. A was not hospitalized. She has no history of hypomanic/manic episodes and has never met criteria for a psychotic disorder.

EVALUATION Distressing thoughts and discontinued medications

During the evaluation by psychiatric emergency services, Ms. A reports that 2 weeks after giving birth she experienced a worsening of her depressive symptoms. She says she began hearing voices telling her to harm herself and her baby and describes frequent distressing thoughts, such as stabbing her baby with a knife and running over her baby with a car. Ms. A says she repeatedly wakes up at night to check on her baby’s breathing, overfeeds her baby due to a fear of inadequate nutrition, and notes intermittent feelings of confusion. Afraid of being alone with her infant, Ms. A asks her partner and mother to move in with her. Additionally, she says 2 weeks ago she discontinued all her medications at the suggestion of her partner, who recommended herbal supplements. Ms. A’s initial routine laboratory results are unremarkable and her urine drug screen is negative for all substances.

The authors’ observations

Approximately 85% of birthing parents experience some form of postpartum mood disturbance; 10% to 15% develop more significant symptoms of anxiety or depression.³ The etiology of postpartum illness is multifactorial, and includes psychiatric personal/family history, insomnia, acute and chronic psychosocial stressors, and rapid hormone fluctuations.¹ As a result, the postpartum period represents a vulnerable time for birthing parents, particularly those with previously established psychiatric illness.

Ms. A’s initial presentation was concerning for a possible diagnosis of postpartum psychosis vs obsessive-compulsive disorder (OCD) with postpartum onset; other differential diagnoses included MDD with peripartum onset and psychotic features (Table^1-6). Ms. A’s subjective clinical history was significant for critical pertinent findings of both OCD with postpartum onset (ie, egodystonic intrusive thoughts, checking behaviors, feelings of shame, and seeking reassurance) and postpartum psychosis (ie, command auditory hallucinations and waxing/waning confusion), which added to diagnostic complexity.

Although postpartum psychosis is rare (1 to 2 cases per 1,000 women),⁵ it is considered a psychiatric emergency because it has significant potential for infanticide, morbidity, and mortality. Most symptoms develop within the first 2 weeks of the postpartum period.² There are many risk factors for the development of postpartum psychosis; however, in first-time pregnancies, a previous diagnosis of BD I is the single most important risk factor.¹ Approximately 20% to 30% of women with BD experience postpartum psychosis.⁴

For many patients (approximately 56.7%, according to 1 meta-analysis⁷), postpartum psychosis denotes an episode of BD, representing a more severe form of illness with increased risk of recurrence. Most manic or mixed mood episodes reoccur within the first year removed from the perinatal period. In contrast, for some patients (approximately 43.5% according to the same meta-analysis), the episode denotes “isolated postpartum psychosis.”⁷ Isolated postpartum psychosis is a psychotic episode that occurs only in the postpartum period with no recurrence of psychosis or recurrence of psychosis exclusive to postpartum periods. If treated, this type of postpartum psychosis has a more favorable prognosis than postpartum psychosis in a patient with BD.⁷ As such, a BD diagnosis should not be established at the onset of a patient’s first postpartum psychosis presentation. Regardless of type, all presentations of postpartum psychosis are considered a psychiatry emergency.

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