A 28-year-old woman, 3 months postpartum, is brought to the clinic by her husband for a ps… — USMLE Step 2 CK

A 28-year-old woman, 3 months postpartum, is brought to the clinic by her husband for a psychiatric evaluation. She has been exclusively formula-feeding her infant. For the past 4 weeks, she has experienced profound sadness, frequent crying spells, excessive sleepiness, and an inability to care for her baby. She states, "I am a terrible mother and my baby deserves better." Three weeks ago, her obstetrician prescribed sertraline, but she discontinued it after 5 days because she "felt it wasn't working fast enough." Her husband notes that 4 years ago, she had a 2-week period where she slept only 2 hours a night, spoke rapidly, and claimed she was chosen by God to lead a new religion; this episode required a brief psychiatric hospitalization. Her temperature is $37.0^\circ\text{C}$ ( $98.6^\circ\text{F}$ ), blood pressure is $110/70 \text{ mm Hg}$ , and pulse is $78/\text{min}$ . Physical examination is unremarkable. Laboratory studies show a thyroid-stimulating hormone (TSH) level of $1.5 \ \mu\text{U/mL}$ (normal: $0.5-5.0$ ). She is currently taking no medications. Which of the following is the most appropriate next step in management?

A
Prescribe phenelzine and restart sertraline simultaneously
B
Diagnose schizophreniform disorder and initiate risperidone
C
Initiate sertraline monotherapy and advise continuation for 4 weeks after symptom remission
Initiate lurasidone therapyAnswer
E
Initiate levothyroxine therapy

Answer

Initiate lurasidone therapy

The patient is currently experiencing a major depressive episode, but her clear history of a 2-week manic episode with psychotic features (delusions of being chosen by God) requiring hospitalization establishes a definitive diagnosis of Bipolar I disorder. Therefore, her current presentation is bipolar depression. First-line pharmacologic treatment for acute bipolar depression includes specific atypical antipsychotics such as lurasidone, quetiapine, or cariprazine. These medications effectively target depressive symptoms in bipolar disorder without the high risk of precipitating a manic episode.

Step-by-Step Solution

Evaluate the current clinical presentation and psychiatric history.

The patient meets criteria for a major depressive episode, but her history of a 2-week period with decreased need for sleep, rapid speech, grandiosity, and psychotic features confirms an underlying diagnosis of Bipolar I disorder.

Establishing the correct diagnosis (Bipolar I disorder, current episode depressed) is essential to distinguish it from unipolar major depressive disorder before selecting pharmacotherapy.

Analyze prior medication trials and assess risks.

The patient previously received sertraline (an SSRI), which she prematurely discontinued. Restarting an SSRI as monotherapy is contraindicated in bipolar disorder due to the high risk of iatrogenic manic switching.

Recognizing the danger of antidepressant monotherapy in bipolar patients prevents severe adverse outcomes like acute mania.

Select the most appropriate pharmacotherapy for bipolar depression.

Lurasidone is selected.

Atypical antipsychotics (such as lurasidone, quetiapine, or cariprazine) are FDA-approved first-line treatments for acute bipolar depression.

Key Concept

Patients presenting with a major depressive episode must be carefully screened for a history of mania or hypomania; if a bipolar disorder diagnosis is established, antidepressant monotherapy should be avoided and first-line bipolar depression agents (e.g., lurasidone, quetiapine) should be initiated.

Estimated Time:1m 30s

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