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Difficulty: MediumDepressive Disorders

A 27-year-old primigravida at 16 weeks gestation is brought to the clinic by her partner due to worsening mood. Over the last four weeks, she has felt profoundly sad, lacks energy, and sleeps up to 14 hours a day. She expresses deep guilt and says she feels "empty." Her partner notes that during her second year of college, she experienced a distinct two-week period where she slept only three hours a night, spoke at an unusually rapid pace, and started three different business ventures that rapidly failed. That prior episode resolved without hospitalization. She currently takes a daily prenatal vitamin and an over-the-counter dextromethorphan syrup for a chronic post-viral cough. Vital signs are within normal limits. Recent laboratory testing shows a thyroid-stimulating hormone (TSH) level of 1.1 mU/L. Which of the following is the most appropriate next step in pharmacologic management?

  1. A
    Initiate levothyroxine
  2. B
    Initiate sertraline
  3. Initiate lurasidoneAnswer
  4. D
    Initiate phenelzine
  5. E
    Reassure the patient that these are normal physiologic changes

Answer

The most appropriate next step is to initiate lurasidone.
The correct answer involves initiating an atypical antipsychotic approved for bipolar depression. This patient is presenting with a major depressive episode, but her history of a distinct period with decreased need for sleep, rapid speech, and impulsive goal-directed activity establishes an underlying diagnosis of bipolar disorder. In bipolar depression, traditional antidepressant monotherapy is contraindicated. Lurasidone is a first-line, FDA-approved monotherapy for bipolar depression and possesses a favorable safety profile for use during pregnancy.

Step-by-Step Solution

1
Evaluate the current symptom profile and duration.
The patient exhibits profound sadness, hypersomnia, anergia, and guilt lasting four weeks, which meets the criteria for a major depressive episode.
Establishing the current phase of the psychiatric illness is required to guide immediate management.
2
Analyze the patient's psychiatric history for prior mood episodes.
The history reveals a distinct two-week period of decreased need for sleep, rapid speech, and increased goal-directed activity, indicating a past manic or hypomanic episode.
A history of mania or hypomania changes the diagnosis from unipolar major depressive disorder to bipolar disorder, fundamentally altering the treatment algorithm.
3
Review current medications and pregnancy status to select a safe intervention.
The patient is pregnant and taking dextromethorphan. Lurasidone is selected over antidepressants (to avoid manic switch) and MAOIs (to avoid serotonin syndrome with dextromethorphan).
Lurasidone is an FDA-approved, first-line agent for bipolar depression with registry data supporting its relative safety during pregnancy.

Key Concept

Discriminating bipolar depression from unipolar depression and selecting appropriate pharmacotherapy
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Topics

Depressive Disorders

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