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Question

Difficulty: MediumDepressive Disorders

A 31-year-old woman is evaluated in the clinic for severe mood changes. She delivered her first child 5 months ago without complications. Over the past 8 weeks, she has experienced profound sadness, anhedonia, and a 5-kg (11-lb) weight loss. She awakens at 3:00 AM daily and cannot return to sleep. She notes her depressed mood is worst in the mornings and is completely unreactive to positive events, including playing with her infant. Two weeks ago, her primary care physician prescribed escitalopram; however, she discontinued it 4 days ago, stating it was ineffective. Her husband reports that five years ago, she had a 7-day episode where she slept only 2 hours per night, spoke incessantly, and compulsively purchased thousands of dollars of baby clothes despite not being pregnant. She has no other medical conditions and does not use illicit substances. Vital signs and physical examination are unremarkable. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Advise the patient that therapeutic response takes 4 to 6 weeks and instruct her to resume escitalopram
  2. Begin treatment with quetiapineAnswer
  3. C
    Reassure the patient that her symptoms represent a normal postpartum transition and recommend a support group
  4. D
    Initiate phenelzine and provide tyramine-restricted dietary counseling
  5. E
    Switch pharmacotherapy to bupropion

Answer

Begin treatment with quetiapine
The correct action is to begin treatment with quetiapine. This patient presents with a major depressive episode featuring melancholic characteristics. However, her history of a 7-day period of decreased sleep, pressured speech, and severe impulsivity establishes a diagnosis of Bipolar I disorder. The standard of care for bipolar depression includes atypical antipsychotics such as quetiapine or lurasidone, or mood stabilizers like lithium, to treat the depression without risking a manic switch.

Step-by-Step Solution

1
Identify the current clinical syndrome from the patient's presentation.
The patient is currently experiencing a major depressive episode with melancholic features, characterized by anhedonia, early morning awakenings, unreactive mood, and significant weight loss occurring in the postpartum period.
Establishing the current episode dictates the immediate need for psychiatric intervention.
2
Evaluate the patient's psychiatric history for previous mood episodes.
The husband describes a distinct past episode of decreased need for sleep, pressured speech, and severe impulsivity lasting 7 days, which meets the criteria for a manic episode.
A history of mania completely changes the diagnostic framework from unipolar depression to bipolar disorder.
3
Formulate the correct diagnosis and select the appropriate pharmacotherapy.
The diagnosis is Bipolar I disorder, currently in a depressed episode. The most appropriate treatment is an atypical antipsychotic approved for bipolar depression, such as quetiapine or lurasidone.
Antidepressant monotherapy is contraindicated in bipolar disorder due to the high risk of inducing a manic switch.

Key Concept

Patients presenting with a major depressive episode must be screened for a history of mania or hypomania; if present, the diagnosis is bipolar disorder, and treatment requires a mood stabilizer or approved atypical antipsychotic rather than antidepressant monotherapy.
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Topics

Depressive Disorders

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