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Difficulty: Very hardDepressive Disorders

A 26-year-old woman is brought to the clinic by her sister due to a 5-week history of severe depression. The patient describes her mood as "bottomless" and complains that her arms and legs constantly feel "heavy as lead." She reports sleeping 14 to 16 hours daily and has gained 6 kg (13.2 lb) over the past month, which she attributes to intense carbohydrate cravings. Despite her profound sadness, the sister notes that the patient's mood brightened considerably yesterday when she was presented with a surprise gift, though she relapsed into despondency hours later. The patient has experienced two similar depressive episodes in the past. The sister confidentially shares that during the patient's sophomore year of college, there was a distinct 10-day period where she seemed "like a completely different person." During that time, she slept only 3 hours a night without feeling fatigued, rapidly repainted her entire apartment, and abruptly spent her tuition money on a business venture that never materialized. She has no significant past medical history. Physical examination is unremarkable. Which of the following is the most appropriate next step in pharmacotherapy for this patient?

  1. Initiate quetiapineAnswer
  2. B
    Initiate sertraline
  3. C
    Initiate phenelzine
  4. D
    Initiate lamotrigine
  5. E
    Initiate divalproex sodium

Answer

Initiate quetiapine
The correct answer is to initiate quetiapine. This patient is currently experiencing a major depressive episode characterized by atypical features, which include mood reactivity (brightening in response to positive events), hypersomnia, weight gain/hyperphagia, and leaden paralysis (heavy feeling in limbs). Crucially, her history reveals a distinct 10-day period of decreased need for sleep, increased goal-directed activity, and impulsivity. Because this elevated state lasted longer than 4 days and did not result in severe functional impairment or require hospitalization, it meets the criteria for a hypomanic episode. A history of at least one major depressive episode and at least one hypomanic episode establishes the diagnosis of Bipolar II disorder. For the acute treatment of bipolar depression, first-line pharmacotherapy includes specific atypical antipsychotics such as quetiapine, lurasidone, or cariprazine.

Step-by-Step Solution

1
Identify the features of the current depressive episode.
The patient has leaden paralysis, hypersomnia, weight gain, and mood reactivity.
These specifically meet the DSM-5 criteria for a major depressive episode with atypical features.
2
Evaluate the patient's psychiatric history for periods of elevated mood.
The history reveals a 10-day period of decreased need for sleep, increased goal-directed activity, and impulsivity without severe impairment requiring hospitalization.
This establishes a history of a past hypomanic episode, which changes the primary diagnosis from Major Depressive Disorder to Bipolar II disorder.
3
Determine the appropriate pharmacotherapy for acute Bipolar II depression.
First-line agents include quetiapine, lurasidone, or cariprazine. Antidepressant monotherapy must be avoided.
Antidepressants can precipitate a manic or hypomanic switch in patients with bipolar disorder.

Key Concept

Bipolar II Disorder presenting as acute depression with atypical features
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Topics

Depressive Disorders

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