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Difficulty: EasyBipolar and Related Disorders

A 26-year-old man is brought to the outpatient psychiatric clinic by his sister due to severe depressive symptoms for the past 3 weeks. He reports sleeping 14 hours a day, profound fatigue, and an inability to experience pleasure. Two years ago, he had a distinct episode of severe grandiosity, racing thoughts, decreased need for sleep, and auditory hallucinations commanding him to "lead the world." This prior episode lasted for exactly 3 weeks before remitting completely. He was recently prescribed selegiline for his low mood by a different provider, but he stopped taking it 2 days ago because he felt it was not working. His vital signs are within normal limits. Mental status examination reveals psychomotor retardation and a blunted affect, but no current psychosis. Laboratory studies show a TSH of 2.8 µU/mL (normal: 0.4-4.0 µU/mL) and a normal free T4. Which of the following is the most appropriate next step in the pharmacologic management of this patient?

  1. Initiate quetiapine therapyAnswer
  2. B
    Initiate fluoxetine monotherapy
  3. C
    Restart selegiline and initiate citalopram
  4. D
    Initiate levothyroxine therapy
  5. E
    Initiate long-acting injectable haloperidol

Answer

The most appropriate next step is to initiate quetiapine therapy.
The correct answer identifies that the patient is experiencing an acute depressive episode in the context of Bipolar I disorder (diagnosed by his past 3-week episode of mania with psychotic features). Quetiapine is a first-line, FDA-approved treatment for acute bipolar depression. It safely targets depressive symptoms without the high risk of precipitating a manic switch associated with traditional antidepressants.

Step-by-Step Solution

1
Diagnose the patient's underlying psychiatric condition based on his history.
The patient has Bipolar I disorder.
The patient presents with a major depressive episode but has a history of a distinct 3-week episode of grandiosity, decreased need for sleep, and psychosis, which meets the criteria for a manic episode.
2
Determine the appropriate treatment for an acute depressive episode in Bipolar I disorder.
Select a medication approved for bipolar depression, such as quetiapine, lurasidone, or olanzapine-fluoxetine combination.
Standard antidepressants (like SSRIs) as monotherapy are contraindicated due to the risk of precipitating mania.
3
Evaluate the patient's recent medication history to avoid drug interactions.
The patient discontinued selegiline (an MAOI) only 2 days ago.
A minimum 14-day washout period is required before starting any serotonergic agents to prevent serotonin syndrome, ruling out immediate SSRI use even as an adjunct.

Key Concept

Management of acute bipolar depression
Estimated Time:1m 0s
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Topics

Bipolar and Related Disorders

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