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Question

Difficulty: MediumDepressive Disorders

A 37-year-old man is brought to the clinic by his sister due to a 6-week history of profound fatigue, hypersomnia, and a 4-kg (9-lb) weight gain. He states he feels completely devoid of energy, struggles to get out of bed, and expresses unwarranted guilt over taking time off from his job as an accountant. His sister notes that three years ago, the patient experienced a highly unusual two-week period during which he slept only three hours a night, exhibited pressured speech, and impulsively emptied his savings account to invest in unproven cryptocurrency. He has no other medical history and takes no medications. Vital signs are within normal limits. Laboratory evaluation shows a thyroid-stimulating hormone (TSH) level of 2.1 µU/mL (normal: 0.5-5.0 µU/mL) and a normal free T4 level. Which of the following is the most appropriate initial pharmacotherapy for this patient?

  1. QuetiapineAnswer
  2. B
    Escitalopram
  3. C
    Fluoxetine and phenelzine
  4. D
    Haloperidol
  5. E
    Levothyroxine

Answer

The most appropriate initial pharmacotherapy is quetiapine, as the patient is experiencing a bipolar depressive episode.
The correct answer is quetiapine. This patient is currently experiencing a major depressive episode, but his history of a distinct 2-week period of elevated energy, decreased need for sleep, pressured speech, and severe impulsivity indicates a past manic episode. Therefore, his correct diagnosis is Bipolar I disorder, currently in a depressed phase. First-line treatments for bipolar depression include quetiapine, lurasidone, and the olanzapine-fluoxetine combination. These agents effectively target depressive symptoms without significantly increasing the risk of a manic switch.

Step-by-Step Solution

1
Evaluate the current symptom profile.
The patient has a 6-week history of fatigue, hypersomnia, weight gain, guilt, and low energy, which meets the criteria for a major depressive episode with atypical features.
Establishing the current affective state is the first step in psychiatric diagnosis.
2
Analyze the collateral history provided by the sister.
The patient had a distinct 2-week period of decreased need for sleep, pressured speech, and severe impulsivity (emptying his savings).
All patients presenting with depression must be screened for past manic or hypomanic episodes to differentiate unipolar from bipolar depression.
3
Synthesize the timeline and severity to establish the primary diagnosis.
A history of at least one manic episode (lasting ≥1 week with marked impairment) establishes the diagnosis of Bipolar I disorder. The current presentation is a bipolar depressive episode.
Bipolar I disorder requires at least one manic episode; depressive episodes are common but not required for the diagnosis, though they often dominate the clinical course.
4
Select the appropriate pharmacotherapy.
First-line treatments for bipolar depression include quetiapine, lurasidone, or the olanzapine-fluoxetine combination.
These agents effectively target depressive symptoms without significantly increasing the risk of a manic switch, unlike SSRI monotherapy.

Key Concept

Patients presenting with a major depressive episode must be screened for a history of mania or hypomania to distinguish Bipolar Disorder from Major Depressive Disorder, as treatment pathways differ significantly.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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