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Difficulty: MediumBipolar and Related Disorders

A 45-year-old male executive presents to the primary care clinic reporting a two-month history of having "zero energy." He describes experiencing a persistently low mood, an inability to enjoy his usual hobbies, and a sensation that his arms and legs are unusually heavy. The patient reports sleeping 12 to 14 hours a day and has gained 7 kg (15.4 lb) over this period. Medical history is notable for migraine headaches, for which he takes sumatriptan as needed; he has used it twice in the past week. Four years ago, the patient experienced a distinct six-day period during which he slept only two hours a night but felt completely rested. During that time, he was highly talkative, unusually confident, and impulsively invested a large amount of money into a risky startup. This caused significant marital friction but did not require hospitalization. Vital signs are within normal limits. Mental status examination reveals psychomotor retardation and a blunted affect, but no delusions or suicidal ideation. Laboratory studies show a thyroid-stimulating hormone (TSH) level of 1.8 µU/mL (normal: 0.5–5.0 µU/mL) and free T4 of 1.1 ng/dL (normal: 0.8–1.8 ng/dL). Which of the following is the most appropriate next step in pharmacotherapy for this patient?

  1. A
    Initiate sertraline
  2. B
    Initiate phenelzine
  3. C
    Initiate levothyroxine
  4. Initiate quetiapineAnswer
  5. E
    Initiate venlafaxine

Answer

Initiate quetiapine
The patient is currently experiencing a major depressive episode (depressed mood, anhedonia, hypersomnia, weight gain) and has a clear history of a hypomanic episode (6 days of elevated mood, decreased need for sleep, increased productivity, and impulsivity without requiring hospitalization). This establishes a diagnosis of bipolar II disorder, currently in a depressive phase. The first-line pharmacological treatment for acute bipolar depression includes specific second-generation antipsychotics, such as quetiapine or lurasidone. Quetiapine has well-established efficacy for this indication and does not carry the risk of precipitating a mood switch.

Step-by-Step Solution

1
Analyze the patient's current presenting symptoms.
The patient has a 2-month history of depressed mood, anhedonia, hypersomnia, weight gain, and leaden paralysis, which meets the criteria for a major depressive episode with atypical features.
Establishing the current phase of the illness is necessary to guide acute management.
2
Evaluate the past psychiatric history for episodes of elevated mood.
The patient had a prior 6-day episode of elevated mood, decreased need for sleep, rapid speech, and impulsivity without requiring hospitalization, meeting the criteria for a hypomanic episode.
A history of hypomania changes the diagnosis from major depressive disorder to bipolar II disorder.
3
Select the appropriate pharmacotherapy for bipolar depression.
Quetiapine is selected as it is a first-line agent for acute bipolar depression.
Antidepressant monotherapy must be avoided in bipolar disorders due to the risk of mood switch, making medications like quetiapine, lurasidone, or cariprazine the preferred options.

Key Concept

Patients presenting with a major depressive episode must be screened for past manic or hypomanic episodes; if present, the diagnosis is bipolar disorder, and treatment involves mood stabilizers or specific second-generation antipsychotics rather than antidepressant monotherapy.
Estimated Time:1m 15s
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Topics

Bipolar and Related Disorders

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