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Difficulty: MediumBipolar and Related Disorders

A 29-year-old woman is brought to the psychiatrist by her sister due to worsening isolation and profound sadness over the past 55 weeks. The patient sleeps 1414 hours daily and frequently hears voices stating, "You are a vessel of sin." Three years ago, she experienced a 1010-day period during which she slept only 33 hours per night, spoke incessantly, and aggressively attempted to start a new company despite having no related experience. She has a history of primary hypothyroidism, for which she takes daily levothyroxine. Vital signs are normal. Laboratory results demonstrate a TSH of 2.22.2 μ\mu U/mL (normal: 0.40.4-4.04.0 μ\mu U/mL) and a free T4 of 1.31.3 ng/dL (normal: 0.90.9-1.71.7 ng/dL). Which of the following is the most appropriate next step in the management of this patient?

  1. Initiate quetiapineAnswer
  2. B
    Initiate escitalopram
  3. C
    Initiate citalopram and phenelzine
  4. D
    Increase the levothyroxine dosage
  5. E
    Initiate haloperidol

Answer

Initiate quetiapine
The correct intervention is to initiate quetiapine. This patient's current presentation of profound sadness, hypersomnia, and mood-congruent auditory hallucinations represents a major depressive episode with psychotic features. Her psychiatric history of a 10-day episode characterized by decreased need for sleep, pressured speech, and grandiose behaviors definitively establishes a diagnosis of Bipolar I disorder. The standard of care for acute bipolar depression includes specific second-generation antipsychotics like quetiapine or lurasidone, which provide robust antidepressant effects while inherently protecting against treatment-emergent mania. In this case, quetiapine is particularly advantageous as it will simultaneously treat her psychotic symptoms.

Step-by-Step Solution

1
Evaluate the current clinical presentation and duration of symptoms.
The patient is experiencing a major depressive episode with mood-congruent psychotic features (auditory hallucinations), lasting for 5 weeks.
To accurately characterize the current phase of her psychiatric illness.
2
Analyze the patient's psychiatric history.
The patient has a clear history of a prior manic episode (10 days of decreased sleep, pressured speech, grandiosity).
A history of true mania shifts the diagnosis from Major Depressive Disorder or a primary psychotic disorder to Bipolar I Disorder.
3
Assess the medical history and laboratory findings.
Her TSH and free T4 are entirely within normal limits.
To rule out a medical etiology (e.g., undertreated hypothyroidism) as the cause of her current severe depressive symptoms.
4
Determine the most appropriate pharmacotherapy for the established diagnosis.
Quetiapine should be initiated.
Quetiapine is a second-generation antipsychotic that is uniquely approved for the treatment of acute bipolar depression, and it will concurrently address her psychotic symptoms. Crucially, it avoids the risk of a manic switch associated with antidepressant monotherapy.

Key Concept

Bipolar I depression with psychotic features requires treatment with an agent that addresses both depression and psychosis safely, such as quetiapine, while strictly avoiding antidepressant monotherapy.
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Topics

Bipolar and Related Disorders

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