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Difficulty: MediumBipolar and Related Disorders

A 26-year-old female graduate student is brought to the emergency department by her roommate. For the past month, the patient has exhibited profound sadness, a 4.5-kg (10-lb) weight loss, and severe psychomotor retardation. She sleeps 14 hours a day and refuses to attend her classes. During the interview, she stares blankly and admits she has been hearing a persistent voice saying she is "a fraud who deserves to die." The roommate reports that two years ago, the patient had a distinct 3-week period where she barely slept, spoke incredibly fast, bought thousands of dollars of unneeded laboratory equipment on credit, and claimed she had independently deciphered the human genome. That prior episode culminated in a 5-day psychiatric hospitalization. Her urine toxicology screen is negative. Which of the following is the most accurate diagnosis and most appropriate initial pharmacotherapy for this patient?

  1. Bipolar I disorder; initiate quetiapineAnswer
  2. B
    Major depressive disorder with psychotic features; initiate sertraline
  3. C
    Schizophreniform disorder; initiate paliperidone
  4. D
    Major depressive disorder with psychotic features; initiate citalopram and selegiline
  5. E
    Schizophrenia; initiate haloperidol

Answer

The most accurate diagnosis is Bipolar I disorder, and the most appropriate treatment is to initiate quetiapine.
The correct answer accurately identifies that a single lifetime episode of mania (characterized by grandiosity, decreased sleep, rapid speech, and hospitalization) is sufficient to diagnose Bipolar I disorder, regardless of the current presentation. Because the patient is currently in a severe depressive episode with psychotic features, treatment must target both mood stabilization and psychosis. Quetiapine is a second-generation antipsychotic with robust, FDA-approved efficacy in acute bipolar depression, and it will simultaneously manage her auditory hallucinations without the risk of precipitating a manic switch.

Step-by-Step Solution

1
Analyze the patient's psychiatric history from two years ago.
The history of a 3-week period of elevated mood, grandiosity, decreased need for sleep, and hospitalization indicates a severe manic episode.
Identifying any lifetime history of mania is required to correctly differentiate bipolar I disorder from unipolar major depressive disorder.
2
Evaluate the patient's current clinical presentation.
The patient exhibits depressed mood, significant weight loss, hypersomnia, psychomotor retardation, and auditory hallucinations for 1 month, indicating an acute major depressive episode with mood-congruent psychotic features.
Establishing the current phase of the bipolar illness dictates the immediate pharmacological intervention.
3
Select a safe and effective pharmacotherapy for the current diagnosis.
Quetiapine is selected over antidepressant monotherapy or isolated mood stabilizers.
Antidepressant monotherapy is contraindicated in bipolar disorder due to the risk of inducing a manic switch. An atypical antipsychotic like quetiapine is FDA-approved for bipolar depression and will concurrently address the psychotic features.

Key Concept

Patients presenting with acute depression must be screened for a history of mania or hypomania to rule out Bipolar Disorder. Antidepressant monotherapy is contraindicated in bipolar depression due to the risk of manic switch; first-line treatments include quetiapine, lurasidone, or olanzapine-fluoxetine combination.
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Topics

Bipolar and Related Disorders

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