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Difficulty: MediumBipolar and Related Disorders

A 25-year-old male fitness instructor presents to a primary care clinic reporting a 6-week history of feeling 'completely drained of energy.' He states that he has lost interest in his usual workout routines, struggles to concentrate on his business, and has been sleeping up to 13 hours a day. His medical history is unremarkable, and he currently takes no medications. Upon further questioning about his past psychiatric history, he recalls a 5-week period approximately two years ago when he felt 'invincible.' During that time, he slept only 3 hours per night, spoke incredibly fast, and spontaneously purchased extremely expensive gym equipment that led to bankruptcy. He also harbored an intense belief that he possessed a telepathic ability to communicate with elite athletes worldwide; this belief entirely resolved when his energy levels returned to baseline. His vital signs are within normal limits. Mental status examination today reveals a blunted affect and psychomotor retardation, with no current delusional thought processes or suicidal ideation. Which of the following is the most appropriate next step in pharmacologic management?

  1. A
    Initiate citalopram monotherapy
  2. B
    Initiate fluoxetine and phenelzine combination therapy
  3. Initiate lamotrigineAnswer
  4. D
    Diagnose brief psychotic disorder and initiate haloperidol
  5. E
    Contact the patient's next-of-kin to obtain surrogate consent for involuntary hospitalization

Answer

Initiate lamotrigine
This patient meets the diagnostic criteria for Bipolar I Disorder based on his distinct history of a manic episode (elevated mood, decreased need for sleep, rapid speech, reckless financial behavior, and psychotic features lasting more than 1 week). He is currently presenting with a major depressive episode. The most appropriate pharmacologic management for acute bipolar depression involves initiating a medication with proven efficacy for this phase that carries a low risk of precipitating a manic switch. Lamotrigine is a mood stabilizer that is highly effective for bipolar depression and is commonly used as a first-line agent. Other appropriate first-line options include lithium, cariprazine, or a combination of olanzapine and fluoxetine.

Step-by-Step Solution

1
Identify the patient's current clinical state based on the presenting symptoms.
The patient exhibits depressed mood, anhedonia, hypersomnia, and psychomotor retardation lasting 6 weeks, indicating a major depressive episode.
Establishing the current pole of the mood disorder is essential for selecting the correct acute treatment phase.
2
Analyze the past psychiatric history to determine the overarching diagnosis.
The history of a 5-week episode characterized by decreased need for sleep, rapid speech, reckless spending, and grandiose delusions (telepathy) confirms a prior manic episode with psychotic features.
A single manic episode in a patient's lifetime definitively establishes a diagnosis of Bipolar I Disorder, regardless of current symptoms.
3
Select the most appropriate pharmacologic intervention for bipolar depression.
First-line therapies for bipolar depression include mood stabilizers like lamotrigine, lithium, or specific atypical antipsychotics. Antidepressant monotherapy must be avoided.
Treating bipolar depression requires medications that lift the depressed mood without inducing a switch into mania.

Key Concept

Diagnosis and management of Bipolar I Disorder, current episode depressed, prioritizing mood-stabilizing agents to avoid antidepressant-induced manic switching.

Alternative Method

Lithium, cariprazine, or lurasidone could also be selected as appropriate first-line monotherapies for acute bipolar depression in this patient.
Estimated Time:1m 30s
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Topics

Bipolar and Related Disorders

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