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Difficulty: MediumBipolar and Related Disorders

A 32-year-old female high school teacher presents to the clinic reporting a 4-week history of severely depressed mood, profound fatigue, and sleeping up to 14 hours a day. She says she can no longer concentrate on grading her students' assignments and feels completely worthless. The patient mentions she had a similar period of depression in her mid-twenties. When asked about periods of unusually elevated mood, she recalls an episode three years ago that lasted for 12 days. During that time, she felt "invincible," slept only 2 hours a night without feeling tired, spoke so rapidly that friends could not understand her, and impulsively spent her life savings on a high-risk investment. Her vital signs are within normal limits. Physical examination is unremarkable. Laboratory tests reveal a thyroid-stimulating hormone (TSH) level of 2.1 µU/mL (normal: 0.4-4.0 µU/mL) and free thyroxine (T4) of 1.2 ng/dL (normal: 0.8-1.8 ng/dL). Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Initiate citalopram therapy
  2. B
    Initiate venlafaxine therapy
  3. Initiate lithium therapyAnswer
  4. D
    Initiate levothyroxine therapy
  5. E
    Initiate fluoxetine and selegiline therapy

Answer

Initiate lithium therapy
The patient is currently experiencing a major depressive episode but has a clear history of a manic episode (elevated mood, decreased need for sleep, rapid speech, and impulsive spending lasting for 12 days). This presentation is diagnostic of bipolar I disorder. The first-line treatment for an acute depressive episode in bipolar disorder includes mood stabilizers, such as lithium or lamotrigine, or certain atypical antipsychotics. Initiating a mood stabilizer appropriately treats the depression while protecting the patient against a manic switch.

Step-by-Step Solution

1
Analyze the patient's current symptoms.
The patient presents with severe sadness, fatigue, feelings of worthlessness, and hypersomnia lasting 4 weeks, indicating a major depressive episode.
To establish the current clinical state requiring treatment.
2
Evaluate the patient's psychiatric history for past mood episodes.
The patient has a history of a 12-day episode characterized by a decreased need for sleep, rapid speech, grandiosity, and impulsive spending.
To differentiate between unipolar major depressive disorder and bipolar disorder.
3
Synthesize the findings to establish a diagnosis.
The history of a full manic episode (lasting at least 7 days with significant impairment) confirms a diagnosis of bipolar I disorder, currently in a depressed episode.
Accurate diagnosis dictates the pharmacological approach and helps avoid dangerous medication errors.
4
Determine the appropriate pharmacotherapy.
A mood stabilizer (e.g., lithium, lamotrigine) or an approved atypical antipsychotic is indicated, whereas antidepressant monotherapy must be avoided.
To effectively treat the depressive episode without precipitating a manic switch.

Key Concept

Diagnosis of bipolar I disorder and the avoidance of antidepressant monotherapy.
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Topics

Bipolar and Related Disorders

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