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Difficulty: MediumDepressive Disorders

An 18-year-old female university freshman is evaluated at the student health center. Her roommate insisted she be seen because, over the last five weeks, the patient has been skipping classes, crying uncontrollably, and sleeping excessively. The patient reports severe anhedonia, a significant increase in appetite resulting in a 5-kg (11-lb) weight gain, and a sensation of profound physical heaviness in her limbs. Review of her medical records reveals a psychiatric hospitalization eight months ago. During that admission, which lasted 14 days, she exhibited pressured speech, severe psychomotor agitation, an almost complete lack of sleep, and auditory hallucinations commanding her to lead a new global government. She was stabilized and discharged, but subsequently stopped attending follow-up appointments. Three weeks ago, she visited an urgent care clinic for her current depressive symptoms and was started on daily citalopram. She has taken the medication faithfully but reports no improvement in her mood. Vital signs and physical examination are within normal limits. She denies any illicit substance use. Which of the following is the most appropriate pharmacological recommendation at this time?

  1. Withdraw citalopram and initiate quetiapineAnswer
  2. B
    Escalate the current citalopram dosage
  3. C
    Supplement the current regimen with phenelzine
  4. D
    Commence long-term paliperidone for schizophrenia
  5. E
    Substitute citalopram with escitalopram

Answer

The most appropriate next step is to withdraw citalopram and initiate a medication approved for bipolar depression, such as quetiapine.
The correct answer involves withdrawing citalopram and initiating quetiapine. The patient's current presentation is a major depressive episode with atypical features. However, her psychiatric history reveals a clear manic episode with psychotic features (14 days of pressured speech, minimal sleep, agitation, and auditory hallucinations). This presentation establishes a diagnosis of bipolar I disorder, currently in a depressed phase. Antidepressant monotherapy (such as citalopram) is contraindicated in bipolar disorder because it lacks efficacy for bipolar depression and carries a high risk of precipitating a manic switch. The SSRI should be discontinued, and a medication approved for acute bipolar depression—such as quetiapine, lurasidone, or a combination of olanzapine and fluoxetine—should be started.

Step-by-Step Solution

1
Identify the current clinical syndrome.
The patient is experiencing a major depressive episode with atypical features (hypersomnia, hyperphagia, leaden paralysis).
Establishing the current phase of the mood disturbance guides immediate symptom management.
2
Analyze the patient's psychiatric history for prior mood episodes.
The previous 14-day episode of decreased sleep, pressured speech, and psychosis represents a manic episode with psychotic features.
A past manic episode fundamentally changes the primary diagnosis from unipolar major depressive disorder to bipolar I disorder.
3
Determine the appropriate psychopharmacological intervention based on the correct diagnosis.
Citalopram (an SSRI) must be stopped to avoid precipitating mania. A first-line agent for acute bipolar depression, such as quetiapine, should be initiated.
Antidepressant monotherapy is contraindicated in bipolar I disorder due to the high risk of a manic switch.

Key Concept

Patients presenting with depressive episodes must be screened for past manic/hypomanic episodes to differentiate major depressive disorder from bipolar disorder. Antidepressant monotherapy is contraindicated in bipolar depression due to the risk of inducing a manic switch.
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Topics

Depressive Disorders

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