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Difficulty: HardDepressive Disorders

A 28-year-old woman comes to the outpatient clinic for a follow-up appointment. Three weeks ago, she presented with a 2-month history of pervasive sadness, sleeping 14 hours a day, a significantly increased appetite, and a sensation that her arms and legs were "weighed down by lead." She was diagnosed with major depressive disorder and prescribed sertraline. Today, she reports no improvement in her mood or energy. She states, "I have been taking these pills for three weeks and feel exactly the same; I want to just stop taking them."

Upon further questioning, the patient describes an episode three years ago that lasted for two weeks. During that time, she felt "invincible," slept only 2 hours a night without feeling fatigued, spoke so rapidly that friends could not follow her thoughts, and impulsively bought a luxury car she could not afford, which subsequently led to bankruptcy. She has never been hospitalized for psychiatric reasons. Vital signs and physical examination are normal.

Which of the following is the most appropriate next step in management?

  1. Discontinue sertraline and initiate quetiapineAnswer
  2. B
    Continue sertraline at the current dose and reassess in 3 weeks
  3. C
    Increase the dose of sertraline
  4. D
    Cross-taper sertraline to venlafaxine
  5. E
    Discontinue sertraline and initiate bupropion

Answer

The correct management is to discontinue sertraline and initiate quetiapine.
The correct answer is to discontinue the offending SSRI and initiate an appropriate treatment for bipolar depression. This patient presents with a depressive episode featuring atypical symptoms. However, her history of a two-week period characterized by grandiosity, decreased sleep, rapid speech, and severe financial impairment perfectly describes a manic episode. This establishes a diagnosis of Bipolar I Disorder. The use of antidepressant monotherapy (such as sertraline) is contraindicated in bipolar disorder due to the high risk of precipitating a manic switch. The best next step is to discontinue the sertraline and start a first-line agent for acute bipolar depression, such as the atypical antipsychotic quetiapine, or lurasidone.

Step-by-Step Solution

1
Analyze the patient's current symptoms and psychiatric history.
The patient is currently experiencing a depressive episode with atypical features (hypersomnia, hyperphagia, leaden paralysis). However, she has a history of a 2-week episode of grandiosity, decreased need for sleep, pressured speech, and severe impairment (bankruptcy).
Identifying past manic episodes is essential to distinguish Major Depressive Disorder from Bipolar I Disorder.
2
Determine the correct psychiatric diagnosis.
The history of a full manic episode changes the diagnosis from Major Depressive Disorder to Bipolar I Disorder, most recent episode depressed.
A single manic episode is sufficient to establish a diagnosis of Bipolar I Disorder, regardless of current symptoms.
3
Evaluate the current treatment regimen and determine the best next step.
The patient is currently taking sertraline, an SSRI, as monotherapy. This is contraindicated in bipolar disorder and must be stopped. A medication approved for acute bipolar depression, such as quetiapine, should be initiated.
Antidepressant monotherapy in bipolar disorder risks precipitating a manic switch. Quetiapine is a first-line treatment for acute bipolar depression.

Key Concept

Antidepressant monotherapy is contraindicated in patients with Bipolar Disorder due to the risk of inducing a manic switch. Patients presenting with a depressive episode must be thoroughly screened for a history of mania or hypomania before initiating antidepressants.
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Topics

Depressive Disorders

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