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Question

Difficulty: HardDepressive Disorders

A 32-year-old woman is brought to the emergency department by her sister due to a 3-week history of worsening social withdrawal, profound sadness, and extreme fatigue. The patient sleeps up to 15 hours a day and frequently states, "Everyone would be better off without me." Her sister notes the patient recently stopped attending her job as an accountant.

Review of her medical history reveals a depressive episode three years ago, for which her primary care physician prescribed fluoxetine. Three weeks into that treatment, the patient abruptly quit a previous job, flew to another continent alone, and spent her entire life savings over the course of seven days while sleeping less than two hours per night. She was hospitalized abroad, the fluoxetine was discontinued, and her mood gradually stabilized over the next month.

The patient currently takes no medications and uses no illicit substances. Vital signs are within normal limits. Physical examination reveals a flat affect and psychomotor retardation.

Laboratory results are as follows:
TestResultReference Range
Thyroid-stimulating hormone (TSH)4.2 mU/L0.5 - 5.0 mU/L
Free thyroxine (T4)1.1 ng/dL0.9 - 1.7 ng/dL

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

  1. Initiate quetiapine therapyAnswer
  2. B
    Initiate fluoxetine therapy and emphasize avoiding premature drug discontinuation
  3. C
    Initiate bupropion therapy
  4. D
    Initiate a combination of sertraline and selegiline therapy
  5. E
    Initiate levothyroxine therapy

Answer

The most appropriate next step is to initiate quetiapine therapy.
The correct intervention is to initiate quetiapine therapy. Although this patient is currently presenting with a severe depressive episode, a thorough review of her psychiatric history reveals a diagnosis of Bipolar I Disorder. Three years ago, she experienced an antidepressant-induced manic episode characterized by a decreased need for sleep, impulsivity (spending her life savings, traveling to a foreign continent), and functional deterioration requiring hospitalization. According to DSM-5 criteria, a full manic episode that emerges during antidepressant treatment and persists beyond the physiological effect of the treatment is sufficient to diagnose Bipolar I Disorder. When a patient with Bipolar I Disorder presents with an acute depressive episode, the standard of care is to initiate a medication with established efficacy for bipolar depression, such as specific atypical antipsychotics (e.g., quetiapine, lurasidone, cariprazine) or mood stabilizers (e.g., lithium, lamotrigine). Quetiapine is an excellent first-line choice because it acts rapidly to treat both the depressed mood and the associated severe insomnia.

Step-by-Step Solution

1
Analyze the patient's current clinical presentation.
The patient is experiencing a severe major depressive episode characterized by hypersomnia, profound sadness, functional impairment, and passive suicidal ideation.
Establishing the current affective state is required before determining pharmacological needs.
2
Evaluate the psychiatric history for differentiating features between unipolar and bipolar depression.
The patient has a history of an antidepressant-induced manic episode (decreased sleep, reckless spending, impulsive travel) requiring hospitalization.
According to DSM-5, a full manic episode that emerges during antidepressant treatment and persists beyond the physiological effect of the drug establishes a diagnosis of Bipolar I Disorder.
3
Select the appropriate pharmacotherapy for acute bipolar depression.
Quetiapine (an atypical antipsychotic) is selected. Antidepressant monotherapy must be avoided.
In Bipolar I Disorder, antidepressant monotherapy is contraindicated due to the high risk of precipitating a manic switch. First-line treatments for bipolar depression include quetiapine, lurasidone, or mood stabilizers like lithium.

Key Concept

Prior to initiating pharmacotherapy for a major depressive episode, it is critical to screen for a history of mania or hypomania (including antidepressant-induced episodes). Patients with Bipolar I Disorder who present with depression should be treated with an atypical antipsychotic approved for bipolar depression (e.g., quetiapine, lurasidone) or a mood stabilizer, rather than antidepressant monotherapy.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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