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Difficulty: EasyDepressive Disorders

A 31-year-old male accountant presents to the clinic for an urgent follow-up appointment. He initially presented two weeks ago with a one-month history of severe sadness, hypersomnia, and profound anhedonia. At that time, he was diagnosed with a major depressive episode and prescribed fluoxetine. Today, he reports that his mood has not improved, but he now feels "extremely irritable, wired, and completely unable to sit still." His physical examination is notable for rapid, pressured speech and psychomotor agitation. Upon detailed psychiatric review, the patient admits that he experienced a similar "wired" state twice in his twenties. During those episodes, which each lasted approximately ten days, he required only two hours of sleep per night and impulsively spent thousands of dollars on unneeded electronics. He has no significant past medical history and denies any illicit substance use. Which of the following is the most appropriate next step in management?

  1. Discontinue the fluoxetine and initiate treatment with a mood stabilizer such as quetiapineAnswer
  2. B
    Increase the fluoxetine dosage to provide optimized monotherapy for the underlying depressive symptoms
  3. C
    Discontinue the fluoxetine and provide observation alone, as these symptoms represent a temporary adjustment reaction
  4. D
    Add a secondary antidepressant to the current regimen without re-evaluating his history for past manic episodes
  5. E
    Order a comprehensive urine toxicology screen to rule out a substance-induced mood disorder before altering medications

Answer

The most appropriate next step is to discontinue the selective serotonin reuptake inhibitor (fluoxetine) and initiate treatment with a mood stabilizer or atypical antipsychotic (such as quetiapine).
The patient's history of episodes involving decreased sleep, impulsivity, and a "wired" state lasting approximately 10 days confirms a diagnosis of Bipolar I Disorder. His initial presentation of a depressive episode was misdiagnosed as unipolar major depressive disorder. Initiating fluoxetine (an SSRI) as monotherapy in a patient with bipolar disorder has precipitated a manic switch, characterized by his current pressured speech, irritability, and psychomotor agitation. The most critical next step is to immediately discontinue the offending antidepressant and initiate an appropriate treatment for bipolar depression, such as the atypical antipsychotic quetiapine.

Step-by-Step Solution

1
Identify the patient's initial diagnosis and current presentation.
The patient was initially diagnosed with major depressive disorder and given an SSRI. He now presents with agitation, irritability, and pressured speech.
Tracking the timeline of symptoms relative to medication initiation is critical for identifying adverse drug effects.
2
Analyze the newly obtained psychiatric history.
The patient has a history of distinct episodes lasting at least 7 days characterized by decreased need for sleep, impulsivity, and euphoric/wired mood.
These historical symptoms meet the DSM-5 criteria for past manic episodes, changing the baseline diagnosis from unipolar depression to Bipolar I Disorder.
3
Determine the etiology of the current acute symptoms.
The current agitation and pressured speech represent a manic switch or severe activation syndrome triggered by antidepressant monotherapy in a patient with bipolar disorder.
Selective serotonin reuptake inhibitors can precipitate manic episodes in patients with underlying bipolar disorder.
4
Select the appropriate pharmacological intervention.
The offending agent (fluoxetine) must be discontinued, and an appropriate medication for bipolar depression (e.g., quetiapine, lurasidone, or lithium) must be started.
Antidepressant monotherapy is contraindicated in Bipolar I Disorder. Mood stabilizers or specific atypical antipsychotics are the standard of care.

Key Concept

Patients presenting with depressive symptoms must be screened for a history of mania or hypomania prior to initiating antidepressant monotherapy to prevent precipitating a manic switch.
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Depressive Disorders

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