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Difficulty: HardDepressive Disorders

A 24-year-old woman is brought to the emergency department by her husband due to worsening depressive symptoms over the past 3 weeks. She reports feeling profoundly sad, sleeping up to 14 hours a day, and experiencing significant psychomotor retardation. For the past 2 weeks, she has been hearing a persistent voice telling her that she is "worthless and should die," and she admits to having a specific plan to overdose on her medications. Her husband reports that 3 years ago, she had a distinct 1-week period where she barely slept, exhibited grandiose behavior, and engaged in impulsive spending that resulted in severe financial debt. Three days ago, her primary care provider diagnosed her with major depressive disorder and started her on fluoxetine. Laboratory studies reveal a thyroid-stimulating hormone (TSH) level of 0.2 mU/L0.2 \text{ mU/L} (normal: 0.5−5.0 mU/L0.5-5.0 \text{ mU/L}) and a free T4 of 0.6 ng/dL0.6 \text{ ng/dL} (normal: 0.9−1.7 ng/dL0.9-1.7 \text{ ng/dL}). Which of the following is the most appropriate next step in management?

  1. Admit to the inpatient psychiatric unit and initiate quetiapineAnswer
  2. B
    Continue fluoxetine and schedule close outpatient follow-up
  3. C
    Diagnose primary hypothyroidism and initiate levothyroxine therapy
  4. D
    Diagnose schizophreniform disorder and initiate haloperidol monotherapy
  5. E
    Discontinue fluoxetine and immediately initiate phenelzine

Answer

The most appropriate next step is to admit the patient to the inpatient psychiatric unit and initiate quetiapine.
The correct answer addresses two critical factors: patient safety and appropriate psychopharmacology. The patient's active suicidal plan necessitates immediate inpatient psychiatric hospitalization. Diagnostically, her history of a 1-week manic episode establishes Bipolar I Disorder. Her current presentation is a severe bipolar depressive episode with psychotic features (auditory hallucinations). Quetiapine is a first-line treatment for bipolar depression and its antipsychotic properties will concurrently treat her hallucinations. The fluoxetine prescribed by her primary care provider is inappropriate monotherapy for bipolar disorder and should be discontinued.

Step-by-Step Solution

1
Analyze the patient's psychiatric history to establish the primary diagnosis.
The history of a 1-week episode of decreased sleep, grandiosity, and impulsive spending confirms a past manic episode, establishing a diagnosis of Bipolar I Disorder.
A single manic episode is sufficient to diagnose Bipolar I Disorder, fundamentally altering the treatment algorithm for any subsequent depressive episodes.
2
Evaluate the current clinical presentation.
The patient has a 3-week history of severe depression with 2 weeks of mood-congruent auditory hallucinations and a specific suicidal plan.
This presentation indicates a current major depressive episode with psychotic features, which represents a psychiatric emergency.
3
Determine the appropriate setting for care.
Inpatient psychiatric admission is required.
The patient has active suicidal ideation with a specific plan and access to lethal means (medications), making outpatient management unsafe.
4
Select the appropriate pharmacotherapy.
Initiate an atypical antipsychotic approved for bipolar depression, such as quetiapine.
Quetiapine provides established monotherapy efficacy for bipolar depression while simultaneously treating the concurrent psychotic features. Fluoxetine (an SSRI) must be discontinued as it is inappropriate monotherapy for bipolar disorder.

Key Concept

Management of severe Bipolar I depression with psychotic features requires inpatient admission for safety and treatment with medications effective for both mood and psychosis (e.g., quetiapine), while avoiding antidepressant monotherapy.
Estimated Time:2m 0s
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Topics

Depressive Disorders

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