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Question

Difficulty: MediumDepressive Disorders

A 28-year-old woman is brought to the outpatient clinic by her husband for evaluation of abnormal behavior and low mood. For the past 10 weeks, she has exhibited profound sadness, extreme fatigue, and hypersomnia, often sleeping 14 hours a day. Her husband reports that for the last 6 weeks, she has been responding to unseen stimuli and admits to hearing a persistent voice calling her a "worthless failure."

Two years ago, the patient experienced a 2-week episode of euphoric mood, boundless energy, and rapid speech. During that time, she slept only 2 hours a night and spent the couple's entire savings on unneeded luxury goods, which required a brief psychiatric hospitalization.

She currently takes no medications but asks if she can be started on a combination of a selective serotonin reuptake inhibitor (SSRI) and a monoamine oxidase inhibitor (MAOI), as she read online that this combination is highly effective for severe depression.

Laboratory evaluation shows:
Thyroid-stimulating hormone (TSH): 1.8 µU/mL (Normal: 0.5-5.0 µU/mL)
Free thyroxine (T4): 0.5 ng/dL (Normal: 0.9-1.7 ng/dL)

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

  1. A
    Initiate sertraline monotherapy
  2. B
    Initiate combined therapy with fluoxetine and phenelzine
  3. C
    Diagnose brief psychotic disorder and initiate haloperidol therapy
  4. D
    Diagnose primary hypothyroidism and initiate levothyroxine therapy
  5. Initiate quetiapine monotherapyAnswer

Answer

Initiate quetiapine monotherapy
The correct action is to initiate quetiapine monotherapy. This patient has Bipolar I disorder, as evidenced by her past manic episode (euphoria, decreased sleep, impulsivity requiring hospitalization). She is currently experiencing a major depressive episode with psychotic features (sadness, hypersomnia, and auditory hallucinations). Quetiapine is a second-generation (atypical) antipsychotic with proven efficacy as monotherapy for bipolar depression. It is particularly appropriate in this case as it simultaneously treats the depressive mood symptoms and the psychotic symptoms without the risk of inducing a manic switch.

Step-by-Step Solution

1
Identify the current clinical syndrome.
The patient has a 10-week history of severe depression with 6 weeks of auditory hallucinations, indicating a major depressive episode with psychotic features.
Accurate characterization of the current episode is required to guide treatment.
2
Review the patient's past psychiatric history.
The patient had a distinct 2-week episode of euphoria, decreased need for sleep, and impulsivity requiring hospitalization, which meets the criteria for a manic episode.
A history of mania changes the diagnosis from Major Depressive Disorder to Bipolar I Disorder.
3
Select the appropriate pharmacotherapy.
Quetiapine monotherapy is selected.
Atypical antipsychotics such as quetiapine are first-line treatments for bipolar depression with psychotic features, as they avoid the risk of antidepressant-induced manic switching.

Key Concept

Patients presenting with depressive episodes must be screened for a history of mania to differentiate unipolar depression from bipolar disorder; bipolar depression is treated with mood stabilizers or specific atypical antipsychotics to avoid inducing a manic episode.
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Topics

Depressive Disorders

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