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Difficulty: MediumDepressive Disorders

A 67-year-old man is evaluated by the consultation-liaison psychiatry team on the medical floor. He was admitted one week ago for a non-ST-elevation myocardial infarction and subsequently developed a complicated soft-tissue infection at the catheter insertion site, for which he is currently receiving intravenous linezolid. The nursing staff reports that the patient has been increasingly withdrawn, tearful, and refusing to participate in physical therapy. During the interview, the patient is fully oriented and demonstrates intact decision-making capacity. He reports a two-month history of a profoundly depressed mood, pervasive anhedonia, early morning awakenings, a 5-kg (11-lb) weight loss, and hearing a voice repeatedly telling him he is a "total failure." He states, "I just have no energy left to fight, but I definitely do not want any sort of shock treatments." His wife, who is present, privately tells the physician, "He doesn't know what he's saying. I give you full permission to do electroconvulsive therapy if it will fix this." Review of his past medical history reveals an episode at age 26 when he was hospitalized for a week after staying awake for five consecutive days and recklessly spending his life savings on an impulsive business venture. Which of the following is the most appropriate next step in the psychiatric management of this patient?

  1. A
    Initiate venlafaxine therapy
  2. B
    Diagnose brief psychotic disorder and initiate haloperidol therapy
  3. C
    Proceed with electroconvulsive therapy after obtaining consent from his wife
  4. D
    Initiate citalopram therapy
  5. Initiate quetiapine therapyAnswer

Answer

Initiate quetiapine therapy
The patient's presentation of a major depressive episode with a historical manic episode confirms a diagnosis of Bipolar I Disorder, currently in a depressed phase with psychotic features. Quetiapine is a first-line, FDA-approved monotherapy for bipolar depression that will also target his auditory hallucinations. Importantly, it avoids the risk of inducing a manic switch (seen with traditional antidepressants), respects his competent refusal of ECT, and does not carry an absolute contraindication with linezolid (unlike SSRIs/SNRIs, which risk serotonin syndrome).

Step-by-Step Solution

1
Analyze the psychiatric presentation and timeline.
The patient has a 2-month history of severe depression with psychotic features (auditory hallucinations).
Establishing the current syndrome is the first step in psychiatric diagnosis.
2
Screen past medical history for prior mood episodes.
The patient has a distinct history of a severe manic episode (hospitalization, decreased need for sleep, impulsivity) at age 26.
A single manic episode changes the diagnosis from Major Depressive Disorder to Bipolar I Disorder, fundamentally altering management.
3
Evaluate current non-psychiatric treatments for potential drug interactions.
The patient is receiving linezolid, an antibiotic that acts as a reversible, non-selective monoamine oxidase inhibitor (MAOI).
MAOIs combined with serotonergic agents (SSRIs, SNRIs) can cause fatal serotonin syndrome.
4
Assess the ethical and legal implications of the wife's request.
The patient has intact decision-making capacity and explicitly refuses electroconvulsive therapy (ECT).
Autonomy dictates that a competent patient's refusal of care supersedes a family member's wishes.
5
Select the optimal management strategy.
Quetiapine is selected.
As an atypical antipsychotic, it is first-line for bipolar depression, treats the psychotic features, avoids the risk of manic switch, and does not precipitate serotonin syndrome with linezolid.

Key Concept

Bipolar depression management requires avoiding antidepressant monotherapy due to manic switch risk; atypical antipsychotics effectively treat both mood and psychotic symptoms while respecting patient autonomy and avoiding critical pharmacological interactions.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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