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Difficulty: MediumDepressive Disorders

A son brings his 68-year-old mother to the geriatric psychiatry clinic due to a 6-week history of profound lethargy, worsening sadness, and uncharacteristic behavior. He reports that she now spends most of her day in bed and has lost 4.5 kg (10 lb) due to a near-total loss of appetite. During the interview, the patient repeatedly states that her internal organs are 'turning to dust' as a punishment for her past sins, and she mentions hearing a male voice that agrees with her. Her medical history includes severe osteoarthritis, for which she takes scheduled tramadol and acetaminophen. A review of her past psychiatric history reveals that at age 40, she experienced a 3-week episode characterized by a severely decreased need for sleep, rapid and pressured speech, and grandiose plans to start a nationwide business, which resulted in an involuntary psychiatric hospitalization. She was treated with medication at the time but discontinued it shortly after discharge and has not taken any psychiatric medications since. Vital signs are within normal limits. Physical examination is unremarkable. Which of the following is the most appropriate next step in management?

  1. A
    Fluoxetine and olanzapine
  2. QuetiapineAnswer
  3. C
    Risperidone
  4. D
    Sertraline
  5. E
    Venlafaxine

Answer

The correct answer is to initiate quetiapine, as it is a first-line agent for bipolar depression that simultaneously addresses her psychotic features without interacting dangerously with tramadol.
The correct answer is to initiate quetiapine. This patient's presentation of a severe depressive episode (sadness, lethargy, weight loss) complicated by psychotic features (somatic delusions and auditory hallucinations), combined with a clear history of a manic episode, establishes the diagnosis of bipolar I disorder, current episode depressed with psychotic features. Quetiapine is a second-generation antipsychotic that has demonstrated efficacy as a first-line monotherapy for bipolar depression. It provides the necessary mood stabilization while simultaneously targeting her acute psychotic symptoms. Furthermore, unlike traditional antidepressants, quetiapine does not carry a significant risk of inducing serotonin syndrome when co-administered with her current analgesic, tramadol.

Step-by-Step Solution

1
Evaluate the patient's psychiatric history to establish a baseline diagnosis.
The history of a 3-week episode of decreased sleep, pressured speech, and grandiosity requiring hospitalization confirms a diagnosis of bipolar I disorder.
Recognizing a history of mania is critical to differentiating unipolar depression from bipolar depression and avoiding inappropriate monotherapy.
2
Assess the current clinical presentation.
The patient is experiencing a major depressive episode with psychotic features, evidenced by somatic delusions (organs 'turning to dust') and auditory hallucinations.
Identifying the severity and presence of psychotic features determines the specific class of psychiatric medication required.
3
Review current medications for potential adverse interactions.
The patient is taking tramadol, a weak opioid agonist that also inhibits serotonin reuptake. Adding another strong serotonergic agent risks serotonin syndrome.
Polypharmacy in geriatric patients requires careful screening for drug-drug interactions, particularly regarding serotonergic load.
4
Select the most appropriate pharmacotherapy.
Quetiapine is selected because it is a first-line agent for bipolar depression, treats her psychotic features, and does not have a severe serotonergic interaction with tramadol.
An ideal agent must safely address both mood and psychosis concurrently.

Key Concept

Differentiating unipolar from bipolar depression with psychotic features and selecting appropriate pharmacotherapy while avoiding drug-drug interactions.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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