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Zorluk: OrtaPsychopharmacology and Psychological Therapies

Emergency medical services bring a 26-year-old woman to the hospital due to severe agitation and confusion that began abruptly this morning. According to her roommate, the patient has been recovering from an upper respiratory tract infection over the past few days and recently started taking a new over-the-counter syrup for a persistent, dry cough. Her only daily prescription medication is citalopram for major depressive disorder. Upon arrival, the patient appears profoundly restless and disoriented. Vital signs show a temperature of 38.9°C (102.0°F), blood pressure of 162/94 mm Hg, heart rate of 128/min, and respiratory rate of 22/min. Physical examination reveals warm, diaphoretic skin and visibly dilated pupils. She has continuous rhythmic muscle twitching in her lower extremities, brisk patellar reflexes (4+ bilaterally), and sustained ankle clonus. Which of the following active ingredients is most likely present in the cough medication this patient consumed?

  1. A
    Diphenhydramine
  2. DextromethorphanCevap
  3. C
    Pseudoephedrine
  4. D
    Guaifenesin
  5. E
    Acetaminophen

Cevap

Dextromethorphan
The patient's presentation of altered mental status, autonomic instability (fever, tachycardia, hypertension, diaphoresis), and neuromuscular hyperactivity (hyperreflexia, sustained ankle clonus) in the context of taking an SSRI (citalopram) is highly characteristic of serotonin syndrome. Dextromethorphan, a widely available over-the-counter antitussive, acts as a weak serotonin reuptake inhibitor in addition to its NMDA receptor antagonism. When combined with other serotonergic agents like SSRIs, MAOIs, or SNRIs, dextromethorphan can precipitate life-threatening serotonin toxicity. Recognizing this dangerous psychiatric drug interaction is critical in acute care settings.

Adım Adım Çözüm

1
Analyze the patient's presenting symptoms and vital signs.
The patient exhibits altered mental status, autonomic hyperactivity (fever, tachycardia, hypertension, diaphoresis), and neuromuscular excitability (hyperreflexia, clonus).
To establish a primary clinical syndrome from the physical exam findings.
2
Correlate the clinical syndrome with the patient's medication history.
The triad of symptoms in a patient taking citalopram (an SSRI) strongly indicates serotonin syndrome.
To identify the underlying pathophysiology causing the acute presentation.
3
Identify the over-the-counter medication that could precipitate this syndrome.
Dextromethorphan has serotonin reuptake inhibition properties and can trigger serotonin syndrome when combined with an SSRI.
To determine the precipitating agent and answer the specific question.

Anahtar Kavram

Serotonin syndrome can be precipitated by combining SSRIs with over-the-counter dextromethorphan due to its serotonergic activity.
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Psychopharmacology and Psychological Therapies

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