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Zorluk: OrtaPsychopharmacology and Psychological Therapies

A 47-year-old man is evaluated in the emergency department for altered mental status, fever, and severe agitation that started a few hours ago. His wife reports that he had been recovering from a minor ankle sprain sustained over the weekend. His medical history is significant for treatment-resistant major depressive disorder, for which he has been taking tranylcypromine for the past two years. His temperature is 39.4°C (102.9°F), blood pressure is 168/105 mm Hg, and pulse is 128/min. On physical examination, the patient is visibly diaphoretic. Neurological examination reveals spontaneous clonus in the lower extremities and horizontal ocular clonus. He recently started taking a new medication prescribed for his ankle sprain. Which of the following medications was most likely prescribed?

  1. TramadolCevap
  2. B
    Hydrocodone
  3. C
    Celecoxib
  4. D
    Methocarbamol
  5. E
    Prednisone

Cevap

Tramadol
The patient's presentation of altered mental status, autonomic hyperactivity (fever, diaphoresis, tachycardia, hypertension), and prominent neuromuscular excitability (spontaneous and ocular clonus) is highly characteristic of serotonin syndrome. This life-threatening toxidrome is most commonly precipitated by the concurrent use of multiple serotonergic medications. The patient is already taking tranylcypromine, an irreversible, nonselective monoamine oxidase inhibitor (MAOI) that strongly inhibits the breakdown of serotonin. Tramadol is an analgesic commonly prescribed for musculoskeletal pain that acts as a weak mu-opioid receptor agonist and also inhibits the reuptake of serotonin and norepinephrine. When combined with an MAOI, the dual mechanism of decreased serotonin metabolism and inhibited serotonin reuptake rapidly leads to toxic synaptic serotonin levels, triggering serotonin syndrome. Therefore, tramadol is strictly contraindicated in patients taking MAOIs.

Adım Adım Çözüm

1
Identify the clinical syndrome based on the physical examination and vital signs.
The combination of altered mental status, autonomic hyperactivity (hyperthermia, tachycardia, hypertension, diaphoresis), and neuromuscular excitability (spontaneous and ocular clonus) strongly indicates serotonin syndrome.
Recognizing the characteristic toxidrome is the critical first step to determining its pharmacological cause.
2
Analyze the patient's baseline medications for potential interactions.
The patient takes tranylcypromine, a nonselective monoamine oxidase inhibitor (MAOI), which significantly increases baseline synaptic serotonin levels by preventing its degradation.
MAOIs are a classic component in severe drug-drug interactions leading to serotonin syndrome.
3
Evaluate the answer choices to identify the medication that would interact with the MAOI to trigger this syndrome.
Among the choices provided for an ankle sprain, only tramadol acts to inhibit serotonin reuptake, making it the precipitating agent.
Understanding the specific mechanisms of action of various analgesics helps isolate the exact cause of the life-threatening adverse reaction.

Anahtar Kavram

Dangerous drug interactions with MAOIs precipitating serotonin syndrome
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Konular

Psychopharmacology and Psychological Therapies

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