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Zorluk: ZorPsychopharmacology and Psychological Therapies

A 35-year-old male construction worker is brought to the emergency department by his wife due to sudden-onset severe agitation, fever, and muscle stiffness. His medical history is significant for major depressive disorder, for which he has been taking sertraline for the past 2 years. Two days ago, the patient underwent a complex root canal procedure and was prescribed a short course of a centrally acting analgesic. On physical examination, his temperature is 39.4°C (102.9°F), blood pressure is 165/100 mmHg, and heart rate is 118/min. He is diaphoretic, flushed, and noticeably disoriented. Neurologic examination reveals bilateral ankle clonus, marked shivering, and generalized hyperreflexia that is most prominent in the lower extremities. Which of the following describes the mechanism of action of the analgesic that most likely precipitated this patient's current condition?

  1. Inhibition of presynaptic serotonin and norepinephrine reuptakeCevap
  2. B
    Reversible inhibition of cyclooxygenase enzymes
  3. C
    Irreversible inhibition of monoamine oxidase
  4. D
    Activation of voltage-gated calcium channel alpha-2-delta subunits
  5. E
    Agonism at the mu-opioid receptor without monoaminergic activity

Cevap

The correct answer is the inhibition of presynaptic serotonin and norepinephrine reuptake, representing the mechanism of tramadol.
The patient's clinical presentation of altered mental status, autonomic instability, and prominent neuromuscular hyperactivity (hyperreflexia, ankle clonus) in the setting of ongoing sertraline therapy is highly characteristic of serotonin syndrome. The precipitating event was the addition of a centrally acting analgesic. Tramadol is a unique analgesic because, in addition to acting as a weak mu-opioid receptor agonist, it inhibits the presynaptic reuptake of serotonin and norepinephrine. When combined with an SSRI like sertraline, tramadol can lead to excessive central serotonergic neurotransmission, precipitating life-threatening serotonin syndrome.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation.
The patient exhibits autonomic instability (fever, hypertension, tachycardia, diaphoresis), altered mental status (agitation, disorientation), and neuromuscular hyperactivity (hyperreflexia, bilateral ankle clonus).
Identifying the toxidrome is the first step in determining the underlying etiology.
2
Correlate the toxidrome with the patient's medication history.
The clinical picture strongly indicates serotonin syndrome, especially given the patient's baseline use of an SSRI (sertraline).
Serotonin syndrome is a life-threatening condition caused by excessive serotonergic activity in the central nervous system.
3
Identify the precipitating medication.
The patient recently started a centrally acting analgesic for a dental procedure. Among analgesics, tramadol is known to trigger serotonin syndrome when combined with SSRIs.
Tramadol has unique serotonergic properties compared to traditional analgesics.
4
Recall the pharmacologic mechanism of the precipitant.
Tramadol acts as a weak mu-opioid receptor agonist and also inhibits the reuptake of serotonin and norepinephrine.
Answering the question requires matching the identified drug (tramadol) with its precise mechanism of action.

Anahtar Kavram

Serotonin syndrome can be precipitated by combining SSRIs with analgesics that have serotonergic activity, such as tramadol. Recognizing tramadol's dual mechanism of action (mu-opioid agonism and SNRI activity) is critical to avoiding this dangerous drug-drug interaction.
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Psychopharmacology and Psychological Therapies

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