Which clinical constellation characterized by autonomic instability, hyperthermia, ocular clonus, tremor, and hyperreflexia distinguishes Serotonin Syndrome under the Hunter criteria?

Answer and explanation

Correct answer: C. Spontaneous clonus with tremor and hyperreflexia

  1. Step 1: Excess central and peripheral serotonergic agonism produces serotonin syndrome, classically seen when combining serotonergic agents like SSRIs and MAOIs.
  2. Step 2: Under the validated Hunter Serotonin Toxicity Criteria, the presence of spontaneous clonus or inducible clonus with agitation and diaphoresis confirms serotonin toxicity.
Answer
Spontaneous clonus with tremor and hyperreflexia.
Why not the others: Severe generalized 'lead-pipe' rigidity with hyporeflexia characterizes Neuroleptic Malignant Syndrome (NMS) rather than Serotonin Syndrome. Flaccid paralysis with hypothermia does not occur in acute serotonergic hyperstimulation. Miosis with anhidrosis reflects sympatholytic or central sedative toxidromes.

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