A nurse in the emergency department is caring for a client who has serotonin syndrome. The nurse should assess the client for which of the following manifestations?

Choice A reason: Bradycardia is not typical of serotonin syndrome. Instead, clients often present with tachycardia due to autonomic instability. Bradycardia would suggest other etiologies and is not a hallmark sign. Choice B reason: Priapism is associated with certain psychotropic medications, particularly trazodone, but it is not a recognized symptom of serotonin syndrome. It is unrelated to serotonergic excess. Choice C reason: Hyperpyrexia, or extremely elevated body temperature, is a key feature of serotonin syndrome. It results from increased neuromuscular activity and autonomic dysfunction. This symptom can be life-threatening and requires immediate intervention. Choice D reason: Paresthesia may occur in various neurological conditions but is not a defining symptom of serotonin syndrome. The syndrome is characterized more by hyperreflexia, clonus, and autonomic instability than sensory disturbances.