Which of the following symptoms is associated with Serotonin Syndrome?

The correct symptom associated with Serotonin Syndrome is muscle rigidity. Serotonin Syndrome is a potentially life-threatening condition caused by excessive serotonergic activity within the central nervous system, commonly resulting from the use of certain medications, such as SSRIs, SNRIs, or MAOIs.

Muscle rigidity is a hallmark feature of Serotonin Syndrome and is often accompanied by other motor symptoms, such as myoclonus or hyperreflexia. This rigidity occurs due to the overactivity of serotonin in the motor pathways of the central nervous system, leading to increased muscle tone and stiffness.

Other common symptoms of Serotonin Syndrome may include altered mental status (e.g., agitation, confusion), autonomic instability (such as increased heart rate and blood pressure), and gastrointestinal disturbances. Diarrhea can occur in the context of autonomic changes, but it is not a defining symptom of the syndrome.

Bradycardia is generally not a symptom associated with Serotonin Syndrome; in fact, tachycardia is more frequently observed. Facial tics are not typical of Serotonin Syndrome either; they are more related to other movement disorders or side effects from certain medications.