What are the hallmark signs of Neuroleptic Malignant Syndrome and the immediate management steps?

• A. Seizures and dehydration; increase the antipsychotic dose.
• B. Hyperthermia, severe rigidity, autonomic instability, altered mental status; stop antipsychotics, monitor vitals, provide supportive care, and initiate protocol-specific interventions.
• C. Miosis and bradycardia; give anticholinergic agents.
• D. Weight gain and sedation; switch to a different class of medication.

Answer: (B)

Neuroleptic Malignant Syndrome presents as a dangerous combination of high fever, severe muscular rigidity, autonomic instability (like fluctuating heart rate and blood pressure), and altered mental status. The immediate management centers on stopping the offending antipsychotic right away, then providing aggressive supportive care: monitor and stabilize vitals, ensure airway and breathing, start cooling measures and IV fluids, and correct any electrolyte imbalances or signs of organ stress. At the same time you begin protocol-directed treatment for NMS, such as giving a muscle relaxant like dantrolene and considering dopamine-activating therapies such as bromocriptine or amantadine to reverse the dopamine blockade. This approach addresses both the provoking factor and the life-threatening physiologic derailment, which is why it’s the best choice. Other options describe signs or treatments that don’t fit NMS—for example, symptoms more typical of overheating with dehydration or anticholinergic toxicity, or side effects like weight gain and sedation from other meds, which do not capture the crisis of NMS or its correct initial management.