A 42-year-old man from Mumbai with a history of type 2 diabetes presents to the emergency department with acute onset severe hyperthermia (core temperature 40.8°C), profuse diaphoresis, muscle rigidity, and altered mental status. His wife reports he started taking a newly prescribed medication 3 days ago for depression. Serum creatine kinase is 3200 U/L (normal <200), and urine myoglobin is positive. Vital signs: HR 118/min, BP 168/95 mmHg, RR 24/min. What is the most appropriate immediate next step in management?

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