A 55-year-old male patient with a history of alcoholism presents to the emergency department during winter with slurred speech, confusion, and a rectal temperature of 34.4°C (93.9°F). He was found outdoors by a passerby. Which of the following is the most appropriate initial management for this patient?
Gradual rewarming using warm blankets and a controlled environment
Immediate immersion in a warm bath to quickly raise core temperature
Administration of room temperature intravenous fluids to maintain hydration