A 38-year-old man is brought by his wife to the Emergency Department with fatigue, dizziness, and nausea after completing a hiking tour on a hot, humid day. His wife became worried after he had collapsed. He has been sweating heavily and vomited twice on the drive in. His medical history is unremarkable, and he takes no medications. His vital signs on arrival are as follows:
Blood pressure
85/57 mm Hg
Heart rate
120/min
Respiratory rate
18/min
Temperature
40.1 °C
Oxygen saturation
95%, room air
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On physical examination, the patient's skin is dry, flushed, and warm to the touch. He has a diffuse erythematous papular rash. Findings of a thorough physical examination are otherwise unremarkable. An electrocardiogram shows sinus tachycardia. Which one of the following is the best next step?
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