Review Question - QID 216387

A 45-year-old man is brought to the emergency department by ambulance after he was found unresponsive on the sidewalk. Additional collateral history is unable to be obtained. The patient's temperature is 98.7°F (37.0°C), blood pressure is 90/51 mmHg, pulse is 64/min, and respirations are 4/min, shallow, and irregular. Oxygen saturation is 89% on room air. He is unresponsive to voice and does not demonstrate purposeful movement. He withdraws his extremities and opens his eyes to painful stimuli. Pupils are 2 mm and reactive. There are no obvious signs of trauma. Which of the following is the most appropriate next step in management?