Review Question - QID 213760

A 57-year-old man with a past medical history of diabetes, hypertension, depression, and peripheral vascular disease presents to the emergency department after a motor vehicle collision. He was the unrestrained driver in a head-on collision. The patient is obtunded and can offer no history. His medications include insulin, aspirin, metoprolol, sertraline, mirtazapine, fiber supplements, and lisinopril. He is subsequently intubated, and a trauma workup is notable for multiple cervical spine fractures without compression of the spinal canal as well as a clavicular fracture and several rib fractures. On day 5 in the trauma ICU, his temperature is 102°F (38.9°C), blood pressure is 107/58 mm Hg, pulse is 110/min, respirations are 20/min, and oxygen saturation is 93% on room air. A chest radiograph is performed as seen in Figure A. Which of the following is the most appropriate treatment for this patient?