Review Question - QID 216242

A 79-year-old man is brought to the emergency department after being struck by a car while crossing the street. He did not hit his head and did not have a loss of consciousness. He complains of chest pain and right leg pain at this time. His past medical history is significant for hypertension and diabetes for which he takes amlodipine and metformin respectively. In the emergency department, his temperature is 36.8°C (98.2°F), blood pressure is 80/45 mmHg, pulse is 143/min, respirations are 26/min, and oxygen saturation is 85% on 2L nasal cannula. On physical exam, he is using accessory muscles for respiration and cannot speak in full sentences. He has various ecchymoses on his extremities but no obvious deformities. A chest radiograph is obtained and shown in Figure A. Which of the following is the most appropriate next step in management?