A 32-year-old man is involved in a vehicular accident and sustains fractures of the right femur and tibia and the left humerus. The fractures are stabilized surgically. He is in stable condition for 2 days, but then suddenly becomes severely dyspneic. Which of the following complications from his injuries is the most likely cause of his sudden respiratory difficulty?
Cardiac tamponade Fat embolism Pulmonary edema Pulmonary infarction