单选题 The immobile adolescent with a recent fractured femur suddenly complains chest pain, dyspnea, diaphoresis, and tachycardia. Which of the following would the nurse suspect?
A. Atelectasis.
B. Pneumonia.
C. Pulmonary edema.
D. Pulmonary emboli.

【正确答案】 D

【答案解析】Chest pain and dyspnea in an immobilized adolescent with a large bone fracture suggest a fat embolus. With this condition, fat droplets, rather than a thrombus, are transferred from the marrow into the general blood stream by the venous-arterial route, possibly reaching the lung or brain.