问题
单项选择题
While inspecting the client’s chest, the nurse notes that the chest wall contracts on inspiration and bulges on expiration. The nurse suspects which of the following problem from this assessment（）
A. Hemothorax.
B. Flail chest.
C. Pneumothorax.
D. Tension pneumothorax.
答案
参考答案：B
解析：
Flail chest occurs when two or more adjacent ribs are fractured at two or more sites, resulting in a free-floating segment. This loss of chest wall stability causes respiratory impairment and notable paradoxical chest wall movement. Hemothorax or pneumothorax both decrease chest wall excursion on the affected side. A tension pneumothorax causes a mediastinal shift and tracheal deviation toward the unaffected side.