The emergency department nurse is assessing a patient who has been in an automobile accident. Which clinical manifestation illustrates a tension pneumothorax?

A. Paradoxic movement of the chest is noted: Paradoxical chest movement is characteristic of a flail chest, where a segment of the rib cage moves in the opposite direction during respiration. While both conditions are life-threatening, flail chest involves structural instability rather than the rapid intrathoracic pressure changes seen in tension pneumothorax. B. Sucking sound with each patient breath: A sucking sound, or "sucking chest wound," is associated with an open pneumothorax, where air enters the pleural space through a chest wall defect. Unlike tension pneumothorax, this condition does not create progressive mediastinal shift or hemodynamic compromise. C. Wheezes are audible throughout both lungs: Wheezing indicates airway obstruction or bronchospasm, commonly seen in asthma or COPD exacerbations. It does not reflect the pathophysiology of tension pneumothorax, which primarily involves pleural pressure buildup and compression of mediastinal structures. D. Tracheal deviation to the unaffected side: Tracheal deviation away from the affected side is a hallmark sign of tension pneumothorax. As air accumulates in the pleural space under pressure, it shifts the mediastinum, compresses the heart and great vessels, and can rapidly lead to decreased cardiac output and life-threatening hypotension. Immediate needle decompression is required.