Which combination of signs characterizes a tension pneumothorax?

• A. Hypotension, distended neck veins, absent breath sounds over the affected side, and tracheal deviation
• B. Hyperresonance with decreased breath sounds
• C. Shortness of breath with clear lungs
• D. Hypotension with hypoxia only

Answer: (D)

Tension pneumothorax is driven by a rapid rise in intrathoracic pressure that compresses the heart and great veins, markedly impairing circulation and shifting the mediastinal structures. The signs that best reflect this process are hypotension from reduced venous return, distended neck veins from the same venous compression, absent or markedly decreased breath sounds on the side of the affected lung due to collapse, and tracheal deviation away from the side of the pneumothorax as the mediastinum is pushed off balance. This combination signals a life-threatening emergency requiring immediate decompression.

Other options don’t capture the same critical pattern. Hyperresonance with decreased breath sounds can occur with a pneumothorax but doesn’t by itself indicate the hemodynamic collapse and mediastinal shift seen in a tension physiology. Shortness of breath with clear lungs and hypotension with hypoxia alone lack the unilateral lung findings and mediastinal shift that define tension pneumothorax.