Which sign is a hallmark of a tension pneumothorax in a trauma patient?

Which sign is a hallmark of a tension pneumothorax in a trauma patient?

• A. Bilateral clear breath sounds with stable blood pressure.
• B. Unilateral decreased or absent breath sounds, hypotension, and tracheal deviation in some cases.
• C. Hyperresonant percussion with dullness.
• D. Widened mediastinum on imaging.

Answer: (B)

Tension pneumothorax occurs when air becomes trapped under pressure in the pleural space, pushing on the lung and mediastinal structures. That pressure collapses the affected lung and compresses the heart and great vessels, which severely reduces venous return and drops blood pressure. Because of the lung collapse, you hear decreased or absent breath sounds on the affected side, which is a key clinical clue. The mediastinal shift that can accompany this condition may push the trachea away from the affected side, a sign you may see in some cases. So the combination of unilateral decreased or absent breath sounds with hypotension—and sometimes tracheal deviation—fits tension pneumothorax perfectly. Hyperresonant percussion can occur with pneumothorax but isn’t specific to the tension state. Dullness would suggest fluid rather than air in the chest, and a widened mediastinum on imaging points to other injuries like aortic disruption. This is why the described signs are the best match for a tension pneumothorax in a trauma patient.

Tension pneumothorax occurs when air becomes trapped under pressure in the pleural space, pushing on the lung and mediastinal structures. That pressure collapses the affected lung and compresses the heart and great vessels, which severely reduces venous return and drops blood pressure. Because of the lung collapse, you hear decreased or absent breath sounds on the affected side, which is a key clinical clue. The mediastinal shift that can accompany this condition may push the trachea away from the affected side, a sign you may see in some cases.

So the combination of unilateral decreased or absent breath sounds with hypotension—and sometimes tracheal deviation—fits tension pneumothorax perfectly. Hyperresonant percussion can occur with pneumothorax but isn’t specific to the tension state. Dullness would suggest fluid rather than air in the chest, and a widened mediastinum on imaging points to other injuries like aortic disruption. This is why the described signs are the best match for a tension pneumothorax in a trauma patient.