What does absent lung sounds after trauma indicate?

• A. Tension pneumothorax
• B. Pneumonia
• C. Pulmonary edema
• D. Asthma

Answer: (A)

Injury with absent breath sounds on one side points to a pneumothorax that has become tension physiology. When trauma tears the lung or chest wall, air can leak into the pleural space. If a one-way-valve effect develops, air under pressure builds in that space, the affected lung collapses, and the breath sounds disappear on that side. The pressure also pushes the mediastinum and can impair venous return, leading to rapid instability. This is a true emergency, so immediate needle decompression to relieve the pressure, followed by chest tube placement, is essential along with rapid reassessment and supportive care.

Pneumonia would present with fever or chills, cough, and crackles or dullness rather than sudden unilateral absence of breath sounds after trauma. Pulmonary edema typically shows diffuse crackles, dyspnea, and signs of fluid overload rather than an abrupt unilateral finding. Asthma causes diffuse wheezing and often decreased breath sounds but not the sudden, unilateral loss of sound that follows chest trauma.