Left-sided decreased breath sounds postoperatively could indicate which condition?

• A. Pneumothorax
• B. Pleural effusion
• C. Atelectasis
• D. Bronchospasm

Answer: (A)

Unilateral decrease in breath sounds after surgery points to a problem affecting one side of the chest, most commonly a pneumothorax. When air leaks into the pleural space, the lung on that side may partially or completely collapse, reducing air movement and making auscultated sounds faint or absent over the affected area. In the postoperative setting, pneumothorax can occur from chest procedures, line placements, or barotrauma from ventilation, and it is a potentially serious condition that requires prompt evaluation and often chest tube intervention.

Pleural effusion could also reduce breath sounds, but it typically causes dullness to percussion and develops more gradually as fluid accumulates, not as an abrupt unilateral sound loss. Atelectasis can cause decreased breath sounds too, especially after anesthesia, but it usually involves the bases and may present with crackles or dullness rather than a clear, isolated unilateral quiet. Bronchospasm tends to produce wheezing and prolonged expiration rather than a unilateral lack of breath sounds.