What signs suggest pneumothorax development in a ventilated patient?

• A. Gradual weight gain
• B. Sudden chest pain, hypotension, decreased breath sounds, hyperresonance, subcutaneous emphysema
• C. Hyperactivity
• D. Chronic cough and productive sputum

Answer: (B)

In a ventilated patient, pneumothorax is an abrupt, life-threatening event caused by air leaking into the pleural space from barotrauma. The most telling signs are a sudden chest pain with a drop in blood pressure, a unilateral decrease in breath sounds, hyperresonant percussion on the affected side, and the appearance of subcutaneous emphysema. This constellation reflects air accumulating in the pleural space and, if it advances to a tension pneumothorax, compression of the heart and great vessels leading to hypotension. Recognizing this quickly is crucial because emergent decompression and chest tube placement are needed. Signs like gradual weight gain, hyperactivity, or chronic cough don’t fit an acute pneumothorax in this setting.