Which signs indicate tension pneumothorax?

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Multiple Choice

Which signs indicate tension pneumothorax?

Recognizing tension pneumothorax comes from understanding how an air leak under pressure collapses a lung and then compresses the heart and great vessels. The rising intrathoracic pressure shifts the mediastinum, impedes venous return, and leads to rapid cardiovascular and respiratory compromise. The classic signs reflect that progression: the affected side has absent or markedly reduced breath sounds due to lung collapse; neck veins become distended from impaired drainage; the trachea may deviate away from the injured side as pressure builds (this is a late sign); the heart rate climbs as the body copes with reduced cardiac output; and chest pain from lung stretch and hypoxia accompanies these changes. This combination—absent lung sounds on the affected side, JVD or tracheal deviation, tachycardia, and chest pain—best fits tension pneumothorax. The other options don’t align with this pattern: clear lung sounds and normal oxygen saturation argue against tension pneumothorax; hypotension without JVD is less specific because JVD is commonly present; a normal chest radiograph isn’t reliable for ruling it out in the acute setting, since the condition is a clinical emergency and radiographs may not reflect the tension at its peak.

Recognizing tension pneumothorax comes from understanding how an air leak under pressure collapses a lung and then compresses the heart and great vessels. The rising intrathoracic pressure shifts the mediastinum, impedes venous return, and leads to rapid cardiovascular and respiratory compromise. The classic signs reflect that progression: the affected side has absent or markedly reduced breath sounds due to lung collapse; neck veins become distended from impaired drainage; the trachea may deviate away from the injured side as pressure builds (this is a late sign); the heart rate climbs as the body copes with reduced cardiac output; and chest pain from lung stretch and hypoxia accompanies these changes. This combination—absent lung sounds on the affected side, JVD or tracheal deviation, tachycardia, and chest pain—best fits tension pneumothorax.

The other options don’t align with this pattern: clear lung sounds and normal oxygen saturation argue against tension pneumothorax; hypotension without JVD is less specific because JVD is commonly present; a normal chest radiograph isn’t reliable for ruling it out in the acute setting, since the condition is a clinical emergency and radiographs may not reflect the tension at its peak.

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