The main factor for suspecting a tension pneumothorax is:

• A. A penetrating chest wound
• B. A closed chest wound
• C. A punctured airway
• D. A skull fracture

Answer: (A)

A tension pneumothorax occurs when air enters the pleural space and cannot escape, causing increasing intrathoracic pressure that collapses the lung and shifts the heart and great vessels. This life-threatening situation is most strongly suggested by a penetrating chest wound because such injuries provide a direct entry point for air to leak into the pleural space with each breath, facilitating a one-way valve effect that rapidly worsens the pressure buildup. A closed chest wound can cause pneumothorax, but it’s less specific for the tension physiology since it doesn’t as reliably create the ongoing air leak under pressure. A punctured airway mainly disrupts the airway itself rather than generating the dangerous pleural air buildup, and a skull fracture involves the head, not the chest, so it doesn’t point toward a tension pneumothorax.