Which signs would prompt you to suspect a tension pneumothorax in the field, and what is the immediate action?

• A. Signs: mild chest pain only; action: slowly evacuate.
• B. Signs: sudden severe dyspnea, hypotension, tracheal deviation, diminished breath sounds on affected side, neck vein distention. Action: evacuate immediately; provide high-flow oxygen if available; avoid invasive procedures unless trained.
• C. Signs: fever and cough; action: give antibiotics.
• D. Signs: stable vitals; action: watchful waiting.

Answer: (B)

In tension pneumothorax, the body rapidly deteriorates from air trapped in the chest first collapsing a lung and then pressing the heart and great vessels, so you look for signs of sudden respiratory collapse with compromised circulation. The defining field signs are sudden severe shortness of breath, hypotension, tracheal deviation away from the injured side, diminished or absent breath sounds on the affected side, and neck vein distention from impaired venous return. These together point to a life-threatening pressure build-up that needs immediate action.

The best response is to evacuate immediately to definitive care and provide high-flow oxygen if available. Oxygen supports tissue oxygenation during shock and critical airway compromise. Invasive procedures, like needle decompression or chest tube placement, are life-saving only when performed by someone trained; attempting them without proper training risks serious harm. Therefore, rapid evacuation with oxygen is the appropriate field management.

The other options don’t fit because mild chest pain with slow evacuation isn’t consistent with a rapidly developing tension pneumothorax; fever and cough suggest infection rather than a compressive thoracic emergency; stable vitals with watchful waiting ignores the danger of an evolving crisis.