Which combination of signs most strongly indicates a pneumothorax in a diver?

• A. Sudden sharp chest pain, short labored breathing, rapid heart rate and weak pulse.
• B. Gradual chest tightness with fever.
• C. Dizziness and hearing loss.
• D. Cough with clear sputum.

Answer: (A)

A pneumothorax in a diver is caused by air leaking into the space around the lung, causing the lung to collapse. This injury often follows pressure changes during a dive, such as an ascent or overexpansion, and it typically presents with sudden, sharp chest pain and shortness of breath because the affected lung can no longer expand properly. When air accumulates rapidly, the diver’s heart must work harder to supply oxygen, leading to a fast pulse and, if the condition worsens, a weakening pulse as blood flow becomes compromised. These signs together—acute chest pain plus severe dyspnea with a rapid, weak pulse—are the strongest combination pointing to a pneumothorax.

The other patterns align with different problems: gradual chest tightness with fever suggests an infectious process like pneumonia; dizziness and hearing loss point more toward inner-ear barotrauma or decompression illness; a cough with clear sputum fits bronchitis or irritation, not a lung collapse. In this context, the abrupt, life-threatening nature of chest pain and breathing difficulty with circulatory signs makes the pneumothorax interpretation the most plausible and urgent. If suspected, treat as an emergency: stop diving, provide oxygen, and seek immediate medical evacuation for evaluation and management.