In a patient with suspected tension pneumothorax, which sign would be most concerning?

• A. Hypotension with absent or diminished breath sounds on the affected side and potential tracheal deviation.
• B. Hyperresonant sound bilaterally.
• C. Normal vitals.
• D. No chest movement with normal pulse.

Answer: (A)

In tension pneumothorax, the most concerning sign is the one that shows the patient’s circulation is being rapidly compromised. Hypotension with absent or diminished breath sounds on the affected side, often accompanied by tracheal deviation away from the side of the problem, reflects the life‑threatening pressure building in the chest. That pressure pushes the mediastinum and great vessels, reducing venous return to the heart and lowering cardiac output, which is why the patient becomes hypotensive. The decreased breath sounds on the affected side come from the lung being compressed and collapsed.

Context helps: tension pneumothorax is not just a collapsed lung; the air trapped under pressure shifts the mediastinum and compromises circulation. The other signs described in the options don’t indicate this same urgent combination. Bilateral hyperresonance can occur with other forms of pneumothorax but isn’t the classic unilateral mediastinal shift seen in tension. Normal vital signs don’t reflect the dangerous physiologic instability, and hearing no chest movement with a normal pulse doesn’t capture the specific pattern of hemodynamic collapse from mediastinal shift.