How would you recognize a pneumothorax progressing to tension in the field?

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The key idea is recognizing a tension pneumothorax by signs of both worsening ventilation and compromised circulation from rising intrapleural pressure. As air builds under pressure in the chest, the affected lung collapses and the mediastinum shifts toward the opposite side, which can push the trachea off-center—though this tracheal deviation is often a late finding. That pressure also impedes venous return to the heart, leading to decreased cardiac output and hypotension, with neck veins becoming distended from the backing up of blood. In a field scenario you’d typically see increasing shortness of breath and potentially diminished or absent breath sounds on the affected side, sometimes with a hyperresonant chest. The other options don’t fit because they describe stable or unrelated conditions: normal breathing with stable vitals isn’t consistent with a life-threatening tension event; improving breathing with stable vitals isn’t the pattern; and leg edema has no relevance to an acute thoracic emergency.