Open pneumothorax initial management?

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Open pneumothorax happens when a chest wall wound allows air to move into the pleural space with each breath, causing lung collapse and raising the risk of a tension pneumothorax if air keeps entering. The initial goal is both to prevent air from entering through the wound and to relieve the trapped air to re-expand the lung.

An occlusive dressing taped on three sides serves as a flutter valve: it seals the wound to block air entry during inspiration while still allowing air to escape, reducing the chance of a tension pneumothorax. But this alone doesn’t remove the existing air or fix the leak; definitive treatment requires draining the pleural space with a chest tube to re-expand the lung and stop ongoing air leakage.

So, combining an occlusive dressing with chest tube placement soon after provides immediate protection and definitive management. Without the dressing, air can keep entering through the wound; without the chest tube, the lung may not re-expand.