Which statement correctly distinguishes an open pneumothorax from a closed pneumothorax?

• A. An open pneumothorax is managed with a three-sided vented dressing; a closed pneumothorax is managed with chest tube if needed
• B. An open pneumothorax requires chest tube only; a closed pneumothorax requires no intervention
• C. An open pneumothorax heals spontaneously; a closed pneumothorax never does
• D. An open pneumothorax is treated with full occlusive dressings; a closed pneumothorax with continuous air leak

Answer: (A)

Open pneumothorax involves a chest wall defect that communicates with the atmosphere, so air can move in and out of the pleural space. The initial, life‑saving approach is to cover the wound with a three‑sided vented dressing. Leaving one side open lets air escape and prevents air from being trapped and turning into a tension situation, while still protecting the wound. In contrast, a closed pneumothorax has no chest wall opening, so there isn’t a direct airway into the pleural space; treatment is guided by size and symptoms, and a chest tube is used when drainage of air is needed to allow lung re-expansion. The other statements don’t fit this distinction: treating an open pneumothorax with a full occlusive dressing risks trapping air and causing tension, and saying a closed pneumothorax requires no intervention or that an open one heals on its own ignores the potential for instability and the need for drainage when indicated.