Which statement correctly differentiates closed and open pneumothoraces and their management?

• A. Closed pneumothorax has intact chest wall; open pneumothorax has a chest wall defect and is managed with a three-sided dressing; tension pneumothorax requires urgent decompression
• B. Closed pneumothorax has a chest wall defect; open pneumothorax has an intact chest wall and is managed with a three-sided dressing; tension pneumothorax is treated with antibiotics
• C. A closed pneumothorax requires immediate chest tube insertion; open pneumothorax never needs decompression
• D. Open pneumothorax is not a concern and is managed with observation

Answer: (A)

The key idea is that the difference between closed and open pneumothorax is whether the chest wall remains intact. A closed pneumothorax has air in the pleural space with the chest wall intact, so there isn’t a communication with the outside world. Management depends on size and stability, but many cases are observed with supplemental oxygen or treated with a chest tube if the lung needs re-expansion.

An open pneumothorax, on the other hand, has a chest wall defect. Air can move between the atmosphere and the pleural space, which is dangerous because it can convert into a life-threatening tension physiology. The classic treatment is a three-sided dressing placed over the wound to allow air to escape while preventing air from being sucked back in during inspiration; this helps avoid progression to a tension pneumothorax. Some patients may eventually need chest tube placement after the initial dressing.

A tension pneumothorax is a result of air entering the pleural space but not escaping, causing rapid buildup that shifts the mediastinum and compromises ventilation and circulation. It requires immediate decompression, typically with needle thoracostomy followed by chest tube insertion.

So the statement aligns the chest wall status with the appropriate management: a chest wall defect characterizes an open pneumothorax treated with a three-sided dressing, and tension pneumothorax demands urgent decompression.