Final answer:
Pneumothorax is the term for a sudden accumulation of air in the pleural space, commonly seen in COPD patients and caused by a rupture of certain types of lung blisters.
Step-by-step explanation:
The term for a sudden accumulation of air in the pleural space, commonly seen in COPD patients and caused by a rupture of certain types of lung blisters, is Pneumothorax. Pneumothorax occurs when air leaks into the pleural space, causing the lung to collapse partially or completely. This can lead to symptoms such as sudden chest pain, difficulty breathing, and decreased breath sounds on one side of the chest.