What does the term "atelectasis" refer to?

The term "atelectasis" refers specifically to the collapse or closure of a lung or a part of a lung. This condition occurs when the alveoli—the tiny air sacs in the lungs—become deflated or filled with fluid, preventing them from properly exchanging oxygen and carbon dioxide. This can lead to reduced lung volume and impaired gas exchange, which may result in respiratory complications or symptoms like shortness of breath and decreased oxygen levels in the blood. Understanding atelectasis is crucial for recognizing how various conditions might lead to reduced lung function and for implementing appropriate treatment strategies to re-expand the affected lung areas.