Mucus plugs are also common in children, people with cystic fibrosis and during severe asthma attacks.
Suctioning the lungs during surgery helps clear them, but sometimes they still build up. Drugs given during surgery make you breathe less deeply, so normal secretions collect in the airways. It commonly occurs during and after surgery because you can't cough. A mucus plug is a buildup of mucus in your airways. Obstructive atelectasis may be caused by many things, including: It often occurs after heart bypass surgery. Nearly everyone who has major surgery develops some amount of atelectasis. It changes your regular pattern of breathing and affects the exchange of lung gases, which can cause the air sacs (alveoli) to deflate. General anesthesia is a common cause of atelectasis. Atelectasis occurs from a blocked airway (obstructive) or pressure from outside the lung (nonobstructive).
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