Such subglottic ulcers are produced with prolonged endotracheal intubation in which the cuff of the endotracheal tube fits too tight. 这样的声门下溃疡是可由长期的气管内插管造成的，往往见于插管过紧。
Possitive Pressure of mechanical ventilation may impede the movement of villi, Intubation may obstruct the secretions from coughing out. 正压机械通气妨碍纤毛运动，气管内插管阻止痰液的排出。
