近年来 ,呼吸机作为呼吸衰竭的抢救措施之一已在临床上广泛应用[1] 。在呼吸机使用过程中因呼吸机使用不当所致的肺炎 ,称为呼吸机相关性肺炎 (ventilatorassociatedpneumo nia,VAP)。VAP是机械通气患者的常见并发症和重要致死原因 ,这一问题越来越引起医生的关注。我院 3年来 In recent years, respirator as one of the rescue measures of respiratory failure has been widely used in clinical [1]. In the use of ventilator due to improper use of ventilator pneumonia, known as ventilator-associated pneumonia (ventilatorassociatedpneumo nia (VAP). VAP is a common complication and an important cause of death in patients with mechanical ventilation, a problem that attracts more and more doctors’ attention. 3 years in our hospital