呼吸机相关性肺炎（VAP）是应用机械通气最常见的井发症，已成为院内感染性肺炎最主要的病因。1临床资料1．1一般资料我院自1993年12月至1996年9月期间应用人工机械通气病人174例，应用时间最短为1天，最长为3周，平均6．9±2．1天，发生呼吸机相关性肺炎36例，发生率达20．9％ Ventilator-associated pneumonia (VAP) is the most common form of mechanical ventilation ventilation, has become the most important cause of nosocomial pneumonia. 1 Clinical data 1.1 General Information Our hospital from December 1993 to September 1996 174 cases of artificial ventilation patients, the shortest application time of 1 day, up to 3 weeks, an average of 6.9 ± 2.1 Day, ventilator-associated pneumonia occurred in 36 cases, the incidence rate of 20.9%