医院内肺炎是第二大常见的医院内获得性感染性疾病,在重症监护病房病人中最为常见,其死亡率位居所有医院内感染之首。通气相关性肺炎(VAP)是主要发生在重症监护病房内的一类医院内肺炎。目前,VAP还没有完全可靠的诊断标准。其临床表现、放射学、微生物学和组织观察结果还没有定论。此外,VAP的高死亡 Pneumonia in hospitals is the second most common hospital acquired infectious disease, most commonly seen in intensive care unit patients, with the highest mortality rate among all hospital-acquired infections. Ventilator-associated pneumonia (VAP) is a type of nosocomial pneumonia that occurs mainly in the intensive care unit. Currently, VAP does not have a fully reliable diagnostic criteria. Its clinical manifestations, radiology, microbiology and histological findings have not yet been conclusive. In addition, the high death of VAP