近年来医院感染的发生率逐年增高,其中73.9%的医院感染为呼吸道感染[1,2]。随着社会的老龄化,老年住院患者增多,故对老年人院内获得性肺炎(HAP)的研究尤为重要。为了解老年人HAP的危险因素和病原菌,我们对我院3年中发生的2136例老年人HAP的临床资料进行回顾性分析,探讨其危险因 In recent years, the incidence of nosocomial infections has been increasing year by year, of which 73.9% of nosocomial infections are respiratory infections [1,2]. With the aging of the society, there are more elderly inpatients, so it is particularly important to study the elderly acquired nosocomial pneumonia (HAP). In order to understand the risk factors and pathogens of HAP in the elderly, we retrospectively analyzed the clinical data of 2136 HAP patients in our hospital in 3 years to investigate the risk factors