院内下呼吸道感染是最常见的院内感染,ＩＣＵ病人往往病情危重,均使用大剂量的广谱抗生素,其院内下呼吸道感染发生率和病死率有逐渐上升的趋势,已引起医学界的关注。本文对我院ＩＣＵ病房1994年4月至1998年12月期间的142例危重病人下呼吸道分离的180株细菌进行分类及耐药性分析 Nosocomial lower respiratory tract infection is the most common nosocomial infection. ICU patients are often in critical condition. All of them use large doses of broad-spectrum antibiotics. The incidence and mortality of lower respiratory tract infections in hospitals have gradually risen, which has drawn the attention of the medical community. In this paper, we classified 180 strains of bacteria isolated from the lower respiratory tract of 142 critically ill patients in ICU ward of our hospital from April 1994 to December 1998 and analyzed the drug resistance