在重症监护病房中,肺部感染是最常见的继发感染之一,发生率约为64.7％。在老年患者中更为多见并成为死亡的主要原因之一。因此正确及时选用有效抗生素对患者预后有很重要的影响,我院中心ICU在1996年2月～1999年4月对74例老年肺部 Pulmonary infection is one of the most common secondary infections in intensive care units, with a rate of about 64.7%. It is more common among elderly patients and is one of the major causes of death. Therefore, the correct and timely selection of effective antibiotics has a very important impact on the prognosis of patients, our hospital center ICU in February 1996 ~ April 1999 on 74 cases of elderly lung