【摘要】 目的 了解住院时间超长病例院内感染情况，为降低院内感染率、合理用药提供科学依据。方法 对2004年204份住院时间超长病例进行调查统计分析。结果 本组院内感染48例(65例次)，感染率23.53%,其中47例使用过抗生素，41例(52例次)抗生素使用不合理，占本组院内感染的85.42%。抗生素使用率91.18%，联合使用率 61.27%，疗程>21天占62.90%。结论 抗生素使用不合理为住院时间超长病例院内感染的重要原因。

     【关键词】 住院时间超长病例； 院内感染； 合理用药

    【Abstract】 Objective Understanding the situation of the nosocomial infectious patients of overlengthy case in hospital stays , to provide scientific base for reducing infection rate and using properly drugs .Methods Make an investigation statistics and analysis of the 204 cases which in hospital very long.Results There are 48 nosocomial infection cases in this group (64). Infection rate is 23.53%, in which 47 cases have used the antibiotic and 41 cases (152) have used the antibiotic unreasonable, which make up 85.42% of the nosocomial infection in this group. The rate of utilization is 91.18%; The rate of combined utilization utilization is 61.27%, and the course of treatment whose period is more than 21 days account for 62.90%.Conclusion Unreasonable application of antibiotic is the highest reason for the nosocomial infection of overlengthy case in hospital stays. ......