院内获得性肺炎(CAP)是最常见的肺部感染,住院病人的死亡率在6.7％～18％之间。作者前瞻性研究一组CAP病人,旨在分析病原学变化、评价BTS修改的重症肺炎标准的敏感性和特异性。 1992—07～1993—07按BTS标准住院的CAP病人,住院时照胸片并做有关检查。肺炎系指急性发病、胸片示肺段或肺叶阴影,且不易用其他疾病解释。重症肺炎按BTS修改的标准评价,住院时存在 Hospital acquired pneumonia (CAP) is the most common lung infection, with in-patient mortality rates ranging from 6.7% to 18%. The authors prospectively studied a panel of CAP patients with the aim of analyzing etiological changes and evaluating the sensitivity and specificity of BTS-modified criteria for severe pneumonia. 1992-07 ~ 1993-07 According to BTS standard hospitalized patients with CAP, according to chest radiography and do the relevant checks. Pneumonia is an acute disease, chest X-ray or lobular lung shadow, and not easy to explain with other diseases. Critically accustomed to pneumonia according to BTS modified criteria, there are hospitalizations