肺部感染是基层医院常见病之一,是导致呼吸衰竭的常见病因。近年肺部感染发病率有所增加,其发病率和病死率的原因与社会人口老龄化、吸烟、伴有基础疾病和免疫功能低下有关,如慢性阻塞性肺疾病、心力衰竭、肺癌、糖尿病、艾滋病等[1]。我们对2007年3月—2009年11月住院的肺部感 Pulmonary infection is one of the common diseases in primary hospitals and is a common cause of respiratory failure. In recent years, the incidence of pulmonary infection has increased, and its morbidity and mortality causes and social population aging, smoking, associated with underlying diseases and immune dysfunction, such as chronic obstructive pulmonary disease, heart failure, lung cancer, diabetes, AIDS and other [1]. We have a sense of lung cancer from March 2007 to November 2009