对我院 1985年 1月至 1999的 10月来自海拔 3 0 0 0ｍ以上42 0例急性上消化道出血住院患者的内镜检查资料进行分析 ,诊断出血性十二指肠炎 62例 ,发生率高于平原地区 ,有明显的地区特点 ,现就病因问题探讨如下。1　临床资料1.1　一般资料　本组病例均因上消化道出血住院患者 , In our hospital from January 1985 to October 1999 from more than 3000m above sea level in 420 cases of patients with acute upper gastrointestinal bleeding endoscopic examination data analysis of 62 cases of hemorrhagic duodenitis, the high incidence In plain areas, there are obvious regional characteristics, the cause of illness are discussed below. 1 Clinical data 1.1 General Information The patients were hospitalized patients with upper gastrointestinal bleeding,