下消化道大出血系指在短时间内一次或反复多次解鲜红或暗红色血便而导致血流动力学变化 ,常需输血、输液或紧急手术 ,药物治疗有时难以奏效。本病虽远不如上消化道大出血常见 ,但临床常难以确定其出血原因与部位。我院于 1994年10月～ 1999年 6月急诊结肠镜检查 2 0例 ,其中在? Lower gastrointestinal hemorrhage refers to a single solution in a short time or repeated multiple red or dark red bloody stool and lead to hemodynamic changes, often requiring blood transfusions, infusion or emergency surgery, drug treatment sometimes difficult to work. Although the disease is far less common upper gastrointestinal bleeding, but it is often difficult to determine the clinical causes and sites of bleeding. Our hospital in October 1994 ~ June 1999 emergency colonoscopy 20 cases, of which?