一、下消化道出血的概念临床上一般将十二指肠悬韧带以下的消化道称为下消化道,主要包括空回肠、结直肠和肛门。通常将来源于十二指肠悬韧带以下的消化道出血称为下消化道出血,一般是在通过胃管抽吸或胃镜检查等排除了上消化道出血后方诊断为下消化道出血的。临床上以便血为主要表现,色鲜红、暗红或呈柏油样,便血的颜色取决于消化道出血的部位、出血量与血液在肠道停留的时间。出血部位越 First, the concept of lower gastrointestinal bleeding Clinical generally lower gastrointestinal duodenal suspensa ligament as the lower gastrointestinal tract, including the ileum, colorectal and anus. Gastrointestinal hemorrhage, which usually originates below the duodenal suspensory ligament, is usually referred to as lower gastrointestinal bleeding, which is usually diagnosed as lower gastrointestinal bleeding after gastric bleeding or gastroscopy is excluded. Clinically, blood is the main manifestation of red, dark red or asphalted, the color of blood in the stool depends on the site of gastrointestinal bleeding, blood loss and blood in the intestine stay time. Bleeding site more