下消化道出血指 Treitz 氏韧带以下肠管内出血。可来自小肠、大肠和直肠。临床表现为急性大量出血、显性出血或隐匿性出血。由于血管病变引起的下消化道出血,仅占出血原因的0.5%左右。肠系膜血管栓塞由于栓子脱落,可以伴有下消化道出血,但一般归结急腹症范畴。本文仅就血管病变致下消化道出血综述如下。一、肛管直肠静脉曲张 Lower GI bleeding refers to bleeding within the intestine following Treitz’s ligament. It can come from the small intestine, large intestine and rectum. Clinical manifestations of acute massive bleeding, dominant bleeding or occult bleeding. Due to vascular lesions caused by lower gastrointestinal bleeding, bleeding accounted for only about 0.5% of the causes. Mesenteric embolism due to emboli off, can be associated with lower gastrointestinal bleeding, but generally fall into the category of acute abdomen. This article only on the lower gastrointestinal bleeding caused by vascular disease are summarized below. First, the anorectal varicose veins