【摘要】 引起老年人下消化道出血的常见病因依次为大肠癌（７７例），大肠息肉（７３例），结肠炎症（６６例），痔核等肛周病变（５５例），结肠动静脉畸形（１４例），溃疡性结肠炎等病变（４５例）。未发现病变者（６４例）。３１例大肠癌发生在横结肠至盲肠，提示老年人右半结肠癌并非少见。１９例大肠癌系由腺瘤性息肉恶变所致。５１例大肠息肉及２３例多发性息肉发生在左半结肠，提示老年人息肉或多发性息肉仍以左半结肠多见。为防止息肉恶变，对老年人大肠息肉应尽早行电凝切除术。结肠镜未能发现病因的６４例中，１５例出血系空、回肠病变所致。更多还原

【Abstract】 It was observed that the causes of lower digestive tract hemorrhage in the elderlys were,successively, colorectal carcinomas(77 cases), colorectal polyps(73 cases),colorectal inflammatory lesions(66 cases), piles and peri-anal lesions(55 cases), malformations of colorectal arteries and veins(14 cases),other colorectal diseases(45 cases). In 64 elderlys,there were no lesions found with endoscopy. Colonic carcinomas in 31 cases were found from transverse colons to cecums,which suggests that carcinomas of right colons are not rare. Carcinomas in 19 cases resulted from malignant changes of adenomatous polyps. Colorectal polyps in 51 cases and multiple polyps in 23 cases were found in left colorectum,which suggest that more colorectal polyps or multiple polyps are in left colorectum. To prevent benign polyps from malignant changes,it is suggested that electronic coagulating polypectomy of colorectal polyps should be carried out in the elderlys. In the 64 cases without lesions found with endoscopy,15 cases were found later caused by lesions in jejunum or ileum.更多还原