1992年美国癌症协会提出,对无症状的一般危险人群每年作粪便隐血试验和每3～5年作乙状结肠镜检查各一次。本研究旨在确定≥50岁的一般危险人群在首次检查阴性后第二次纤维乙状结肠镜检查的收益。 材料与方法:259名在首次纤维乙状结肠镜检查阴性后≥2年的无症状者再行第二次检查,其中58％在两次检查间期有≥1次的粪便隐血试验阴性。检查前晚服用一瓶枸椽酸镁,不用镇静剂,检查当天清晨两次快速灌肠。内镜插入的平均深度在首次检查为66 cm,第二次为68 cm。 结果:受试者首次检查的平均年龄为56.4岁,两次检查的平均间隔为41个月,少数受检 In 1992, the American Cancer Society proposed that the stool occult blood test should be conducted for the asymptomatic general risk population and the sigmoidoscopy every 3 to 5 years. The aim of this study was to determine the benefit of a second fibrolarygoscopy at the age at first 50 years of age in a general at-risk population of ≥50 years. MATERIALS AND METHODS: A second examination of 259 asymptomatic patients ≥2 years after the first sigmoidoscopy was negative, of which 58% had ≥1 fecal occult blood test negative between the two examinations. Check the night before taking a bottle of magnesium citrate, without sedatives, check the morning of the morning twice quickly enema. The average depth of endoscopic insertion was 66 cm for the first check and 68 cm for the second. Results: The average age of subjects for the first examination was 56.4 years old, the average interval between two tests was 41 months, a small number of subjects