为评估接受结肠镜检查病人的低钠血症发生率和血清精氨酸血管加压素的病理生理作用,研究者对40例(女14例,男26例,平均年龄57.4岁)作选择性结肠镜检查的病人进行了研究(研究组)。镜检前1天病人服用番泻叶苷B150mg,饮水3L;翌晨病人可自选饮水或果茶,并服用含聚乙烯乙二醇和平衡盐的肠道准备液2～3L清洁肠道。在病人服用肠道准备液前、结肠镜检查前后及休息1h后分别采集静 To assess the incidence of hyponatremia and the pathophysiology of serum arginine vasopressin in patients undergoing colonoscopy, the researchers selected 40 patients (14 females, 26 males, mean age 57.4 years) Colonoscopy patients were studied (study group). One day before microscopy, patients taking senna B150mg, drinking 3L; the next morning the patient can choose drinking water or fruit tea, and take balanced solution of polyethylene glycol and bowel preparation 2 ~ 3L clean the intestine. Pretreatment in patients taking intestinal preparation, before and after colonoscopy and rest after 1h were collected static