结肠镜检查前清肠方法分两类 ,一、口服泻药 ;能较全面彻底清洁大肠。但若急诊结肠镜检查时 ,则来不及准备肠道。而且 ,如患者全身情况差或疑有肠梗阻时 ,可能会引起电解质紊乱或加重梗阻症状。二、经肛门灌入清肠液 ;不受时间和患者身体状况限制。但对脾曲以上肠段清肠效果差 Colonoscopy before bowel method in two categories, one, oral laxative; can more thoroughly clean the large intestine. However, if the emergency colonoscopy, it is too late to prepare the intestine. Moreover, patients with poor general condition or suspected intestinal obstruction may cause electrolyte imbalance or aggravate obstructive symptoms. Second, through the anus pouring bowel fluid; not subject to the time and the patient’s physical condition. However, bowel bowel bowel bowel effect is poor