Abstract:Objective?To evaluate the cleanliness and tolerance of different administration speed on polyethylene glycol electrolyte solution (PEG-ES) for colonoscopy preparation.?Methods?97 consecutive asymptomatic individuals underwent colonoscopy and therapy were enrolled and randomly assigned into 2 groups. Subjects in group A drank 2 000 ml PEG-ES (1 000 ml every 10 ~ 20 min rapidly) within 1 h before colonoscopy; Subjects in group B drank 2 000 ml PEG-ES (250 ml every 10 min) within 2 h before colonoscopy. The total time of drinking PEG-ES, the first defecation time and total numbers of defecation after drinking PEG-ES, score and degree of Boston bowel preparation scale (BBPS) and PEG-ES related adverse effects of the two groups were assessed and compared.?Results?There were no significant differences in gender, age and cecal insertion rate between group A and group B (P > 0.05). The total time of drinking PEG-ES, the first defecation time in group A were significant faster than those in group B, while total numbers of defecation was significantly more than that in group B (P < 0.05). No patients in the two groups complained PEG-ES related bellyache and vomiting, a little subjects in group B complained PEG-ES related nausea and bloating (P < 0.05), but the incidence were both less than 10.00 %. Accepting rate of colonoscopy preparation in group A was lower than that in group B, but both more than 90.00%, while accepting rate of re-colonoscopy than that in group B. BBPS score of the right half colon, transverse colon, total colon were significantly higher in group A than that in group B respectively (P < 0.05), while that of the left colon no significant differences between the two groups (P > 0.05).?Conclusions?Both regimens met the requirement of conventional colonoscopy and therapy, while rapid drinking PEG-ES within 1 h provides more better colonic cleansing quality for colonoscopy preparation.