Comparison Between 3-L and 4-L Polyethylene Glycol in Bowel Preparation

Comparison of the Efficacy and Tolerability Between 3-L and 4-L Polyethylene Glycol in Bowel Preparation

High quality bowel preparation is essential for successful colonoscopy. This study aimed to assess the impact of the dose of Polyethylene Glycol(PEG) on the quality of bowel preparation. This prospective, endoscopist-blinded, randomized, controlled study was conducted. 3L-group received 3 bags of PEG and were instructed to drink 1L at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes, and to drink the remaining 2L 4 to 6 h before colonoscopy at the same rate. 4L-group received 4bags of PEG and were instructed to drink 2 L at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes, and to drink the remaining 2L 4 to 6 h before colonoscopy at the same rate. The primary outcome was the quality of the bowel preparation according to the Boston Bowel Preparation Scale (BBPS). The secondary outcomes included polyp detection rate (PDR), adenoma detection rate (ADR), tolerance, and subjective feelings of patients.

4L-group received 4 bags of PEG and were instructed to drink 2L at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes, and to drink the remaining 2L 4 to 6 h before colonoscopy at the same rate.

3L-group received 3 bags of PEG and were instructed to drink 1L at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes, and to drink the remaining 2L 4 to 6 h before colonoscopy at the same rate.

4L group received double-dose PEG at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes.

3L group were instructed to drink 1L PEG at 19:00 in the evening before the day of colonoscopy at a rate of 250 mL every 15 minutes

The primary end point of the study was adequate bowel preparation quality de ned as a BBPS total score of ≥6 with all segment scores ≥2

Inclusion Criteria: Outpatients aged 18-75 years Referred for routine diagnostic colonoscopy Patients who have signed inform consent form Exclusion Criteria: pregnancy or breastfeeding allergy to purgatives suspected intestinal obstruction, stricture, or perforation hemodynamic instability impaired swallowing reflex or mental status severely medical status, such as New York Heart Association grade III or grade IV congestive heart failure and severe renal failure history of oesophagus、stomach 、duodenum、small intestine or colorectal surgery participation declined.

Cheng P, Chen Q, Li J, Pang L, Feng C, Wang N, Bai Y, Li Z, Meng X. 3 liters of polyethylene glycol vs. standard bowel preparation have equal efficacy in a Chinese population: a randomized, controlled trial. Am J Transl Res. 2022 Aug 15;14(8):5641-5650. eCollection 2022.