Efficacy of Polyethylene Glycol Electrolyte Powder Combined with Linaclotide for Colon Cleansing in Patients with Chronic Constipation undergoing colonoscopy: a Multi-centre, single-blinded, Randomized-Controlled Trial.

BACKGROUND AND AIMS:Constipation is an independent risk factor for poor bowel preparation. This study aimed to evaluate the bowel-cleansing efficacy and safety of polyethylene glycol (PEG) combined with linaclotide (lin) for colonoscopy in patients with chronic constipation. METHODS:This single-blinded, randomized, controlled and multicenter study was conducted from July 2021 to December 2022 at seven hospitals. Patients with chronic constipation who underwent colonoscopies were enrolled and randomly assigned to 4 groups with split -PEG regimens: 4L-PEG group, 4L-PEG+1d-Lin group, 3L-PEG+1d-Lin group, and 3L-PEG+3d-Lin group. The primary outcome was rates of adequate bowel preparation, defined as a total BBPS score ≥6 and a score ≥2 for each segment. Secondary outcomes were adverse effects, sleep quality, willingness to repeat the colonoscopy, adenoma detection rate, and polyp detection rate. RESULTS:502 patients were enrolled. The rates of adequate bowel preparation (80.0% vs. 60.3%, P<0.001; 84.4% vs. 60.3%, P<0.001) and the total BBPS scores (6.90±1.28 vs. 6.00±1.61, P<0.001; 7.03±1.24 vs. 6.00±1.61, P<0.01) in 4L-PEG+1d-Lin group and 3L-PEG+3d-Lin group were superior to that in 4L-PEG group. Compared with 4L-PEG group, 4L-PEG+1d-Lin group (66.7% vs. 81.7%, P=0.008) and 3L-PEG+3d-Lin group (75.0% vs. 81.7%, P=0.224) had a lower percentage of mild adverse events. No statistically significant difference in willingness to repeat the colonoscopy, sleep quality, polyp detection rate, or adenoma detection rate was observed among groups. CONCLUSIONS:PEG combined with linaclotide might be an effective method for bowel preparation before colonoscopy in patients with chronic constipation.