Abstract
BACKGROUND AND AIM: Data regarding the comparison of colonoscopic preparation regimens are still variable. We aimed to assess the adequacy and tolerability of two bowel preparation regimens for afternoon colonoscopy. METHODS: In a randomized, investigator-blinded trial, two preparation regimens [4-L split-dose polyethylene glycol-electrolytes (PEG-ELS) and 2-L PEG-ELS plus bisacodyl) were compared in terms of bowel cleansing efficacy and adverse effects. RESULTS: The mean (±SD) age (years) of the 4-L split-dose PEG-ELS group (N = 147) and the 2-L PEG-ELS plus bisacodyl (N = 155) were 44.09 (±15.62) (M:F : 2:1) and 44.12 years (±15.61) (M:F : 1.7:1), respectively. Percentage of patients with excellent and good preparation was higher in the 4-L split-dose PEG-ELS regimen compared with the 2-L PEG-ELS plus bisacodyl regimen (22.44 vs 17.41 and 44.21% vs 36.12%). Percentage of patients with fair and poor preparation was lower in 4-L split-dose PEG-ELS regimen compared with the 2-L PEG-ELS plus bisacodyl regimen (21.08% vs 27.74% and 12.24% vs 18.70%). In comparison with the 2-L PEG-ELS plus bisacodyl group, the incidences of abdominal pain (11% vs 15%), bloating (9% vs 12.24%), nausea/vomiting (8.38% vs 9.52%), and sleep disturbance (11% vs 12%) were slightly more common in the 4-L split-dose PEG-ELS group. There were no statistically significant differences between the two regimens with regard to bowel cleansing efficacy and adverse events. CONCLUSIONS: The 2-L PEG-ELS plus bisacodyl (10 mg) preparation is as efficacious as the 4-L split-dose PEG-ELS regimen for afternoon colonoscopy. Optimal preparation for colonoscopy can be achieved with the 2-L PEG-ELS plus bisacodyl regimen with slightly fewer adverse events and lower cost compared to the 4-L split-dose PEG-ELS regimen.