Comparison Between Asymmetric (Low Dose In The Morning) And Standard Split-Dose Regimen Of Polyethylene Glycol Plus Bisacodyl For Bowel Preparation For Screening And Surveillance Colonoscopy: A Randomized Non-Inferiority Clinical Trial.

Prospective, randomized, single-blind, non-inferiority trial in adult patients undergoing screening or surveillance colonoscopy. Eligible participants were randomly assigned, according to a computer-generated list with an allocation ratio of 1:1, to receive either asymmetric or symmetric split-dose regimen of a low-volume preparation by investigators who were not involved in the enrolment process. Detailed written instructions were administered to all patients who accepted to participate. A low-fiber diet was prescribed three day before colonoscopy; participants in both groups were instructed to have a light lunch on the day before the colonoscopy and only clear liquid were allowed on the day of the exam. All endoscopic procedures were scheduled between 9:00 AM and 1:00 PM.

The preparation used in the study is a combination of a 2 L sulphate-free iso-osmotic formulation of of PEG-4000 added with citrates and simethicone (PEG-CS) (Lovol-esse; AlfaWassermann, Bologna, Italy. Kit contains 4 pouches, each containing 64.5gr of PEG, to be dissolved in 2 L of water.), and bisacodyl 5 mg tablets (Lovodyl; Alfa-Wassermann, Bologna, Italy).

All subjects were instructed to take 4 bisacodyl tablets at 4:00 PM on the day before the procedure. Subjects allocated to the asymmetric split-dose regimen group were invited to consume at 6:00 PM on the evening before the colonoscopy 3 sachets of PEG-CS in 1,5 L of water in a range from 90 to 120 minutes (about 250 mL every 15 min) and 4 hours before the scheduled procedure 1 sachets in 0,5 L of water in a range from 15 to 30 minutes. Subjects allocated to the symmetric split-dose regimen group were invited to consume at 6:00 PM on the evening before the colonoscopy 2 sachets of PEG-CS in 1 L of water in a range from 60 to 90 minutes and 5 hours before the scheduled procedure 2 sachets in 1 L of water in a range from 60 to 90 minutes.

Unblinded investigators collected demographic and clinical data with medical history. All patients filled in a nurse-administered questionnaire to assess compliance, tolerability and safety of bowel preparation.

Blinded experencied endoscopists performed endoscopic procedure in accordance with colonoscopy quality practice. Data on bowel cleansing (evaluated by using Boston Bowel Preparation Scale), endoscopic procedures and findings (i.e. cancer, polyps, diverticula) were collected.