Cecal intubation time between the use of one‐channel and two‐channel water exchange colonoscopy: A randomized controlled trial

Background and Aim Water exchange (WE) colonoscopy is the least painful insertion technique with high adenoma detection rate but requires a longer intubation time. In the published literature, some investigators used the instrument channel for both infusing and suctioning of water (one channel), while others use colonoscopes with an integrated water‐jet channel specifically designed for infusing water (two channel). The aim of this study was to compare cecal intubation time between one‐channel and two‐channel WE. Methods A total 120 patients undergoing colonoscopy from May 2017 to April 2019 at a regional hospital in southern Taiwan were randomized to either a two‐channel group (n = 60) or a one‐channel group (n = 60). The primary outcome was cecal intubation time. Results The mean cecal intubation time was significantly shorter in the two‐channel group compared with the one‐channel group (14.0 ± 4.0 vs 17.4 ± 6.7 min, P