Minimal water exchange by the air–water valve versus left colon water exchange in unsedated colonoscopy: a randomized controlled trial

Authors: Cenqin Liu, Shuhao Zheng, Hui Gao, Xin Yuan, Zhixin Zhang, Jiarong Xie, Chaohui Yu, Lei Xu

Published: 2022-08-23

DOI: 10.1055/a-1929-4552

Source: Full article

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Abstract

Background Water exchange colonoscopy is the least painful method for unsedated colonoscopies. Simplified left colon water exchange (LWE) reduces the cecal intubation time but it is difficult to avoid the use of an additional pump. Minimal water exchange (MWE) is an improved novel method that eliminates the need for pumps, but it is not clear whether MWE has the same efficiency as LWE.