Minimal Water Exchange Versus Left Water Exchange in Unsedated Colonoscopy

Minimal Water Exchange Versus Left Water Exchange in Unsedated Colonoscopy: a Randomized Controlled Trial.

Minimal water exchange colonoscopy is theoretically more convenient and faster than water exchange colonoscopy. But few studies compared the differences between the two methods. Therefore, we attempted to evaluate the effect of minimal water exchange colonoscopy prospectively.

Inclusion Criteria:

• Patients aged 18 to 75 years for unsedated colonoscopy for colorectal cancer screening, polyp surveillance, or polyp resection were enrolled.

Exclusion Criteria:

• Patients who underwent sedation or analgesia before colonoscopy, and were reluctant to cooperate or provide informed consent. Those who were suffering from too serious diseases to tolerate the examination. The intestinal segment was incomplete or the colonoscopy did not reach the cecum.