Water method with water exchange has been shown to reduce medication requirement and pain experienced during colonoscopy. It increases the success rate of cecal intubation in sedated and unsedated patients undergoing screening colonoscopy. Exchange of water during scope insertion minimizes distension of the colonic lumen and decreases loop formation. Exclusion of air from the colon during insertion by omission of air insufflations and suction removal of residual air prevent elongation of the colon. These maneuvers facilitate colonoscopy insertion in average patients and may enhance the success of difficult colonoscopy. Female gender and low-body mass index (BMI) is independently associated with incomplete colonoscopy, respectively. The investigators postulate that low-BMI female patients may benefit from using the water method for colonoscopy. In this proposal the investigators test the hypothesis that compared with conventional air insufflations the water method with water exchange significantly enhances the success rate of cecal intubation in low-BMI female patients. The aim of the study is to compare the outcome of colonoscopy using the water method versus the conventional air method in low-BMI female patients. The primary outcome is cecal intubation success rate. The secondary outcomes include cecal intubation time, maximum pain score during colonoscopy, overall pain score after colonoscopy and adenoma detection rate.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SCREENING
Masking
SINGLE
Colonoscopy will be performed without medications and aided by water infusion in-lieu of air insufflation during insertion of the colonoscope. The water infusion involves putting warm sterile water into the colon to open up the colon for advancement of the colonoscope until the end of the colon (cecum) is reached. The water is delivered through scope irrigation channel by an infusion pump equipped with a foot switch which will be controlled by the endoscopist. Infused water used to cleanse residual fecal matter will be suctioned as needed to clear the colonic lumen.
Endoscopic center, Xijing Hospital of Digestive Diseases
Xi'an, Shaanxi, China
Cecal intubation success rate
Insertion of a colonoscope to the cecum
Time frame: up to two years
Adenoma detection rate
The proportion of participants with at least one adenoma in each group
Time frame: up to two years
Pain Scores on the Visual Analog Scale
0 = no pain, to 10 = most severe pain
Time frame: up to two years
Cecum intubation time
Total time of colonoscope intubation from anus to cecum
Time frame: up to two years
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