Clinical Trial: Adenoma Detection Rate With Position Change at Colonoscopy
Study Status: Completed
Recruit Status: Completed
Study Type: Interventional
Official Title: Evaluation of the Effect of Position Change During the Withdrawal Phase of Colonoscopy on Adenoma Detection Rate
Brief Summary:
The hypothesis to be tested is that position changes during the withdrawal phase of colonoscopy leads to a higher adenoma (polyp) detection rate because of better distension of the colon. Since adenomas are precancerous lesions the enhanced adenoma detection will increase the success of colorectal cancer screening programmes. This study will provide evidence for the value of position changes and encourage endoscopist to adopt position change as a routine in their practice.
May 2007: protocol amendment to include additional prospective analysis using High Definition TV (HDTV).
Detailed Summary:
Colorectal cancer is the second commonest cause of cancer death. In a majority of cases it is preceded by a precancerous lesion called an adenoma (commonly known as polyp). Detection and removal of adenomas at colonoscopy has been shown to reduce mortality from colorectal cancer. The success of the impending colorectal cancer screening programme to reduce cancer mortality in an average-risk population depends on optimal adenoma detection at colonoscopy. The detection of adenomas has been shown to vary between different endoscopist. Some of the factors that have been reported to affect adenoma detection rates included the time spent viewing, the adequacy of the bowel preparation and the time spent cleaning the colonic mucosa of excess fluid. Careful examination of proximal side of flexures, folds and valves by the endoscopist is equally important. However, even with careful examination adenoma detection rates have been shown to vary between endoscopist from 8.6% to 15.9%. Previous experience and training may be contributed to this difference. Some endoscopist adopt regular changes in position during the procedure to maximize distension of the colon. Better luminal distension enhances mucosal views for detection of the smaller adenomas. The validity of this approach has never been tested and we propose that this factor may contribute to the differences in adenoma detection rates.
Patients will be randomised to either position 1 first then position 2 or vice versa and examined twice. During one withdrawal the colon will be examined with the participant in the left lateral position only (position 1) or with position changes (position 2)or vice versa.
May 2007: protocol amendment to include additional prospective analysis using High Definition TV (HDTV). No further patient data collection involved.
Sponsor: London North West Healthcare NHS Trust
Current Primary Outcome: adenoma detection rate for position 1 compared to position 2
Original Primary Outcome: Same as current
Current Secondary Outcome: percentage of adenomas detected in all the participants for each position
Original Secondary Outcome: Same as current
Information By: London North West Healthcare NHS Trust
Dates:
Date Received: October 5, 2005
Date Started: October 2005
Date Completion:
Last Updated: April 1, 2009
Last Verified: December 2008
