Adenoma Detection Rate With Position Change at Colonoscopy

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00234650
Recruitment Status : Completed
First Posted : October 7, 2005
Last Update Posted : April 2, 2009
Information provided by:
London North West Healthcare NHS Trust

October 5, 2005
October 7, 2005
April 2, 2009
October 2005
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adenoma detection rate for position 1 compared to position 2
Same as current
Complete list of historical versions of study NCT00234650 on Archive Site
percentage of adenomas detected in all the participants for each position
Same as current
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Adenoma Detection Rate With Position Change at Colonoscopy
Evaluation of the Effect of Position Change During the Withdrawal Phase of Colonoscopy on Adenoma Detection Rate

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).

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.

Not Applicable
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single
Primary Purpose: Diagnostic
Procedure: Colonoscopy
Not Provided
East JE, Bassett P, Arebi N, Thomas-Gibson S, Guenther T, Saunders BP. Dynamic patient position changes during colonoscope withdrawal increase adenoma detection: a randomized, crossover trial. Gastrointest Endosc. 2011 Mar;73(3):456-63. doi: 10.1016/j.gie.2010.07.046. Epub 2010 Oct 15.

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Same as current
September 2007
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Inclusion Criteria:

  • Patients referred ot colonoscopy, age between 50 - 70 years

Exclusion Criteria:

  • Patients with colorectal cancer, previous colonic surgery, active colitis and musculoskeletal problems Patients may also be excluded after the first insertion, if painful, routine care will proceed
Sexes Eligible for Study: All
50 Years to 80 Years   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United Kingdom
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London North West Healthcare NHS Trust
Not Provided
Principal Investigator: Brian Saunders, MD St Mark's Hospital, North West London NHS Trust
London North West Healthcare NHS Trust
December 2008

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP