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Short turn radius colonoscope in an anatomical model: Retroflexed withdrawal and detection of hidden polyps.
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Short turn radius colonoscope in an anatomical model: Retroflexed withdrawal and detection of hidden polyps. World journal of gastroenterology Mcgill, S. K., Kothari, S., Friedland, S., Chen, A., Park, W. G., Banerjee, S. 2015; 21 (2): 593-599Abstract
To evaluate the new RetroViewâ„¢ colonoscope and compare its ability to detect simulated polyps "hidden" behind colonic folds with that of a conventional colonoscope, utilizing anatomic colon models.Three anatomic colon models were prepared, with twelve simulated polyps "hidden" behind haustral folds and five placed in easily viewed locations in each model. Five blinded endoscopists examined two colon models in random order with the conventional or RetroViewâ„¢ colonoscope, utilizing standard withdrawal technique. The third colon model was then examined with the RetroViewâ„¢ colonoscope withdrawn initially in retroflexion and then in standard withdrawal. Polyp detection rates during standard and retroflexed withdrawal of the conventional and RetroViewâ„¢ colonoscopes were determined. Polyp detection rates for combined standard and retroflexed withdrawal (combination withdrawal) with the RetroViewâ„¢ colonoscope were also determined.For hidden polyps, retroflexed withdrawal using the RetroViewâ„¢ colonoscope detected more polyps than the conventional colonoscope in standard withdrawal (85% vs 12%, P = 0.0001). For hidden polyps, combination withdrawal with the RetroViewâ„¢ colonoscope detected more polyps than the conventional colonoscope in standard withdrawal (93% vs 12%, P = 0.0001). The RetroViewâ„¢ colonoscope in "combination withdrawal" was superior to other methods in detecting all (hidden + easily visible) polyps, with successful detection of 80 of 85 polyps (94%) compared to 28 (32%) polyps detected by the conventional colonoscope in standard withdrawal (P < 0.0001) and 67 (79%) polyps detected by the RetroViewâ„¢ colonoscope in retroflexed withdrawal alone (P < 0.01). Continuous withdrawal of the colonoscope through the colon model while retroflexed was achieved by all endoscopists. In a post-test survey, four out of five colonoscopists reported that manipulation of the colonoscope was easy or very easy.In simulated testing, the RetroViewâ„¢ colonoscope increased detection of hidden polyps. Combining standard withdrawal with retroflexed withdrawal may become the new paradigm for "complete screening colonoscopy".
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