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 21 November 2017

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170° wide-angle colonoscope: efficiency and miss rates

The use of the wide-angle colonoscope was associated with a reduction in insertion time to the cecum, as well as examination time during withdrawal, reports the latest issue of The American Journal of Gastroenterology, however, no evidence was found that the accuracy of the two colonoscopes differs.

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Dr Deenadayalu and colleagues from Indiana, America undertook a study in order to compare endoscopic efficiency and polyp miss rate between a prototype 170° wide-angle (WA) colonoscope and a standard (S) colonoscope.

The research team included 50 patients in the trial, performing 2 consecutive same-day colonoscopies on those participants with intact colons.

The researchers randomly selected patients to undergo the first colonoscopy with either the prototype WA 170° angle of view colonoscope or an S adult 140° angle of view colonoscope.

The research team noted that the mean time for insertion was 2.09 min and 2.5 min for the WA colonoscope and the S colonoscope, respectively.

Miss rate for all polyps with the WA colonoscope was similar to the miss rate with the S colonoscope (19% vs 27%)
The American Journal of Gastroenterology

Similarly, the researchers found that the mean time for examination during withdrawal was shorter with the WA colonoscope (4.98 vs 5.74 min).

The mean insertion time for the second examination was shorter than the insertion time for the first examination, irrespective of the colonoscope.

However, the research group found that withdrawal times were not significantly different between the first and second examinations.

The miss rate for all polyps with the WA colonoscope (19%) was found to be similar to the miss rate with the S colonoscope (27%).

In addition, the group noted that the miss rates for adenomas with the WA (30.3%) and the S scope (30%) were similar.

Dr Deenadyalu concluded, "The use of the WA colonoscope was associated with a reduction in insertion time to the cecum, as well as examination time during withdrawal."

"No evidence was found that the accuracy of the two colonoscopes differs."

The American Journal of Gastroenterology; 2004: 99 (11): 2138
23 November 2004

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