Study compares colonoscopy polyp detection rates and endoscopist characteristics
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Study compares colonoscopy polyp detection rates and endoscopist characteristics

Press releases may be edited for formatting or style | April 18, 2019 Endoscopy
Wednesday, April 17, 2019, CLEVELAND: Previous research has suggested that specific factors about the doctor performing colonoscopy - for example, a gastroenterologist versus a surgeon, female versus male - were associated with different rates of detection of precancerous polyps.

However, a Cleveland Clinic-led research team found that those previously described differences among endoscopists are not true.

Adjusting for a myriad of both patient- and doctor-related factors not previously accounted for, Cleveland Clinic researchers concluded that the previously cited differences disappeared in adenoma detection based on the endoscopist features - except when it comes to the detection of sessile serrated polyps, which are difficult to detect and a known precursor of colorectal cancer.

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The study data - published in JAMA Surgery - showed that lower sessile serrated polyp detection was only associated with endoscopists who had a lower annual volume of colonoscopies and longer years since completion of medical training.

A colonoscopy is a common endoscopic procedure, with more than 14 million examinations performed in the U.S. annually. The efficacy of a colonoscopy to prevent colorectal cancer depends on the quality of the endoscopist to detect and remove lesions that can turn into cancer, such as adenomas and sessile serrated polyps.

"There are national benchmarks that define a high-quality endoscopist. Asking your endoscopist about their personal colonoscopy quality metrics can empower patients to make informed choices about their colonoscopy provider," said Carol Burke, M.D., vice chair of the Department of Gastroenterology, Hepatology & Nutrition at Cleveland Clinic and senior author of the study.

Cleveland Clinic's research team conducted a large, single-center retrospective study that analyzed data from 16,089 average-risk, screening colonoscopies performed by 56 providers (gastroenterologists, 60.7 percent; surgeons, 26.5 percent; advanced endoscopists, 12.5 percent) between January 2015 and June 2017. Twenty-five percent of endoscopists were female and 25 percent were international medical graduates. The providers' median time from training was 16.3 years and they performed a median of 267 colonoscopies per year.

Provider characteristics considered in the study included endoscopist specialty, gender, location of medical school, years since fellowship, number of colonoscopies performed per year, practice setting and presence of trainee during colonoscopy. The analysis also accounted for numerous patient characteristics not considered in some studies, including age, gender, smoking status, comorbidities such as diabetes and coronary artery disease, medication use, and colonoscopy-related factors, including timing of procedure (month and time of day), location where colonoscopy was performed, cecal intubation rate, number of polyps found, quality of bowel preparation and withdrawal time.

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