Study Compares Narrow Band to White Light Colonoscopy

Results equal when performed by single skilled examiner

TUESDAY, July 24 (HealthDay News) -- There is no significant difference between white light colonoscopy and narrow band imaging when it comes to detecting adenomas if the examinations are performed by a single skilled endoscopist, researchers report in the July issue of Gastroenterology.

A previous study suggested that narrow band imaging doubled the number of detected adenomas. In the new study, Douglas K. Rex, M.D., of the Indiana University School of Medicine in Indianapolis, and a colleague had an endoscopist examine 434 patients (231 males; mean age 62) with no previous colorectal cancer or colon resections. The endoscopist used high-definition, wide-angle colonoscopes (prototype Olympus 180 series) with both white light and narrow band imaging options, to examine patients.

The percentage of patients with one or more adenomas was 67 percent in the white light examinations versus 65 percent in the narrow band imaging examinations. The overall rate of detection for the white light arm of the study was 1.8 adenomas per colonoscopy versus 1.9 with narrow band imaging. The majority of the detected adenomas were 5 mm or smaller. The rate of flat adenomas detected per colonoscopy was 1.0 for both techniques.

The authors note that the number of adenomas detected in these exams exceed those detected in any previous study, a result they attribute to the use of high-definition imaging. "Narrow band imaging did not result in better detection of adenomas by an endoscopist with a known high detection rate using white light," they conclude. "This result does not exclude a possible benefit of narrow band imaging in reducing variation between endoscopists in detection of adenomas."

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