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Study compares narrow band imaging to chromoendoscopy for the detection of dysplasia in IBD patients
Date:10/12/2011

re processed and stained by using standard methods and were subsequently evaluated by an experienced gastrointestinal pathologist.

Results

Chromoendoscopy identified 208 suspicious lesions and 12 dysplastic lesions, while NBI detected 136 suspicious lesions and 10 dysplastic lesions. Therefore, CE identified 50 percent more "suspicious" lesions, for a 20 percent incremental yield. The prevalence of dysplastic lesions among patients enrolled in the study was 21.7 percent. The percentage of missed neoplastic lesions was higher with NBI than with CE (31.8 percent vs. 13.6 percent), resulting in a miss rate risk difference of 18.2 percent. Mean withdrawal time of the endoscope for CE was significantly longer than that for NBI (26.87 minutes vs. 15.74 minutes).

The researchers concluded that NBI appears to be a less time-consuming and an equally effective alternative to CE for the detection of neoplasia, but with a higher miss rate, and so NBI cannot be recommended as the standard technique. As a consequence, they believe that CE should still be considered the technique of choice for detecting dysplasia in patients with long-standing IBD.

In an accompanying editorial, Charles N. Bernstein, MD, Department of Internal Medicine and IBD Clinical Research Centre, University of Manitoba, Winnipeg, Manitoba, Canada, stated, "Pellise et al found a high rate of 22 percent of patients having dysplastic lesions, further promoting the value of color contrast endoscopy in searching for dysplasia, at least in the hands of an expert center prepared to biopsy up to 6 raised lesions per case. Contrary to the actual study conclusions, it seems to show a comparable merit of NBI to chromoendoscopy and a greater time efficiency. More studies of NBI in dysplasia surveillance in inflammatory bowel disease may clarify its role. However, even simpler than NBI might be white-light endoscopy with high-definition colonoscopes. For an incremental yield of findi
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Contact: Anne Brownsey
abrownsey@asge.org
630-570-5635
American Society for Gastrointestinal Endoscopy
Source:Eurekalert

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