Novel catheter-based polyp ruler accurately, easily measures polyp size
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The Napoleon, a catheter-based polyp ruler, easily and more accurately measured polyp size compared with visual measurement alone, according to a presentation at the American College of Gastroenterology Virtual Annual Scientific Meeting.
“We know polyp size is very important for determining colonoscopy surveillance intervals; in one study that looked at polyp size, they noted that 61.3% of the time polyps were overestimated by 33% or more, resulting in inappropriate surveillance recommendations 35.2% of the time,” Mark B. Pochapin, MD, FACG, division of gastroenterology at NYU Langone Health, said. “There is an unmet need for a practical tool that is accurate, cheap, easy to use, easy for trainees to learn and readily available for use during snare or forceps polypectomy. I believe the Napoleon is that device.”
In a pilot feasibility study, six physicians evaluated 23 patients for polyp and polyp size. They identified 36 polyps first measured in the usual manner followed by measurement via the Napoleon (Micro Tech Endoscopy). Endoscopists graded the Napoleon (scale of 1 to 10, 1 being the easiest) on placement and positioning, extension and retraction of the ruler component and ease of photograph acquisition.
Placement and positioning yielded a weighted score of 2.62 (95% CI, 1.83-3.41), photograph acquisition yielded a weighted score of 2.17 (95% CI, 0.45-3.88) and extension and retraction yielded a weighted score of 1.43 (95% CI, 1.02-1.85). The difference between visual and measured polyp size was 0.28 mm.
“The small pilot study demonstrated the ease and feasibility of using a small ruler to more accurately measure polyps,” Pochapin said. “Larger studies are definitely needed to evaluate if more accurately measuring polyps can either determined surveillance intervals more accurately and diminish doing surveillance colonoscopy sooner than recommended guidelines, assistant training fellows and confirm polyp size when investigating new technology.”
Pochapin M. Presentation 34. Presented at: The American College of Gastroenterology Annual Scientific Meeting (Virtual). Oct. 26-28, 2020.
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Pochapin M. Presentation 34. Presented at: The American College of Gastroenterology Annual Scientific Meeting (Virtual). Oct. 26-28, 2020.
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