Usefulness of a colonoscopy cap with an external grid for the measurement of small‐sized colorectal polyps: A prospective randomized trial

Seul Ki Han, Hyunil Kim, Jin Woo Kim, Hyun Soo Kim, Su Yong Kim, Hong Jun Park

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Accurate measurement of polyp size during colonoscopy is crucial. The usefulness of cap-assisted colonoscopy and external grid application on monitor (gCAP) was evaluated for polyp size measurement in this 3‐year, single‐center, single‐blind, randomized trial. Using the endoscopic forceps width as reference, the discrepancy percent (DP), error rate (ER), and measurement time were compared between gCAP and visual estimation (VE) after randomization. ER was calculated within a 20% and 33% limit. From the 111 patients, 280 polyps were measured. The mean polyp sizes were 4.0 ± 1.7 mm and 4.2 ± 1.8 mm with gCAP and VE, respectively (p = 0.368). Compared with that by the forceps method, DP was significantly lower in the gCAP group than in the VE group. Moreover, ER was significantly lower in the gCAP group within its preset limit. The measurement time was 4 s longer in the gCAP group than in the VE group (8.2 ± 4.8 s vs. 4.2 ± 1.5 s; p < 0.001). However, the forceps method lasted 28 s longer than the others. On subgroup analysis by size, gCAP was more accurate for polyp size ≥5 mm. The gCAP method was more accurate for polyp size measurement than VE, especially for polyps ≥5 mm, and was more convenient than the forceps method.

Original languageEnglish
Article number2365
JournalJournal of Clinical Medicine
Volume10
Issue number11
DOIs
Publication statusPublished - 2021 Jun 1

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • General Medicine

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