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Next-generation narrow band imaging system for colonic polyp detection: a prospective multicenter randomized trial

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Purpose

Previous studies have yielded conflicting results on the colonic polyp detection rate with narrow-band imaging (NBI) compared with white-light imaging (WLI). We compared the mean number of colonic polyps detected per patient for NBI versus WLI using a next-generation NBI system (EVIS LUCERA ELITE; Olympus Medical Systems) used with standard-definition (SD) colonoscopy and wide-angle (WA) colonoscopy.

Methods

Design: this study is a 2 × 2 factorial, prospective, multicenter randomized controlled trial. Setting: this study was conducted at five academic centers in Japan. Interventions: patients were allocated to one of four groups: (1) WLI with SD colonoscopy (H260AZI), (2) NBI with SD colonoscopy (H260AZI), (3) WLI with WA colonoscopy (CF-HQ290), and (4) NBI with WA colonoscopy (CF-HQ290). Main outcome: the mean numbers of polyps detected per patient were compared between the four groups: WLI with/without WA colonoscopy and NBI with/without WA colonoscopy.

Results

Of the 454 patients recruited, 431 patients were enrolled. The total numbers of polyps detected by WLI with SD, NBI with SD, WLI with WA, and NBI with WA were 164, 176, 188, and 241, respectively. The mean number of polyps detected per patient was significantly higher in the NBI group than in the WLI group (2.01 vs 1.56; P = 0.032). The rate was not higher in the WA group than in the SD group (1.97 vs 1.61; P = 0.089).

Conclusions

Although WA colonoscopy did not improve the polyp detection, next-generation NBI colonoscopy represents a significant improvement in the detection of colonic polyps.

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Acknowledgments

We thank all investigators who cooperated in recruiting patients at the five participating centers.

Author contributions

Study concept and design: Takahiro Horimatsu, Yasushi Sano, Manabu Muto, and Hisao Tajiri; acquisition of data: Shiro Oka, Takuji Kawamura, Shoichi Saito, Mineo Iwatate, Koji Uno, Naoto Tamai, and Shinji Tanaka; analysis and interpretation of data: Hideki Ishikawa; and statistical analysis: Kenichi Yoshimura.

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Correspondence to Takahiro Horimatsu.

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Horimatsu, T., Sano, Y., Tanaka, S. et al. Next-generation narrow band imaging system for colonic polyp detection: a prospective multicenter randomized trial. Int J Colorectal Dis 30, 947–954 (2015). https://doi.org/10.1007/s00384-015-2230-x

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  • DOI: https://doi.org/10.1007/s00384-015-2230-x

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