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An Additional 30-s Observation of the Right-Sided Colon with Narrow Band Imaging Decreases Missed Polyps: A Pilot Study

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Abstract

Introduction

Previous narrow-band imaging (NBI) was dark and reported not to be useful for polyp detection. In this study, we analyzed the efficacy of an additional 30-s observation of the right-sided colon with the recent bright high-resolution NBI.

Methods

We enrolled patients undergoing colonoscopy from February 2015 to May 2017 in two institutions. All procedures were performed with the latest system (EVIS LUCERA ELITE, Olympus). The cecum and ascending colon were first observed with white light imaging (WLI) in both the NBI and WLI group. Then, the colonoscope was re-inserted, and the cecum and ascending colon were observed for an additional 30 s. In this second observation, NBI was performed for the first 130 patients in the NBI group and WLI for the next 130 in the WLI group. The number of adenoma and sessile serrated polyps (ASPs) in the second observation were examined in both groups. According to our initial pilot study, the sample size was estimated at 126.

Results

In the first observation, the number of ASPs was 72 in the NBI group and 72 in the WLI group (p = 1.0). In the second observation, the number of ASPs was 23 in the NBI group and 10 in the WLI group (p = 0.02). The polyp and adenoma detection rates in the second observation were 16.2% and 12.3% in the NBI group and 7.7% (p = 0.03) and 6.2% (p = 0.09) in the WLI group.

Conclusions

The additional 30-s observation with recent NBI decreased missed polyps in the right-sided colon.

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Acknowledgments

We thank all the members of the Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, for their assistance with this study.

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Authors and Affiliations

  1. Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan

    Naohisa Yoshida, Ken Inoue, Ritsu Yasuda, Ryohei Hirose, Osamu Dohi, Yuji Naito & Yoshito Itoh

  2. Department of Gastroenterology, JCHO Kyoto Kuramaguchi Medical Center, Kyoto, Japan

    Takaaki Murakami

  3. Department of Gastroenterology, Fukuchiyama City Hospital, Kyoto, Japan

    Yutaka Inada

  4. Department of Gastroenterology, Osaka General Hospital of West Japan Railway Company, Osaka, Japan

    Kiyoshi Ogiso

  5. Department of Surgical Pathology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan

    Yukiko Morinaga & Mitsuo Kishimoto

  6. Gastroenterology Unit, Faculty of Medicine, Universiti Teknologi MARA, Selangor, Malaysia

    Rafiz Abdul Rani

Authors
  1. Naohisa Yoshida
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  2. Ken Inoue
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  3. Ritsu Yasuda
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  4. Ryohei Hirose
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  13. Yoshito Itoh
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Corresponding author

Correspondence to Naohisa Yoshida.

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Electronic supplementary material

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First WLI observation could not detect any polyps. Additional 30-s observation of the right-sided colon with NBI could detect a polyp 3 mm in size in the ascending colon. Histology showed SSP. (MP4 24169 kb)

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Yoshida, N., Inoue, K., Yasuda, R. et al. An Additional 30-s Observation of the Right-Sided Colon with Narrow Band Imaging Decreases Missed Polyps: A Pilot Study. Dig Dis Sci 63, 3457–3464 (2018). https://doi.org/10.1007/s10620-018-5275-1

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  • DOI: https://doi.org/10.1007/s10620-018-5275-1

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