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Digestive Diseases and Sciences

, Volume 63, Issue 12, pp 3457–3464 | Cite as

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

  • Naohisa YoshidaEmail author
  • Ken Inoue
  • Ritsu Yasuda
  • Ryohei Hirose
  • Osamu Dohi
  • Yuji Naito
  • Takaaki Murakami
  • Yutaka Inada
  • Kiyoshi Ogiso
  • Yukiko Morinaga
  • Mitsuo Kishimoto
  • Rafiz Abdul Rani
  • Yoshito Itoh
Original Article

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.

Keywords

Narrow-band imaging Colorectal polyp Polyp detection Colonoscopy Polyp miss 

Notes

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.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

Video 1

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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Naohisa Yoshida
    • 1
    Email author
  • Ken Inoue
    • 1
  • Ritsu Yasuda
    • 1
  • Ryohei Hirose
    • 1
  • Osamu Dohi
    • 1
  • Yuji Naito
    • 1
  • Takaaki Murakami
    • 2
  • Yutaka Inada
    • 3
  • Kiyoshi Ogiso
    • 4
  • Yukiko Morinaga
    • 5
  • Mitsuo Kishimoto
    • 5
  • Rafiz Abdul Rani
    • 6
  • Yoshito Itoh
    • 1
  1. 1.Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical ScienceKyoto Prefectural University of MedicineKyotoJapan
  2. 2.Department of GastroenterologyJCHO Kyoto Kuramaguchi Medical CenterKyotoJapan
  3. 3.Department of GastroenterologyFukuchiyama City HospitalKyotoJapan
  4. 4.Department of GastroenterologyOsaka General Hospital of West Japan Railway CompanyOsakaJapan
  5. 5.Department of Surgical Pathology, Graduate School of Medical ScienceKyoto Prefectural University of MedicineKyotoJapan
  6. 6.Gastroenterology Unit, Faculty of MedicineUniversiti Teknologi MARASelangorMalaysia

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