Retrospective Study
Copyright ©The Author(s) 2022. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Hepatol. May 27, 2022; 14(5): 992-1005
Published online May 27, 2022. doi: 10.4254/wjh.v14.i5.992
Angle of covered self-expandable metallic stents after placement is a risk factor for recurrent biliary obstruction
Kojiro Tanoue, Hirotsugu Maruyama, Yuki Ishikawa-Kakiya, Yosuke Kinoshita, Kappei Hayashi, Masafumi Yamamura, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Fumio Tanaka, Noriko Kamata, Yasuaki Nagami, Koichi Taira, Toshio Watanabe, Yasuhiro Fujiwara
Kojiro Tanoue, Hirotsugu Maruyama, Yuki Ishikawa-Kakiya, Yosuke Kinoshita, Kappei Hayashi, Masafumi Yamamura, Masaki Ominami, Yuji Nadatani, Shusei Fukunaga, Koji Otani, Shuhei Hosomi, Fumio Tanaka, Noriko Kamata, Yasuaki Nagami, Koichi Taira, Toshio Watanabe, Yasuhiro Fujiwara, Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka 545-8585, Japan
Author contributions: Tanoue K and Maruyama H contributed to study conception and design; Tanoue K and Maruyama H analyzed and interpreted the data; Tanoue K, Maruyama H, Ishikawa-Kakiya Y, Kinoshita Y, Hayashi K, Yamamura M, Ominami M, Nadatani Y, Fukunaga S, Otani K, Hosomi S, Tanaka F, Kamata N, Nagami Y, Taira K, and Watanabe T wrote, reviewed, and/or revised the manuscript; Fujiwara Y supervised the study; all authors reviewed and approved the final manuscript.
Institutional review board statement: The study was reviewed and approved for publication by our institutional reviewer.
Informed consent statement: All study participants provided written informed consent for personal and medical data collection prior to study enrolment. All patients were given the opportunity to opt out of this study on our website’s homepage.
Conflict-of-interest statement: All authors declare that they have no conflict of interest to disclose.
Data sharing statement: The original anonymous dataset is available upon request from the corresponding author at hiromaruyama99@gmail.com.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Hirotsugu Maruyama, MD, PhD, Doctor, Lecturer, Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan. hiromaruyama99@gmail.com
Received: June 8, 2021
Peer-review started: June 8, 2021
First decision: August 18, 2021
Revised: September 1, 2021
Accepted: April 24, 2022
Article in press: April 24, 2022
Published online: May 27, 2022
Processing time: 349 Days and 21 Hours
Core Tip

Core Tip: We aimed to assess whether the angle of covered self-expandable metallic stents (CSEMS) after placement is a risk factor for recurrent biliary obstruction (RBO) in patients with unresectable distal malignant biliary obstruction. We included 87 patients in this study and divided them into two cohorts. We found that the angle of the CSEMS after placement was an independent risk factor for RBO. Furthermore, we demonstrated that the cut-off value of the angle of CSEMS after placement was 130° and that time to RBO in the < 130° group was significantly shorter than that in the ≥ 130° group.