Blood group O is a risk factor for delayed post-polypectomy bleeding
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Blood group O is a risk factor for delayed post‑polypectomy bleeding Hiroto Furuhashi1 · Akira Dobashi1 · Naoto Tamai1 · Nana Shimamoto1 · Masakuni Kobayashi1 · Shingo Ono1 · Yuko Hara1 · Hiroaki Matsui1 · Shunsuke Kamba1 · Hideka Horiuchi1 · Akio Koizumi1 · Tomohiko R. Ohya1 · Masayuki Kato1 · Keiichi Ikeda1 · Hiroshi Arakawa1 · Kazuki Sumiyama1 Received: 16 October 2019 / Accepted: 17 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Background Blood group O of ABO blood group system is considered as a risk factor for various bleeding events, but the relationship with endoscopic treatment-associated bleeding has yet to be investigated. This study aimed to evaluate whether blood group O is associated with delayed bleeding after colorectal endoscopic resection. Methods This was a retrospective observational study based on medical records at four university hospitals in Japan. We reviewed the records for consecutive patients who underwent colorectal endoscopic resection from January 2014 through December 2017. The primary outcome was the incidence of delayed bleeding, defined as hematochezia or melena, requiring endoscopy, transfusion, or any hemostatic intervention up to 28 days after endoscopic resection. Multivariate logistic regression analysis was performed to adjust the impact of blood group O on the delayed bleeding. Results Among 10,253 consecutive patients who underwent colorectal endoscopic resection during the study period, 8625 patients met the criteria. In total, delayed bleeding occurred in 255 patients (2.96%). The O group had significantly more bleeding events compared with the non-O group (A, B, and AB) (relative risk, 1.62 [95% confidence interval, 1.24–2.10]; P
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