Incidence and risk factors of colorectal delayed post‐polypectomy bleeding in patients taking antithrombotics

OBJECTIVE: In this study we aimed to investigate the incidence and risk factors for delayed post‐polypectomy bleeding (DPPB) in Chinese patients taking antithrombotics including antiplatelet agents and anticoagulants. METHODS: A retrospective study was conducted in patients who underwent colorectal polypectomy from January 2017 to May 2020. Their demographic characteristics, features of the polyps including number, size, morphology, and location, and use of antiplatelet agents and anticoagulants were collected. The incidence and risk factors for DPPB were compared between the patients with and without antithrombotic use. RESULTS: A total of 5152 polyps from 2267 patients were resected under endoscopy. Of these patients, 35 (1.54%) experienced DPPB. Compared with the control group who did not take antithrombotics (1.18%), the incidence of DPPB was significantly higher in patients treated with heparin bridge (HB) therapy (17.39%; P < 0.001) and clopidogrel (4.88%; P = 0.022), but did not differ in patients taking aspirin (1.28%), dual antiplatelet therapy (3.70%), warfarin alone (0%), or direct oral anticoagulants (3.85%). Using the multivariate analysis, HB therapy (odds ratio [OR] 16.735, 95% confidence interval [CI] 4.320‐64.834, P < 0.001), male sex (OR 3.825, 95% CI 1.298‐11.265, P = 0.015), polyps >1 cm (OR 4.584, 95% CI 1.782‐11.794, P = 0.002) and rectal polyps (OR 8.820, 95% CI 3.968‐19.602, P < 0.001) were independently associated with a high risk of DPPB. CONCLUSIONS: HB and clopidogrel therapies significantly increase the incidence of DPPB. HB therapy, male sex, polyp size and polyps located in the rectum are significant risk factors for DPPB.