RT Journal Article T1 Clip Closure After Resection of Large Colorectal Lesions With Substantial Risk of Bleeding. A1 Albéniz, Eduardo A1 Álvarez, Marco Antonio A1 Espinós, Jorge C A1 Nogales, Oscar A1 Guarner, Carlos A1 Alonso, Pedro A1 Rodríguez-Téllez, Manuel A1 Herreros de Tejada, Alberto A1 Santiago, José A1 Bustamante-Balén, Marco A1 Rodríguez Sánchez, Joaquín A1 Ramos-Zabala, Felipe A1 Valdivielso, Eduardo A1 Martínez-Alcalá, Felipe A1 Fraile, María A1 Elosua, Alfonso A1 Guerra Veloz, María Fernanda A1 Ibáñez Beroiz, Berta A1 Capdevila, Ferrán A1 Enguita-Germán, Mónica K1 Complication K1 GSEED-RE K1 Polyp Removal K1 Prevention AB It is not clear whether closure of mucosal defects with clips after colonic endoscopic mucosal resection (EMR) prevents delayed bleeding, although it seems to have no protective effects when risk is low. We performed a randomized trial to evaluate the efficacy of complete clip closure of large (≥2 cm) nonpedunculated colorectal lesions after EMR in patients with an estimated average or high risk of delayed bleeding. We performed a single-blind trial at 11 hospitals in Spain from May 2016 through June 2018, including 235 consecutive patients who underwent EMR for large nonpedunculated colorectal lesions with an average or high risk of delayed bleeding (based on Spanish Endoscopy Society Endoscopic Resection Group score). Participants were randomly assigned to groups that received closure of the scar with 11-mm through-the-scope clips (treated, n = 119) or no clip (control, n = 116). The primary outcome was proportion of patients in each group with delayed bleeding, defined as evident hematochezia that required medical intervention within 15 days after colonoscopy. In the clip group, complete closure was achieved in 68 (57%) cases, with partial closure in 33 (28%) cases and failure to close in 18 (15%) cases. Delayed bleeding occurred in 14 (12.1%) patients in the control group and in 6 (5%) patients in the clip group (absolute risk difference, reduction of 7% in the clip group; 95% confidence interval, -14.7% to 0.3%). After completion of the clip closure, there was only 1 (1.5%) case of delayed bleeding (absolute risk difference, reduction of 10.6%; 95% confidence interval, -4.3% to 17.9%). In a randomized trial of patients with large nonpedunculated colorectal lesions undergoing EMR, we found that clip closure of mucosal defects in patients with a risk of bleeding can be a challenge, but also reduces delayed bleeding. Prevention of delayed bleeding required complete clip closure. ClinicalTrials.gov ID: NCT02765022. YR 2019 FD 2019-07-27 LK http://hdl.handle.net/10668/14340 UL http://hdl.handle.net/10668/14340 LA en DS RISalud RD Apr 17, 2025