RT Journal Article T1 A Scoring System to Determine Risk of Delayed Bleeding After Endoscopic Mucosal Resection of Large Colorectal Lesions. A1 Albéniz, Eduardo A1 Fraile, María A1 Ibáñez, Berta A1 Alonso-Aguirre, Pedro A1 Martínez-Ares, David A1 Soto, Santiago A1 Gargallo, Carla Jerusalén A1 Ramos Zabala, Felipe A1 Álvarez, Marco Antonio A1 Rodríguez-Sánchez, Joaquín A1 Múgica, Fernando A1 Nogales, Óscar A1 Herreros de Tejada, Alberto A1 Redondo, Eduardo A1 Pin, Noel A1 León-Brito, Helena A1 Pardeiro, Remedios A1 López-Roses, Leopoldo A1 Rodríguez-Téllez, Manuel A1 Jiménez, Alejandra A1 Martínez-Alcalá, Felipe A1 García, Orlando A1 de la Peña, Joaquín A1 Ono, Akiko A1 Alberca de Las Parras, Fernando A1 Pellisé, María A1 Rivero, Liseth A1 Saperas, Esteban A1 Pérez-Roldán, Francisco A1 Pueyo Royo, Antonio A1 Eguaras Ros, Javier A1 Zúñiga Ripa, Alba A1 Concepción-Martín, Mar A1 Huelin-Álvarez, Patricia A1 Colán-Hernández, Juan A1 Cubiella, Joaquín A1 Remedios, David A1 Bessa I Caserras, Xavier A1 López-Viedma, Bartolomé A1 Cobian, Julyssa A1 González-Haba, Mariano A1 Santiago, José A1 Martínez-Cara, Juan Gabriel A1 Valdivielso, Eduardo A1 Guarner-Argente, Carlos A1 Endoscopic Mucosal Resection Endoscopic Spanish Society Group, K1 ASA K1 Colon Cancer K1 Mucosectomy K1 Prognostic Factor AB After endoscopic mucosal resection (EMR) of colorectal lesions, delayed bleeding is the most common serious complication, but there are no guidelines for its prevention. We aimed to identify risk factors associated with delayed bleeding that required medical attention after discharge until day 15 and develop a scoring system to identify patients at risk. We performed a prospective study of 1214 consecutive patients with nonpedunculated colorectal lesions 20 mm or larger treated by EMR (n = 1255) at 23 hospitals in Spain, from February 2013 through February 2015. Patients were examined 15 days after the procedure, and medical data were collected. We used the data to create a delayed bleeding scoring system, and assigned a weight to each risk factor based on the β parameter from multivariate logistic regression analysis. Patients were classified as being at low, average, or high risk for delayed bleeding. Delayed bleeding occurred in 46 cases (3.7%, 95% confidence interval, 2.7%-4.9%). In multivariate analysis, factors associated with delayed bleeding included age ≥75 years (odds ratio [OR], 2.36; P The risk of delayed bleeding after EMR of large colorectal lesions is 3.7%. We developed a risk scoring system based on 6 factors that determined the risk for delayed bleeding (receiver operating characteristic curve, 0.77). The factors most strongly associated with delayed bleeding were right-sided lesions, aspirin use, and mucosal defects not closed by hemoclips. Patients considered to be high risk (score, 8-10) had a 40% probability of delayed bleeding. YR 2016 FD 2016-03-24 LK http://hdl.handle.net/10668/9964 UL http://hdl.handle.net/10668/9964 LA en DS RISalud RD Apr 7, 2025