RT Journal Article T1 Circulating miR-451a Expression May Predict Recurrence in Atrial Fibrillation Patients after Catheter Pulmonary Vein Ablation A1 Lage Fernández, Ricardo A1 Cebro Márquez, María A1 Vilar Sánchez, Marta A1 González Melchor, Laila A1 García Seara, Javier A1 Martínez Sande, José Luis A1 Fernández López, Xesús Alberte A1 Aragón Herrera, Alana A1 Martínez Monzonís, María Amparo A1 González Juanatey, José Ramón A1 Rodríguez Mañero, Moisés A1 Moscoso Galán, Isabel K1 Atrial fibrillation K1 microRNAs K1 Biomarker K1 Recurrence K1 miR-451a K1 Scar percentage AB Atrial fibrillation is the most prevalent tachyarrhythmia in clinical practice, with very high cardiovascular morbidity and mortality with a high-cost impact in health systems. Currently, it is one of the main causes of stroke and subsequent heart failure and sudden death. miRNAs mediate in several processes involved in cardiovascular disease, including fibrosis and electrical and structural remodeling. Several studies suggest a key role of miRNAs in the course and maintenance of atrial fibrillation. In our study, we aimed to identify the differential expression of circulating miRNAs and their predictive value as biomarkers of recurrence in atrial fibrillation patients undergoing catheter pulmonary vein ablation. To this effect, 42 atrial fibrillation patients were recruited for catheter ablation. We measured the expression of 84 miRNAs in non-recurrent and recurrent groups (45.2%), both in plasma from peripheral and left atrium blood. Expression analysis showed that miRNA-451a is downregulated in recurrent patients. Receiver operating characteristic curve analysis showed that miR-451a in left atrium plasma could predict atrial fibrillation recurrence after pulmonary vein isolation. In addition, atrial fibrillation recurrence is positively associated with the increment of scar percentage. Our data suggest that miRNA-451a expression plays an important role in AF recurrence by controlling fibrosis and progression PB MDPI YR 2023 FD 2023 LK http://hdl.handle.net/10347/32194 UL http://hdl.handle.net/10347/32194 LA eng NO Lage, R.; Cebro-Márquez, M.; Vilar-Sánchez, M.E.; González-Melchor, L.; García-Seara, J.; Martínez-Sande, J.L.; Fernández-López, X.A.; Aragón-Herrera, A.; Martínez-Monzonís, M.A.; González-Juanatey, J.R.; et al. Circulating miR-451a Expression May Predict Recurrence in Atrial Fibrillation Patients after Catheter Pulmonary Vein Ablation. Cells 2023, 12, 638. https://doi.org/10.3390/cells12040638 NO This research was funded by Xunta de Galicia: Programa de Consolidación de Unidades de Investigación Competitivas do SUG (GRC 2019/02), the Centro Singular de Investigación de Galicia acreditación 2019–2022 (ED431G 2019/02), the European Union European Regional Development Fund (ERDF), and National Institute of Health “Fondo de Investigaciones Sanitarias, Instituto de Salud Carlos III (ISCIII)” Madrid, Spain (PI18/00821 and CIBERCV CB16/11/00226) DS Minerva RD 24 abr 2026