Impact of cardiac resynchronization therapy on functional mitral regurgitation. Actas Médicas (Ecuador), [S. l.], v. 35, n. S1, p. 9, 2025. DOI: 10.61284/257. Disponível em: https://actasmedicas.ec/index.php/am/article/view/257.. Acesso em: 1 may. 2026.