congenital defectcoronary ischemiacoronary sinusheart failuremitral regurgitationtranscatheter interventionsFUNCTIONAL MITRAL REGURGITATIONCHRONIC REFRACTORY ANGINAHEART-FAILUREVALVE ANNULUSVENOUS RETROPERFUSIONANATOMICAL VARIATIONSCOMPUTED-TOMOGRAPHYCARDIAC VEINLEFT ATRIUMREDUCER