Discussion
This is the first study evaluating the long-term durability of EIVM-induced atrial lesions. Our main results are that 1) EIVM created durable lesions that persisted through time; 2) despite 83% immediate success in achieving MI block, one quarter of these patients underwent late MI reconnection after EIVM. MI gaps are located at the mitral annulus edges and in the coronary sinus, but not within the EIVM created scar.