Follow up
At the 12-month follow-up, fifty-eight (87.9%) patients were free from AF/AT in group 1 compared with 81 (64.8%) in group 2 (p<0.001), among them 2 in group 1 and 3 in group 2 were on AAD during the 12-month follow-up. And for 53 patients with successful EI-VOM, freedom from AF/AT recurrence was achieved in 47 (88.7%). In cox regression, patients in group 1 had higher survival freedom from AT recurrence after adjusted for age, LA diameter, LSPAF, hypertension, and heart failure (HR 0.27 95%CI 0.12-0.59) (Figure 4 ).
Four of 8 patients with recurrent AF/AT in group 1 underwent a redo procedure. One of them had recurrent AF, two were proved to be perimitral AFL eliminated by RF applications at the annulus side of MI and another one had a conduction gap at the RPV. In group 2, 12 of 44 patients with recurrent AF/AT underwent a redo procedure, including 4 AF, 3 perimitral AFL, 2 roofline-related flutter, 2 flutters related to RSPV conduction recovery, one scar-related reentry.