Results
Baseline characteristics are summarized in Table 1 . Between 2014 and 2018, 31 patients with a prior history of MVS (repair or replacement) underwent RFA for VT (16 patients) or PVC (15 patients). Seven (23%) patients had undergone mitral valve replacement (3 patients had mechanical valves) and 24 (77%) patients had prior mitral valve repair (23 with partial annuloplasty ring, 1 with complete annuloplasty ring). The majority of the patients were Caucasian (90%) and male (77%) with a mean age of 62.3±10.8 years. The mean left ventricular ejection fraction (LVEF) was 39.2±13.9%. Obstructive sleep apnea (OSA, 43%), chronic kidney disease (CKD, 35%), and hypertension (HTN, 33%) were the most common comorbidities in our cohort. Seven patients had prior aortic valve surgery (3 of which were at the same time of MVS). All patients were receiving oral anticoagulation prior to the procedure. Four patients with mitral repair were using direct-acting oral anticoagulants (DOAC) while the rest of the cohort was on warfarin. Nine patients had mitral valve prolapse prior to MVS. There were no cases of mitral annular disjunction. Ten patients (32%) had a history of known CAD - 5 patients had prior CABG, 3 patients had prior PCI and 2 patients had both CABG and PCI. Seven patients (23%) had a history of prior ablation of VA at an outside institution.