Patient cohort
Following institutional review board approval (IRB), we identified all patients with prior MVS (replacement or repair) who developed ventricular arrhythmia (VA), defined as occurrence of VT or PVC who then underwent radiofrequency CA for this between January 2013 and December 2018. A total of 31 patients with prior history of MVS who underwent ablation for VT (16 patients) or PVC (15 patients) were identified. Patients with congenital heart disease were excluded. The Mayo Clinic comprehensive clinical record system was used to abstract data.