Radiofrequency ablation of frequent premature ventricular contractions in cardiac resynchronization therapy nonresponders significantly improved mean left ventricular ejection fraction from 26.2% to 32.7%.
Observational (n=65)
Yes
Mean Difference: 6.42
Absolute Event Rate: 32.7% vs 26.2%
p-value: p=<0.001
Radiofrequency ablation of premature ventricular ectopy improves the efficacy of cardiac resynchronization therapy in nonresponders Lakkireddy, Dhanunjaya; Di Biase, Luigi; Ryschon, Kay; Biria, Mazda; Swarup, Vijay; Reddy, Yeruva Madhu; Verma, Atul; Bommana, Sudharani; Burkhardt, David; Dendi, Raghuveer; Dello Russo, Antonio; Casella, Michela; Carbucicchio, Corrado; C. Tondo ; Dawn, Buddhadeb; A. Natale 2012 Abstract Objectives: This study sought to examine whether suppressing premature ventricular contractions (PVC) using radiofrequency ablation improves effectiveness of the cardiac resynchronization therapy (CRT) in nonresponders. Background: CRT is an effective strategy for drug refractory congestive heart failure. However, one-third of patients with CRT do not respond clinically, and the causes for nonresponse are poorly understood. Whether frequent PVC contribute to CRT nonresponse remains unknown. Methods: In this multicenter study, CRT nonresponders with >10,000 PVC in 24 h who underwent PVC ablation were enrolled from a prospective database. Results: Sixty-five subjects (age 66.6 ± 12.4 years, 78% men, QRS duration of 155 ± 18 ms) had radiofrequency ablation of PVC from 76 foci. Acute and long-term success rates of ablation were 91% and 88% in 12 ± 4 months of follow-up. There was significant improvement in left ventricular (LV) ejection fraction (26.2 ± 5.5% to 32.7 ± 6.7 %, p 22% in 24 h. Conclusions: Frequent PVC is an uncommon yet significant cause of CRT nonresponse. Radiofrequency ablation of PVC foci improves LV function and New York Heart Association class and promotes reverse remodeling in CRT nonresponders. PVC ablation may be used to enhance CRT efficacy in nonresponders with significant PVC burden.
“PVCs are an uncommon but potentially curable cause of nonresponse to CRT and repeated exacerbations of HF. The probable underlying mechanism is both low percentage of BiV pacing and detrimental effect of the arrhythmia itself, seen even in hearts without structural disease”
Lakkireddy et al. (Wed,) conducted a observational in Cardiac Resynchronization Therapy (CRT) Nonresponders with frequent Premature Ventricular Contractions (PVC) (n=65). Radiofrequency ablation of PVCs vs. Pre-ablation baseline was evaluated on Left ventricular ejection fraction (LVEF) (mean improvement 6.42%, p=<0.001). Radiofrequency ablation of frequent premature ventricular contractions in cardiac resynchronization therapy nonresponders significantly improved mean left ventricular ejection fraction from 26.2% to 32.7%.