Effects of Catheter Ablation on Ventricular Electrical Activity in AF Patients

Overview

This study evaluated changes in premature ventricular complex (PVC) burden following first-time pulmonary vein isolation (PVI) in atrial fibrillation (AF) patients under standard antiarrhythmic therapy. Results showed no consistent significant alteration in PVC frequency at 3 and 12 months post-ablation across different energy modalities.

Background

Atrial fibrillation is the most common adult cardiac arrhythmia, increasing risks of stroke, heart failure, and dementia. Pulmonary vein isolation (PVI) is an established treatment for AF, using cryoballoon, radiofrequency, or pulsed field ablation techniques. Prior studies on PVI's impact on ventricular electrical activity and PVC burden have been inconclusive, often excluding patients with high baseline PVCs or antiarrhythmic therapy. This study aims to clarify the effect of PVI on PVC burden in a real-world cohort with continuous rhythm monitoring.

Data Highlights

Key Findings

• No significant overall change in PVC burden was observed at 3 and 12 months following first-time PVI.
• Different ablation energy sources (CRYO, RF, PFA) did not show statistically significant differences in PVC frequency changes over time.
• Patients with high baseline PVC burden or on antiarrhythmic drugs were included, reflecting a real-world clinical population.
• AF recurrence was analyzed but did not correlate significantly with changes in PVC burden.
• Statistical analyses employed non-parametric tests with Bonferroni correction to account for multiple comparisons.

Clinical Implications

Clinicians can consider that PVI, regardless of ablation modality, does not appear to significantly alter ventricular ectopy as measured by PVC burden in typical AF patients under standard antiarrhythmic therapy. This supports the safety of PVI concerning ventricular electrical stability and suggests that monitoring PVC burden post-ablation may not be necessary in routine practice unless clinically indicated.

Conclusion

Pulmonary vein isolation for atrial fibrillation does not significantly impact premature ventricular complex frequency up to 12 months post-procedure in a real-world cohort. These findings provide reassurance regarding ventricular electrical effects of PVI across common ablation techniques.

References

1. Patel et al. -- Increased outflow tract PVCs post-ablation
2. Jungen et al. -- Rise in PVCs with vagal response
3. Choy et al. -- No significant change in PVCs post-PVI
4. European Society of Cardiology 2024 -- AF Guidelines