RESUMO
PURPOSE: Atrial fibrillation (AF) ablation is a common procedure to reduce cardiovascular morbidity but is limited by recurrence. The objective of this study was to determine if post-ablation acute surface P wave morphology and other electrocardiographic parameters correlate with AF recurrence. METHODS: The Avoiding Bladder Catheters During AF ablation (ABCD-AF) trial was a randomized, prospective trial in 160 subjects undergoing AF ablation. The present study examined correlation between AF recurrence in follow-up and acute post-ablation electrocardiographic P wave parameters. RESULTS: Median follow-up was 255 (188, 306) days. The ABCD-AF cohort had a mean age of 62.7 ± 12.8 with 32.1% being females. Rate of recurrent AF was 35.8%, with a median time to AF of 135 (109, 182) days. There was no baseline demographic associated with AF recurrence. There was more AF recurrence in those with longer follow-up (p = 0.001). Lead 2 PR interval, lead 2 P wave duration/PR (Pdur/PR), lead V1 PR interval, and lead V1 Pdur/PR were all significantly associated with recurrent AF (p = 0.03, 0.02, 0.01, 0.01). Longer PR and shorter Pdur/PR predicted AF recurrence. In a multivariable model, lead V1 Pdur/PR provided the best predictor of AF recurrence, with an odds ratio of 0.018 (p = 0.016) per standard deviation change. CONCLUSIONS: Shorter P wave duration combined with longer AV node delay, as measured by proportion of the PR that the P wave occupies, was the best predictor of AF recurrence post-ablation.