Difference between Epicardial and Gap Conduction in Acute PVR
AEPVR could be considered as an intermediate state of lesion formation between durable isolation and endocardial conduction gap. The 2 types of PVR can be distinguished by remapping the regions of PVs and the antrum. Compared to AEPVR mostly at interpulmonary regions, the endocardial or transmural reconnections were distributed widely in almost all segments along the ablation circle. The typical characteristics of endocardial gap was the near-field EGMs present at the prior lesion with fractionation. Although there were multiple factors in terms of ablation parameters associated with AEPVR in the whole cohort, inter-lesion distance was the only factor showing difference between endocardial gap and AEPVR in our study, suggesting its tendency to impact the endocardium.