Conclusion
Epicardial reconnection accounted for the majority of acute PVR in this study, which had difference to endocardial gap in observation time, distribution and EGMs and showed similarity to epicardial PVR in repeat procedures. Presence of AEPVR was independently associated with a smaller left atrium and multiple ablation parameters, which could be explained by nondurable transmural lesion or late manifestation of non-preferential conduction. A sufficient waiting period with detailed mapping for AEPVR is of vital importance to achieve durable isolation.