Clinical implications
In the present study, we investigated the SVC-ERP and inducibility of SVC-AF after PVI because the frequency of SVC origin was the highest among non-PV foci for AF. We revealed that the SVC-ERP was significantly associated with pacing inducibility of AF after adjusting for a longer SVC diameter. It was suggested that the measurement of the SVC-ERP may predict SVC-AF. Furthermore, in our study, the dispersion of the SVC-ERP did not contribute to arrhythmogenicity at least just above the SVC-RA junction. Only the shortest SVC-ERP may be an indicator of SVC-AF inducibility.