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Figure 3 Successful Ablation Site of a PVC Originating From the Right Coronary Cusp

The first beat is a sinus beat and the second is a premature ventricular contraction (PVC). At the successful ablation site, atrial and His bundle (HB) (arrows) electrograms were recorded during sinus rhythm and during the PVC; a far-field electrogram (single arrowhead) preceding the QRS onset by 18 ms and the following near-field electrogram (double arrowheads) were observed in the right ventricular HB region. Abbreviations as in Figures 1 and 2.