Supplemental Figure 1Electrophysiological observations during ventricular pacing.
Manifestation of retrograde conduction via the ILA-SSP (indicated by dot arrow) during a right ventricular (RV) apical extrastimulus with an S1-S2 coupling interval of 340 ms after basic overdrive pacing simultaneously from the coronary sinus (CS) and RV with an S1-S1 cycle length of 750 ms. Please note the earliest site of the atrial activation (A2) during retrograde conduction was over the ILA-SSP and the S2-A2 interval was measured as 440 ms in the distal CS.
Supplemental Figure 2 Electrophysiological observations during ablation of SVT2
Junctional rhythm appeared during ablation of SVT2