Figure legend
Figure 1 A: Mild preexcitation with slightly shortened H-V interval
(21ms) was observed at baseline. RVA was preceded by HIS. B: Atrial
pacing and the extrastimulus resulted in minimal preexcitation and a
fixed H-V interval during A-H prolongation, with activation of RVA
remaining later than HIS. AP=accessory pathway; CS=coronary sinus;
RVA=right ventricular apex.
Figure 2 A: After isoproterenol infusion, prominent delta wave was
present with an H-V interval of -12ms. B: Wide complex tachycardia
without anterograde His was induced, during which atrial overdrive
pacing entrained the ventricles with identical QRS configuration and an
A-V-A response following cessation. CS=coronary sinus; RVA=right
ventricular apex.
Figure 3 A: 2 discrete AP potentials were recorded by ABLp. B: The
interval from split pathway potentials to local V increased when the
atrioventricular AP blocked spontaneously. C: Pulling back the catheter
made both signals appearing on distal
ABL.
See text for discussion. ABL=ablation catheter; AP=accessory pathway;
CS=coronary sinus; RVA=right ventricular apex.
Supplemental Figure: Accelerated rhythm with the identical QRS
configuration to tachycardia was present due to enhanced pathway
automaticity during radiofrequency. ABL=ablation catheter; CS=coronary
sinus; RVA=right ventricular apex.