Figure Legends
Figure 1. Left hand panel. Mapping during right ventricular pacing revealing left lateral accessory pathway with eccentric atrial activation noted in the CS channels. Right hand panel.Fluoroscopic view demonstrating position of catheters in RAO 30o view (upper figure) and LAO 40oview (lower figure). The red arrow marks the tip of radiofrequency ablation catheter and the white arrow marks the position of the pacing catheter inside the right ventricle.
Figure 2. Left hand panel. Intracardiac electrograms at the start of radiofrequency energy application. Note that the atrial activation pattern changes on the 2nd beat after initiation of ablation, suggesting a successful site. Also note, the last QRS complex is narrower. Right hand panel. Note the alternating wide and narrow QRS morphology.
Figure 3. Intracardiac electrograms during radiofrequency energy application, the same as the right-hand panel of Figure 2. Note that ventricular activation in the CS channels change along with alternating wide and narrow QRS morphology. Also note that after the narrow QRS beat multiple electrograms follow the ventricular electrogram in the RF distal channel. The first one is likely to be an artefact, the second and third ones being split atrial potentials.