Figure 2 A:Surface electrocardiogram (ECG) after the ethanol infusion to the vein
of Marshall (VOM). B: Intracardiac ECG after the ethanol
infusion to VOM. Arrows indicate P waves. Note that P waves preceded
atrial potentials in the LAA, and ventricular potentials preceded atrial
potentials in the CS. C: Intracardiac ECG after the restoration
of atrioventricular conduction. CS, coronary sinus; LAA, left atrial
appendage.