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Intracardiac and left inferior pulmonary vein electrograms during VOM ethanol infusion. Top, selected surface ECG leads. HBE, His bundle electrograms. CS, coronary sinus electrograms. LASSO, circular duodecapolar signals recorded from the left inferior pulmonary vein ostium. During ethanol infusion an atrial extrasystole is seen (third beat). By the fifth beat, complete elimination of all pulmonary vein potentials is seen.
