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Electrophysiologic Characteristics of Ventricular Arrhythmias Arising From the Aortic Mitral Continuity – Potential Role of the Conduction System

(1) High-frequency/near-field potentials were noted prior to ventricular myocardial activation on the aortic mitral continuity (AMC) at most sites of successful ablation for arrhythmia from this region. (2) Intracardiac ultrasound allowed confirmation of bipolar electrode contact on the AMC. (3) In some instances but not all, similar signals were noted during sinus beats. (4) No similar signals were noted in this region during ventricular pacing or PVCs arising from other locations, such as with right ventricular pacing, including the right ventricle and left ventricle. (5) Ablation at the site was successful in the majority of patients to eliminate this arrhythmia.