Electrocardiographic and Electrophysiological Characteristics of Idiopathic Ventricular Arrhythmias Ablated Through Percutaneous Trans-Pericardial Approach

BackgroundIdiopathic epicardial ventricular arrhythmias (VAs) are clustered in the areas of the summit and crux.ObjectiveTo report a group of idiopathic epicardial VAs remote from the summit and crux areas.MethodsIn total, 9 patients (6 males, mean age 32{plus minus}13 years) were enrolled. The locations were identified by epicardial mapping and ablation. The electrocardiographic and electrophysiological characteristics were compared to those of 9 patients who had VAs ablated at the opposite endocardial site.ResultsVAs were identified at the epicardium, with 4 patients had VAs located at the inferior wall, one at the anterior wall, one at the apex and 3 patients had VAs at the lateral wall. A "QS" type at the location-related leads was the only identified surface electrocardiogram indication suggesting epicardial origin (compared to that of the controls, 100% vs 0%, p