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Endocardial and epicardial bipolar voltage map during sinus rhythm. No scar area was observed within the endocardium, contrasting with large scar areas within the right ventricular (RV) epicardium. The clinical ventricular tachycardia (VT) was induced and mapped, showing an epicardial circuit with a critical isthmus located at the anterior RV outflow tract. VT was successfully ablated at this site.
