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Figure 1 (A) Fluoroscopic 30° right anterior oblique (RAO) and 60° left anterior oblique (LAO) views of the position of the electrical guidewire introduced into the conus branch through the right coronary artery for epicardial mapping (Epi), as well as the quadripolar deflectable catheter at the endocardium of the free wall at the right ventricular outflow tract for endocardial mapping (Endo). (B) Surface electrocardiographic leads V1, V2 and V5 and intracardiac electrograms of the epicardium (Epi) and endocardium (Endo) at the free wall at the right ventricular outflow tract before (Pre) and after (Post) the administration of a class IC anti-arrhythmic drug in Patient 1 (asymptomatic patient). A definite local electrogram was recorded after termination of the QRS complex at the epicardium (arrows), and the duration of the local electrogram after termination of the QRS complex after class IC anti-arrhythmic drug administration was more prolonged at the epicardium than at the endocardium in Patient 1.
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