Keywords: AIV; BrS; Brugada syndrome; ECG; EPS; ER; ERS; Early repolarization; Early repolarization syndrome; Epicardium; Idiopathic ventricular fibrillation; J wave; J-wave syndrome; JWS; LV; Left ventricle; MCV; RVOT; VF; anterior interventricular vein; early repolarization; early repolarization syndrome; electrocardiogram; electrophysiological study; left ventricle/ventricular; middle cardiac vein; right ventricular outflow tract; ventricular fibrillation.