(A) Activation map of the VT induced (left postero-lateral view, Ao, aorta; M, mitral annulus; P, pulmonary annulus; T, tricuspid annulus). The position of the ablation lesions are indicated by the arrow. (B) The zone harbouring the diastolic potential, where ablation was performed was located in a small region of normal voltage along the anterior aspect of the LV outflow tract (arrow). (C) A mid-diastolic potential found in this given spot (blue line, arrow). The QRS pattern during entrainment in the middle and at the exit site of VT isthmus are shown in D and E. A 93.8% correlation was observed between the clinical VT and the pacing, with a long S-QRS in the middle of the isthmus and a short one at the exit site. LV, left ventricle; VT, ventricular tachycardia.