Fig. 3From: Ablation of idiopathic ventricular arrhythmias originating from basal cardiac crux regiona A 12-lead ECG of the clinical PVC. b Left panel: intracardiac EGM at the ablation site of the inferior septal process via an RA approach showed V and A signals. Middle panel: right ventriculography. Right panel: fluoroscopic view and electro-anatomical mapping with ablation catheter positioning via the RA infero-medial aspect, which is adjacent to inferior septal process. c Left panel: intracardiac EGM at the successful ablation site showed the earliest ventricular activity of 38 ms preQRS. Right panel: the application of RF energies at the inferior septal process via a retrograde trans-aortic approach. Note the far-field signal of PVC at the distal ablation might indicate intra-mural origin. Yellow arrow showed the ablation site via RA approach, and white arrow indicates the successful ablation site from retrograde approach. Note that, the sandwich lesion sets to completely eliminate the clinical PVCBack to article page