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Figure 1 Twelve-lead surface ECG from six different patients with idiopathic ventricular tachycardia that was successfully ablated in the right ventricular outflow tract (RVOT), in the left ventricular outflow tract (LVOT), in the aortic sinus of Valsalva (AO), in the coronary sinus (CS), in the main pulmonary artery (PA), and in the epicardial space via percutaneous pericardial access (EPI), respectively. Note that all ECGs present with left bundle-branch block morphology, inferior axis, R/S transitional zone in the precordial leads V₃, and negative QRS complex in lead I.