Figure 4. Electroanatomical endocardial 3D mapping (2 projections of the right ventricle) shows normal electrograms confirming the idiopathic nature of the arrhythmia (Panel A). The 3D shell is used for navigation to precisely define earliest ventricular activation that is the target area for radiofrequency delivery (red dots). Intracardiac recording at the site of ablation shows an early presystolic electrogram (Panel B), where radiofrequency delivery instantaneously terminates the VT (exit block is shown) (Panel B and C).