Conclusion
RF can be delivered to deeper foci through a 3830-pacemaker lead with maximum size lesion formation using proximal unipolar direct delivery and proximal close bipolar as the return patch. In humans, it opens a path to attain deep septal foci (LV summit) or epicardial structures (vein of Marshall, transmural ablation from RF endocardial to LV coronary sinus lead as return patch): using standard, 4F pacemaker leads, and 2F small EP catheters or even isolated guidewires.
Keywords: Ablation, Deep foci, Ventricular Arrhythmia, Radiofrequency, Pacemaker lead