Atrioventricular nodal radiofrequency ablation. (A) Fluoroscopic view at the point of successful repeated radiofrequency ablation. (B) 3D cardiac mapping results: red spheres—repeated radiofrequency ablation applications; green—elements of conduction system; blue—zones of His bundle pacing lead projections. IVS, interventricular septal; LV, left ventricular; RV, right ventricular.