Retrograde left‐sided ablation protocol
INFILTRATION
After the infiltration of the local anesthetic, right femoral artery access was achieved using ultrasound guidance. Unfractionated heparin of 100 U/kg was administered after arterial vascular access was achieved. A 4‐mm nonirrigated tip ablation catheter was advanced to the left ventricle via the aortic valve along the anterior septum. RF energy was applied at sites at which the largest possible His bundle deflection was recorded, irrespective of the size of the atrial electrogram (Figure Intracardiac electrogram recordings (A) from the radiofrequency ablation catheter illustrating maximal His potential (arrows) and fluoroscopy location in the posterior–anterior (B) and left anterior oblique (C) views during left‐sided retrograde ablation.