ablation atrial fibrillation coronary artery bypass ABLATION (CryoAblation) About half of the arrhythmia procedures performed around the world fall into the peri-nodal category. In all, this represents approximately 145,000 procedures annually. In each case of ablation in the peri-nodal region, safety is an absolutely vital concern due to the proximity of the AV node. Reversibility is one of the unique features of CryoTherapy, making it an appropriate choice of ablation therapy when working around the AV node.