Delta ventriculo‐atrial (ΔVA) time distinguishes successful site of ablation of septal accessory pathways (AP). A simple maneuver to determine if septal accessory pathway ablation requires a left atrial approach. Excellent article by Klein G et al.
Again...the beauty of the incredible technology that we have today. This far left lateral/left anterior pathway would have been doable but very difficult without this open window mapping. With it, one burn got the pathway immediately.