My 9 year old daughter has EA, as well as a PFO and WPW. Her valve is not leaking a whole lot so we have decided to wait for surgery. Her rhythm issues are her biggest . She is on a high dose of Atenolol. But still goes into svt. She has now started blacking out and getting dizzy. She had an ablation last year and it appeared to be successful. However a month later at follow up her delta wave was back. Our cardiologist said he would not try the ablation again until she was bigger because her AP is on the outside of her heart in a posterior septal location. My guess is that she needs to be bigger because the size of tools, but my question is, if a catheter is threaded through her femoral artery into the inside of her heart, how is the AP ablated when it’s on the outside? Does the radio frequency burn through her heart? Would he use Cryo ablation instead?