Does anyone know anything about it? My 5 yo DD has had a few episodes of tachycardia recently and finally got in to see the pediatric cardiologist this morning. He said he wasn't 100% sure, but he thought she had Wolff-Parkinson-White syndrome. It is apparently the most common cause of tachycardia in children (0.1 - 0.3%), and can be relatively asymptomatic, but he thought that she would eventually need to be on beta-blockers or have a surgery to ensure normal quality of life. He gave us a letter to give her teachers to instruct them what they need to do in case of an episode and wants us to record every episode of tachycardia in a diary so we can get an idea of its severity. I'm trying not to worry too much but I was just wondering if anyone else knew anything about it from personal experience. I'm trying to avoid Dr. Google because there are too many worst case scenarios out there. Thanks!