This week we review a recent large claims database study on WPW in children that aims to identify the true incidence of life threatening events in children with this condition. What is known about the incidence of life threatening events as well as the actual prevalence of WPW amongst children? What are the strengths and limitations of large claims database studies? How high is the risk for VF in the WPW child and how should this knowledge inform decisions regarding ablation? Noted expert in WPW, Dr. Christopher Janson of Children's Hospital of Philadelphia shares his insights this week. https://doi.org/10.1016/j.hrthm.2021.12.009