This week we devote the episode to congenital cardiac electrophysiology. We review 2 works - the first on outcomes of ablation for the treatment of atrial arrhythmias in Ebstein's anomaly and the second focuses on the ablation of posteroseptal accessory pathways in children, risks for coronary injury and strategies to avoid this potential serious complication. We are joined by Dr. Christopher McLeod of the Mayo Clinic to speak about his work on ablation of atrial arrhythmias in Ebstein's. His large experience and insights provide good perspective on this very challenging group of patients.