Twin Atrioventricular Nodal Reentrant Tachycardia Associated with Heterotaxy Syndrome with Malaligned Atrioventricular Canal Defect and Atrioventricular Discordance.

There are limited data on the experience of transbaffle access for catheter ablation in patients who have undergone a Fontan palliation for complex congenital heart. Nevertheless, these issues will be encountered more frequently, because patients who have undergone Fontan palliation continue to survive into adulthood and develop a variety of arrhythmias that may be refractory to medical therapy.