Coexistence of a left posteroseptal tract with persistent left superior vena cava. Ablation through an anomalous superior vena cava.

A case of a young male with WPW syndrome due to a left posteroseptal tract associated with a persistent left superior vena cava is described. After unsuccessful ablation attempts with a number of different approaches at conventional target sites, the accessory connection was successfully ablated within the coronary sinus. This was achieved only when the ablation catheter was introduced through the persistent left superior vena cava.