Catheter inversion technique for ablation of parahisian accessory pathway.

A case of WPW Syndrome due to parahisian accessory pathway was ablated by the catheter inversion technique. The pathway could not be eliminated by direct femoral approach using repeated high radiofrequeny energy ablation. No pathway potential was seen in the aortic cusps. Instead, it was successfully ablated by curving the ablation catheter underneath the septal leaflet of the tricuspid valve to gain direct contact with the pathway.