Localization of septal accessory pathways using simulated magnetic field maps as templates

Radiofrequency (RF) catheter ablation has become a method of choice in curative treatment of pharmacologically refractory paroxysmal supraventricular tachycardias involving an accessory atrioventricular connection. Prerequisite for successful ablative treatment is the precise identification of an aberrant pathway. Although magnetic field mapping has shown promise in facilitating the localization of preexcitation sites prior to RF intervention (see, e.g., [1]), its ability in discriminating among different septal accessory pathways has yet to be confirmed. The aim of this study is to develop criteria for such discrimination using computer simulations.