Abstract
The source localization of various arrhythmias has become more important since catheter ablation has been introduced to clinical antiarrhythmic therapy. Magnetocardiography (MCG) is thought to be useful for non-invasively localizing foci of the various arrhythmias. The accuracy in the source localization is important in such application. However the accuracy by MCG is still unclear. To make the accuracy clear, the MCG of a subject with the WPW syndrome was measured using a 7-channel first order DC-SQUID gradiometer system. The site of the accessory pathway was estimated using the single dipole model assuming the body to be the semi-infinite conductor. An electrophysiological study (EPS) was also carried out for the localization. The difference in distance of the accessory pathway sites estimated by MCG and EPS was less than 7mm. The location of accessory pathway was confirmed by an epicardial mapping in the surgical treatment. It is concluded that non-invasive MCG is a very helpful method for catheter ablation in localizing the site of focus in various kinds of the arrhythmias.
