Trajectory Plots Of Extrema In Magnetic And Potential Maps Of Patients With Ventricular Tachycardia

Abstract

Trajectories were plotted of the extrema in magnetic field maps (MFM) and body surface potential maps (BSPM) of cardiac activities during the QRS and ST-T interval of 45 subjects. The subjects are subdivided into 3 groups comprising 15 normals, 15 patients with myocardial infarction (MI) and 15 patients with induceable sustained ventricular tachycardia (VT). The results show that the trajectories of the extrema of VT patients in particular, show extended fragmentation. This feature is used to distinguish VT patients from the MI patient group. The results suggest that, based on this criterion, MFM trajectory plots are a better (than BSPM) means of recognizing VT patients.

Magnetocardiography and exercise testing: data acquisition and data processing

“…Localization of arrhythmogenic foci, risk stratifications for the patient at risk for sudden cardiac death due to ventricular arrhythmias and the detection of graft rejection after heart transplantation are topics presently under clinical investigation [1, 2,3]. No attempts have been made to study the magnetocardiogram (MCG) during physical exercise conditions, which might provide a better insight into the myocardial repolarization process.…”