Clinical application of QT dispersion on ventricular hypertrophy using magnetocardiogram

QT dispersion is defined as the difference between the maximum QT and minimum QT intervals on standard 12-lead electrocardiogram (ECG). It is a new index of the homogeneity of ventricular repolarization and considered to be a marker for the risk of malignant ventricular arrhythmia [1, 2]. There have been, however, no detailed studies except in myocardial infarction on QT dispersion using magnetocardiogram (MCG) [3]. The MCG can detect cardiac electric currents with high positional resolution compared to the ECG, which detects the electrical difference in electrical potential [4]. In addition, the location of the source of the electric current can be non-invasively determined by MCG [4]. In the present study, QT dispersions in patients with left or right ventricular hypertrophy were studied using the MCG.