Does QT dispersion derived from the simple orthogonal lead system predict risk for sustained ventricular tachyarrhythmias?

Experimental and clinical studies suggest that QT dispersion (QTd) obtained from a standard 12 lead ECG reflects regional inhomogeneity in ventricular repolarization and that increased QTd may predict risk of ventricular tachyarrhythmias (VT). However, QTd measurement process from 12 lead ECG is impractical for clinical use. In order to obviate this limitation, we evaluated QTd derived from a simple orthogonal 3-lead system versus 12 lead ECG in predicting inducibility of VT. Study results show that a simple orthogonal system may be successfully used for QTd measurements, Increased QT dispersion can be a potential marker of VT inducibility.