A standard electrocardiogram is originated in the main electrical vector projection to different ECG leads. The frequency range of examined signal is mostly under 50 Hz.
VDI technology is based on a different principle. It analyzes ultrahigh-frequency (UHF, 150-1000Hz) components contained in the QRS complex. Steep cell membrane potential gradients (Phase 0 of the myocardial action potential) represent a source of UHF oscillations during myocardial depolarization – UHF transmitter.
The UHF signal intensity decreases with distance from the source. Thus, the UHF signal intensity distribution in chest leads can determine the temporal-spatial activation in ventricular volumes.
VDI MONITOR | Ventricular Dyssynchrony Imaging technology