Abstract
AimThe aim of this study was to investigate the influence of geometrical factors on the ECG morphology and vectorcardiogram (VCG) parameters. MethodsPatient-tailored models based on five heart-failure patients with intraventricular conduction defects (IVCDs) were created. The heart was shifted up to 6cm to the left, right, up, and down and rotated ±30° around the anteroposterior axis. Precordial electrodes were shifted 3cm down. ResultsGeometry modifications strongly altered ECG notching/slurring and intrinsicoid deflection time. Maximum VCG parameter changes were small for QRS duration (−6% to +10%) and QRS-T angle (−6% to +3%), but considerable for QRS amplitude (−36% to +59%), QRS area (−37% to +42%), T-wave amplitude (−41% to +36%), and T-wave area (−42% to +33%). ConclusionThe position of the heart with respect to the electrodes is an important factor determining notching/slurring and voltage-dependent parameters and therefore must be considered for accurate diagnosis of IVCDs.
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