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Published on: August 1, 2019
Different methods of 3D QRS area calculation from vectorcardiographic X, Y, and Z Leads
Amit Noheria1, Christian Toquica1, Uzair A Mahmood2
1Department of Cardiovascular Medicine, The University of Kansas Medical Center, Kansas City, Kansas, USA.
Abstract:
3DQRSarea is a strong marker for cardiac resynchronization therapy and can be obtained by taking the (i) summation or the (ii) difference of the areas subtended by positive and negative deflections in X, Y, Z vectorcardiographic electrocardiogram (ECG) leads. We correlated both methods with the instantaneous-absolute-3D-voltage-time-integral (VTIQRS-3D). 3DQRSarea consistently underestimated the VTIQRS -3D, but the summation method was a closer and more reliable approximation. The dissimilarity was less apparent in left bundle branch block (r2 summation .996 vs. difference .972) and biventricular paced ECGs (r2 .996 vs. .957) but was more apparent in normal ECGs (r2 .988 vs. .653).
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