Limits of Global Electrical Heterogeneity (GEH) Parameters in Patients with Normal Electrocardiograms and No Known Cardiovascular Disease Calculator
Hans F. Stabenau and Jonathan W. Waks
Harvard Throndike Arrhythmia Institute
Beth Israel Deaconess Medical Center
Boston, MA
Last update: 9/4/2023
About this calculator:
This calculator displays forecast values and 95% prediction
intervals of GEH vectorcardiographic parameters, based on linear regression models
constructed from vectorcardiographic projections of digital ECG measurements
on N=3,292 patients who had normal ECGs and no known cardiac diagnoses (see Stabenau et al Limits of the Spatial Ventricular Gradient and
QRST Angles in Patients with Normal Electrocardiograms and No Known Cardiovascular Disease Stratified by Age, Sex, and Race,
Journal of Cardiovascular Electrophysiology, 2023.). QRST angles and
associated percentiles in this population were instead modeled using quantile regression, as they
are strongly non-normally distributed.
GEH measurements quantify changes in depolarization and repolarization which have been shown to be
prognostically important in a variety of settings, including risk stratification for
sudden cardiac death in the general population, appropriate primary prevention
implantable cardioverter-defibrillator therapies, and other cardiovascular
diseases.
BRAVEHEART, the open-source software which was used to annotate the ECGs and measure GEH parameters is available at here.
This calculator and its results are for research purposes only and are not intended to
diagnose or treat any disease.
Enter Patient Information:
GEH Normal Limits Estimations: