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. 2015 Jul 24;4(7):e002057. doi: 10.1161/JAHA.115.002057

Figure 1.

Figure 1

Illustration of ischemia-induced ventricular repolarization dispersion. Left side shows normal repolarization signal propagation and normal coronary perfusion with corresponding T-wave eigenvectors and loop morphology in a 54-year-old male with no coronary events. Right side shows a dispersed repolarization signal and diminished coronary perfusion with corresponding T-wave eigenvectors and loop morphology in a 72-year-old female with NSTEMI. A, Myocardial tissue. B, Normal repolarization wave and response to injury currents. C, PCA-derived ECG beats. D, Plot of T-wave amplitude for first PCA beat (x axis) versus second PCA beat (y axis). Ratio between these eigenvalues is T-wave complexity. ECG indicates electrocardiogram; NSTEMI, non-ST elevation myocardial infarction; PCA, principal component analysis.