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  • Title: Beat-to-beat determinants of the beat-to-beat temporal and spatial variability of repolarization.
    Author: Feeny A, Tereshchenko LG.
    Journal: J Electrocardiol; 2016; 49(3):417-22. PubMed ID: 26874566.
    Abstract:
    BACKGROUND: The goal of this study was to compare the time series predictors of beat-to-beat variability in repolarization in healthy individuals. METHODS: Spatial QRS- and T-vector amplitudes, spatial QRS-T, RR' and TT' angles, RR' and QT intervals, and QRS- and T-loop roundness were measured on 453 consecutive sinus beats in 168 healthy subjects (mean age 39.8±15.6years; 50% men; 93% white). Panel time-series regression models were adjusted by age, sex, and race. Appropriate time series of ECG metrics served as predictors and outcomes. RESULTS: Increase in T-loop roundness index by 0.1 was associated with 1.1° (95%CI 0.9-2.2; P=0.048) increase in corresponding TT' angle. One unit increase in a respiration index was associated with 4ms (95%CI 0.6-7.0; P=0.021) increase in QT interval. CONCLUSIONS: Spatial TT' angle and beat-to-beat variability in T-loop roundness represent intrinsic measures of repolarization variability. QT interval variability characterizes the effect of respiration and heart rate variability.
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