کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5986216 | 1178841 | 2016 | 6 صفحه PDF | دانلود رایگان |
BackgroundThe goal of this study was to compare the time series predictors of beat-to-beat variability in repolarization in healthy individuals.MethodsSpatial QRS- and T-vector amplitudes, spatial QRS-T, RRⲠand TTⲠangles, RRⲠand QT intervals, and QRS- and T-loop roundness were measured on 453 consecutive sinus beats in 168 healthy subjects (mean age 39.8 ± 15.6 years; 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.ResultsIncrease 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 TTⲠangle. One unit increase in a respiration index was associated with 4 ms (95%CI 0.6-7.0; P = 0.021) increase in QT interval.ConclusionsSpatial TTⲠangle 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.
Journal: Journal of Electrocardiology - Volume 49, Issue 3, MayâJune 2016, Pages 417-422