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Results of heart rate variability analysis depend on the quality of the initial RR time series that is measured only
in one lead of the ECG. This work shows that RR time series can subtly change from lead to lead so the choice of the analyzed lead is another source of uncertainty. The standard deviation of the differences of two RR time series obtained from different leads can change from 0.5 ms to more than 20 ms
depending on the amount of noise, the morphological changes of the QRS complexes, the strategies of fiducial point determination and the measured subject. This source of uncertainty is in healthy subjects greater than that associated to the sampling frequency of the ECG for sampling frequencies greater than 400 Hz.
CitationGarcia, M.; Ramos, J.; Fernandez, M. The Effect of Electrocardiographic Lead Choice on RR Time Series. A: IEEE Engineering in Medicine and Biology Society. "Proceedings of the 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society". Boston: 2011, p. 1933-1936.
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