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Example of a 5-minute ECG recording: RR, QTe (from the Q wave to the T wave end), QTp (from the Q wave to the T wave peak), and Te (difference between QTe and QTp) intervals and relative variability indexes: SDNN, QTeVI, QTpVI, and TeVI.
Abbreviations: ECG, electrocardiogram; SDNN, standard deviation of all R-R intervals.
