ANALYSIS OF STATISTICAL INDICATORS OF HEARTRATE VARIABILITY AND ECG SIGNAL VARIABILITY NORMALLY AND WITH SIGNS OF ARRHYTHMIA

Background. Calculation and comparative analysis of heart rate variability and variability parameters is an urgent task of classification of arrhythmic and normal ECG signals. The objective is a comparative analysis of statistical indicators of heart rate variability and ECG signal variability by two methods and assessment of differences in parameters for different types of signal. Materials and methods. Two groups of signals from the open PhysioNet database were selected as initial data: those obtained from healthy people and those with arrhythmic disorders. For these signals, histograms of the probability density distribution of their amplitude characteristics and relative increments of a number of cardiointervals were constructed. The areas of mismatch of the histograms were calculated as metrics of their difference. Results. An assessment was made of the difference in the indicators of ECG signal variability and heart rate variability based on the averaged histograms of the distributions of ECG signal values for each group and the calculation of the ratio of the area of the mismatch region to the total area of the histogram, while the ratio for the first method was 48 %, and for the second – from 33 to 38 % for various indicators. Conclusions. The obtained data show the potential applicability of both methods for analyzing ECG signals for signs of arrhythmia.