Heart rate variability and ECG dispersion mapping in Magadan adolescents with a sympathetic type of vegetative regulation

Abstract

Aim . To determine the dispersion deviations of low-amplitude oscillations of the cardiac cycle in Magadan adolescents with different levels of activity of the sympathetic link of autonomic regulation (according to the heart rate variability — HRV). Material and methods . We analyzed ratios of HRV and ECG dispersion mapping (DM ECG) of the heart among male volunteers aged 15-17 years. The initial activity level of their autonomic nervous system (ANS) was characterized by sympathetic orientation (60 of 260 people): moderate — group 1 (n=43) and pronounced — group 2 (n=17), respectively. Results . When comparing the indices of HRV with the averaged DM ECG values for the “Rhythm” characteristic in group 2, the range of University, Magadan; 3Magadan regional center of medical prevention, values corresponded to 24-62% (normal — 20%), significantly exceeding the values characteristic for group 1 (14-37%). The values of the integral indicator “Myocardium” in both groups approached the upper limit of normal (15-17%). The greatest number of non-zero values indicating similarities with the standards of pathology was observed in terms of G1-G2 and G9. The values of G1 and G2 indicators in both groups of volunteers were comparable and, on average, did not exceed 6 relative units, while the range of fluctuations of the G9indicator in the first group was within 4 relative units, and in the second group — 7 relative units, respectively. Conclusion . In groups with moderate and elevated levels of central regulatory contour influence on the heart rhythm, ECG DM indicators showed the same type of similarity with the pathology standards in atrial depolarization processes at different types of potential localization causing it (G1 — G2). However, with pronounced centralization, deviations of the cardiac rhythm and dispersion characteristics from the norm were more often observed, similarities were found in the increased variations in the velocity characteristics of the initial ventricular depolarization front (G9), which is an unfavorable prognostic sign.