Electrophysiological indicators of heart rate variability in deer of Republic of Sakha (Yakutia)

The article presents original research and for the first time conducted analysis of variation pulsograms by the method of mathematical analysis of heart rate variability of electrocardiogram and correlation analysis. On this basis, breed characteristics of Evenki reindeer of the Republic of Sakha (Yakutia) were established. For analysis and recording of ECG in the Evenki reindeer under study, the program "CONAN-4.5" was used in the system of frontal leads according to the method of M. P. Roshchevsky. Clinical research were carried out according to the methods of clinical examination of animals by B. V. Usha and included examination, palpation, percussion and auscultation of the cardiac region. Based on the conducted studies during the analysis of elec- trocardiograms of Evenki reindeer, the following features of the primary indicators of variational pulsometry were established: mode – 1.01±0.048 sec; mode amplitude – 28.00±2.84%; variation range – 0.683±0.07 sec; index of stress of the body's regulatory systems – 21.75±2.34 conven- tional units; heart rate – 56.13±2.37 beats/min. Secondary indicators of variation pulsometry are determined and analyzed: square root of the sum of differences in a consecutive series of cardio- intervals – 180.81±29.88 ms; the number of pairs of cardiointervals with a difference of more than 50 ms in percent of the total number of cardiointervals in the array – 63.29±4.83%; autonomic equilibrium index – 43.25±5.58 conventional units; autonomic rhythm indicator – 1.75±0.16 con- ventional units; regulatory process adequacy index – 27.88±2.64 conventional units. A. Ya. Ka- plan’s indices were evaluated: respiratory modulation index – 8.21±1.16; sympathoadrenal tone index – 40.88±9.11; slow-wave arrhythmia index – 9.78±3.04; cardiac stress index – 10.30±1.72% and cardiac arrhythmia index – 2.81±0.69%.