Electrophysiological indications of variational pulsometry of horses of the Republic of Sakha (Yakutia)

Objective: to analyze variation pulse patterns using mathematical analysis of electrocardiograms.

Materials and Methods. Electrocardiogram (ECG) and heart rate variability (HRV) parameters were studied in horses. The CONAN–4.5 software was used to analyze and record ECGs in the study animals. Clinical examination methods were based on B.V. Usha's clinical examination methods for animals and included inspection, palpation, percussion, and auscultation of the cardiac region.

Results. Based on the conducted studies, the following primary parameters of variation pulse pattern analysis were established during ECG analysis of horses: mode — 1,57±0,13 sec, mode amplitude — 43,63±3,19 %, variation range — 1,04±0,21 sec. Secondary indicators: index of regulatory systems tension of the body — 22,38±3,01 c.u., RMMSSD – 308.65±20.61 ms, pNN50 – 41.88±3.62%, index of vegetative balance — 35.75±9.39 c.u., vegetative rhythm indicator — 0,88±0,22 c.u., indicator of adequacy of regulatory processes — 23,51±2,16 c.u. Kaplan indicators – respiratory modulation index (RMI) — 9,51±2,56 %, index of sympathoadrenal tone — 62,01±3,83 %, index of slow-wave arrhythmia — 19,01±3,42. The cardiac stress index was 15,77±2,31 %, the cardiac arrhythmia index was 5,18±0,61 %. As a result of the conducted studies of the classical ECG analysis, the following average values ​​were obtained: P wave — 0,171±0,054 mV; Q wave — 0,212±0,071 mV; R wave — 0,275±0,104 mV; S wave — 0,424±0,153 mV; T wave — 0,140±0,038 mV. The duration of the R–R interval in horses is on average 1,558±0,131 ms and varies from 1,156 to 1,876 ms; the P–Q interval varies from 0,096 to 0,152 ms; The Q–T interval varies from 0,296 to 0,640 ms; the QRS complex varies from 0,022 to 0,064 ms.

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