“…Its simultaneously records the heart rate, rhythms of systolic and diastolic pressure at each heartbeat and respiratory rhythms, which provides significant time savings to determine the functional state of the heart, vessels and respiration, as well as identifies the important parameters of their interaction [23]. ECG recording in 1 lead allowed to determine the indicators of heart rate variability (HRV) according to the spectral analysis of the sequence of RR intervals is total power (ТР, ms 2 ), power in the very low frequency range (VLF, ms 2 ), power in the low frequency range (LF, ms 2 ) and power in the high frequency range (HF, ms 2 ) and their derivatives (LFn, n.u., HFn, n.u., LF/HF) [24][25][26]; according to cardiointervalometry it is possiple to define the heart rate (HR, min -1 ), durations and intervals of PQRST-complex -P (s), PQ (s), QRS (s), QT (s), QTC (s), ST (n.u. ); indicators of systemic hemodynamics [27][28][29] end-diastolic volume (EDV, cm 3 ), end-systolic volume (ESV, cm 3 ), stroke volume (SV, cm 3 ), cardiac output (CO, dm 3 ), stroke index (SI, cm 3 /m 2 ), cardiac index (CI, dm 3 /m 2 ), general peripheral vascular resistance (GPVR, dyn/s/cm −5 ).…”