Heart Rate Variability: for real doctors. Interpretation of HRV indicators. Time domain indicators

Yabluchansky N.I., Martynenko A.V.

Heart rate variability: for real doctors. Translation from the Russian version of the book, published at Kharkiv, 2010, 131 p.
The basics and practice of the clinical use of the technology of heart rate variability are outlined for doctors of all specialties and students of medical faculties of universities.

Time domain indicators

It is better to analyze scattergrams and the probability distribution of RR (NN) -intervals in the assessment of regulation. If the distribution of RR (NN) -intervals is monomodal and narrow – the heart rate is metronomic, the regulation power is low. On the contrary, if the distribution of RR (NN) -intervals is extensive, there is a high rhythm variability and power of regulation. If the distribution is monomodal asymmetrical with the mode on the left – higher frequencies prevail – the influence of higher frequencies of control (more significant impact of the parasympathetic level). If the distribution is monomodal asymmetrical with the mode on the right – lower frequencies prevail – the influence of lower frequencies of regulation (more significant impact of the sympathetic and humoral links). If the distribution is multimodal (more than one maximum), there are extrasystoles or competing sources of heart rhythm.
The more stretched the scattergram, the more high frequencies in HRV, the greater the effect of fast regulation, the less elongated, the less high frequencies in HRV, the less influence fast regulation. With competing rhythms of different frequencies, more than one cloud of the scattergram is identified along its bisectrix, and points outside the main cloud are the result of extrasystoles, and by their placement one can determine the number of types of such arrhythmias and their frequency ratios (more frequent and rarer rhythms extrasystoles).

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