CLINICAL SIGNIFICANCE OF NON-LINEAR PARAMETERS OF THE HEART RATE VARIABILITY IN PATIENTS WITH CARDIOVASCULAR DISEASES

Heart rate variability (HRV) is understood as the severity of fluctuations in heart rate or RR-intervals in relation to their average values. HRV is defined as the actual variability of the duration of the RR-intervals between consistent heart contraction cycles for a certain period of time. Traditional methods for analyzing heart rate variability are often insufficient to characterize the complex heartbeat dynamics, since the mechanisms involved in the regulation of the cardiovascular system are likely to interact with each other in a non-linear manner. The article represents data on the association between non-linear parameters of heart rate variability in patients with cardiovascular diseases. It can be concluded, that the non-linear analysis of HRV provides useful information for characterizing the autonomic balance and is a reliable marker of complications and mortality in patients with cardiovascular diseases.