Assessment of functional stability of CHD patients by stress tests according to the nonlinear analysis of heart rate

Abstract

The article presents the data on systemic homokinesis shifts developed in 120 CHD patients during stress-testing and indentified by the аnalysis of non-linear dynamics pecularities of cardiointervalogram and their relative entropy. Both dynamic processes were presented in a form of attractors whose topology reflects current regulatory processes activity. The method for analyzing the internal structure of the dynamic processes studied in a form of the chaotic degree coefficient was proposed. Maximal variety of topological effects against the background of the physical activity and induced myocardial ischemia was observed in the analysis of non-linear dynamics of relative entropy. The findings open up the possibility of both quantitative and qualitative, casual diagnostics of the stress effects on the functioning organism.