The purpose of this study is to examine the differences in the response of patients with cardiovascular disease to the passive tilt test stress situation compared to the control group. To explore the potential of this test as an early diagnostic tool and a method for confirming the diagnosis.

Methods. In this study, recurrence indices are calculated to analyze patients’ responses to stress. Pre- and post-tilt test indices will be compared, and joint recurrence indices between these two conditions will be calculated for each patient.

Results. It has been shown that comparing recurrence indices before and after tilt test rotation, depending on the time interval under consideration, allows for the identification of clear differences between patients with various cardiovascular diseases and the control group.

Conclusion. Nonlinear processing of a complex of physiological signals from patients in horizontal and vertical positions allows us to distinguish between sets of recurrent and joint recurrent parameters in groups of patients suffering from arterial hypertension and coronary heart disease, and apparently healthy
volunteers. The analysis revealed differences in the response of patients in different groups to tilt testing, which can be used in the future for the early detection of cardiovascular pathologies and the refinement of diagnostic mechanisms.