Wavelet analysis of phase synchronization destruction in nocturnal EEG and ECG recordings in patients with apnea and healthy volunteers

Abstract

The chaotic synchronization is a fundamental phenomenon of nature that has been observed in many objects in both nature and technology.
Ten subjects, 7 women and 3 men, participated in our work. The study protocol was approved by the Ethics Committee of the Saratov State Medical University of the Ministry of Health of Russia, and all experimental procedures were performed in accordance with the ethical standards laid down in the Declaration of Helsinki. All subjects were informed about the experimental procedures in details and have signed standard consent forms. Electroencephalography (EEG) and electrocardiography (ECG) signals were used for numerical analysis. The concept of time scale synchronization is based on the introduction of a continuous set of phases of studied signals of connected chaotic systems by means of continuous wavelet transformation of time realization.
Based on this concept of time scale synchronization, we consider intermittent dynamics for EEG and ECG signals during nocturnal sleep in both healthy participants and patients suffering from sleep apnea. The studies performed demonstrate the relationship between the characteristics of the duration of laminar (synchronous) ECG and EEG states with the pulse pressure of patients. In addition, the presence of the eyelet intermittency indicates the unidirectionality of the connection between the signals ECG and EEG. In this case, the electrocardiogram is a recording of the leading system, and the electroencephalogram is a recording of the slave system.
The study was carried out within the state task of the Ministry of Health of the Russian Federation # 056-03-2024-071.

Speaker

Elizaveta Emelyanova
Saratov State Medical University
Russia

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