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7th Scientific School: dynamics of Complex Networks and their Applications, DCNA 2023

作者： Skazkina, Viktoriia Popov, Konstantin Karavaev, Anatoly Saratov State University Department of Dynamic Modeling and Biomedical Engineering Saratov Russia Saratov State Medical University Faculty Therapy Chair Saratov Russia

ISBN: (纸本)9798350305746

The work aims to explore the possibility of using cross-recurrence quantification analysis of low-frequency signals of photoplethysmogram and RR-intervals to assess the condition of patients with Covid-19. We used estimates of synchronization of the control contours of the cardiovascular system in patients in the acute phase and a week since the start of treatment. The results obtained were compared with those published earlier and made it possible to choose a more sensitive method of analysis. © 2023 IEEE.

关键词： Nonlinear analysis

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dynamics of connections between autonomic regulatory circuits of the cardiovascular system in patients with Covid-19 6

Dynamics of connections between autonomic regulatory circuit...

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6th Scientific School "dynamics of Complex Networks and their Applications", DCNA 2022

作者： Skazkina, Viktoriia Popov, Konstantin Kurbako, Aleksandr Saratov State University Department of Dynamic Modeling and Biomedical Engineering Saratov Russia Saratov State Medical University Faculty Therapy Chair Saratov Russia

ISBN: (数字)9781665461740

ISBN: (纸本)9781665461740

The work aims to study the dynamics of connections between the circuits of the autonomic regulation of blood circulation in patients with Covid-19. The tools for the study are methods of nonlinear analysis. The work shows dynamics of the degree of phase synchronization between 0.1-Hz components of the RR-interval signals and the photoplethysmogram, and no visible change in the direction of connections. © 2022 IEEE.

关键词： Cardiovascular system

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Mathematical modeling of nonlinear dynamics of the cardiovascular system under different physiological conditions 5

Mathematical modeling of nonlinear dynamics of the cardiovas...

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5th Scientific School on dynamics of Complex Networks and their Applications, DCNA 2021

作者： Ishbulatov, Yurii M. Karavaev, Anatoly S. Ponomarenko, Vladimir I. Prokhorov, Mikhail D. Kiselev, Anton R. Bezruchko, Boris P. Laboratory of Nonlinear Dynamics Modelling Saratov Branch of the Institute of RadioEngineering and Electronics of Russian Academy of Sciences Department of Innovative Cardiological Information Technology Institute of Cardiological Research Saratov State Medical University Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia Laboratory of Nonlinear Dynamics Modelling Saratov Branch of the Institute of RadioEngineering and Electronics of Russian Academy of Sciences Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia Laboratory of Nonlinear Dynamics Modeling Saratov Branch of the Institute of Radio Engineering and Electronics of Russian Academy of Sciences Saratov Russia Department of Innovative Cardiological Information Technology Institute of Cardiological Research Saratov State Medical University Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia

ISBN: (纸本)9781665442824

Nonlinear dynamics of the cardiovascular system under various physiological conditions is still largely not understood, especially the coupling between the elements of autonomic control and respiration. Under normal, healthy conditions the loops of the autonomic control of the heart rate exhibit intervals of coupled and uncoupled behavior, and during the tests with linearly increasing frequency of respiration, we observed coupling between the respiratory signal and the low-frequency rhythms in the RR-intervals signal associated with the autonomic control of the heart rate. Some researchers theorize that the perceived coupling is due to the presence of the same driving rhythm, which originates from the brain or respiratory system, respectively. Other theory suggest that the observed coupling is based on the phase synchronization between the loops of autonomic control. We applied mathematical modeling to investigate this problem, qualitative and quantitative agreement of the model with the experimental data, suggest that the cardiovascular and cardiorespiratory coupling is based on phase synchronization. © 2021 IEEE

关键词： dynamics

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Mean phase coherence modified for piecewise constant phase difference data 3

Mean phase coherence modified for piecewise constant phase d...

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3rd School on dynamics of Complex Networks and their Application in Intellectual Robotics, DCNAIR 2019

作者： Khorev, Vladimir Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia Neuroscience and Cognitive Technology Lab Center for Technologies in Robotics and Mechatronics Components Innopolis University Innopolis Russia

We propose a modification of the mean phase coherence method based on the statistics arrange of phase difference data. The modification aimed towards better analysis of data of coupled oscillators under influence of s... 详细信息

ISBN: (纸本)9781728124704

关键词： Synchronization Coherence Oscillators Couplings Indexes Time series analysis Delays

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Reconstructions of model equations of time-delay system from short experimental time series

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International Journal of modeling, Simulation, and Scientific Computing 2020年第2期11卷 91-99页

作者： Anatoly S.Karavaev Yurii M.Ishbulatov Ekaterina I.Borovkova Danil D.Kulminskiy Vladimir S.Khorev Anton R.Kiselev Vladimir I.Ponomarenko Vladimir I.Gridnev Mikhail D.Prokhorov Boris P.Bezruchko Department of Dynamic Modeling and Biomedical Engineering Saratov State University 83 Astrakhanskaya Street Saratov410012Russia Laboratory of Nonlinear Dynamics Modeling Saratov Branch of the Institute of Radio Engineering and Electronics of Russian Academy of Sciences 38 Zelyonaya Street Saratov410019Russia Department of New Cardiological Informational Technologies Institute of Cardiological Research Saratov State Medical University 112 Bolshaya Kazachaya StreetSaratov410012Russia

This study aims to investigate the scope of methods for the reconstruction of time-delay *** consider an approach to the reconstruction of time-delay systems based on the synchronous response of the driven system with the structure similar to the structure of the studied *** approach is used for the recovery of the parameters of timedelay systems from short and noisy time *** show the operational performance and capabilities of this approach,the parameters were reconstructed for a radiophysical chaotic generator with quadratic nonlinearity and for the model of a system for the baroreflectory regulation of the mean arterial pressure.

关键词： Time-delay systems reconstruction chaos radiophysical experiment

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Analysis of phase synchronization of circuits of autonomic regulation of blood circulation in patients with ovid-19 and other comorbidities 7

Analysis of phase synchronization of circuits of autonomic r...

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7th Scientific School: dynamics of Complex Networks and their Applications, DCNA 2023

作者： Skazkina, Viktoriia Popov, Konstantin Krasikova, Natalia Kuligin, Alexander Kiselev, Anton Karavaev, Anatoly Saratov State University Department of Dynamic Modeling and Biomedical Engineering Saratov Russia Saratov State Medical University Faculty Therapy Chair Saratov Russia Saratov State Medical University Department of Emergency Emergency and Anesthetic and Resuscitation Care Saratov Russia Saratov State Medical University Saratov Russia Saratov State Medical University Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia National Medical Research Center for Therapy and Preventive Medicine Moscow Russia

ISBN: (纸本)9798350305746

The work aims to study the degree of phase synchronization of the regulatory mechanisms of circulation in patients with Covid-19 (with and without comorbidities). Arterial hypertension, obesity, diabetes mellitus were considered as comorbidities. A significant decrease in the degree of synchronization has been shown in patients with Covid-19 and other comorbidities. © 2023 IEEE.

关键词： Synchronization

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Development of Hardware-Software Complex for Detecting a Stress State in Real Time from EEG Signals 7

Development of Hardware-Software Complex for Detecting a Str...

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7th Scientific School: dynamics of Complex Networks and their Applications, DCNA 2023

作者： Kurbako, Aleksander V. Borovkova, Ekaterina I. Hramkov, Aleksey N. Karavaev, Anatoly S. Ponomarenko, Vladimir I. Prokhorov, Mikhail D. Saratov Branch of the Institute of Radio Engineering and Electronics of Russian Academy of Science Laboratory of Nonlinear Dynamics Modelling Saratov Russia Immanuel Kant Baltic Federal University Saratov Russia Saratov State University Department of Dynamic Modeling and Biomedical Engineering Saratov Russia

ISBN: (纸本)9798350305746

We have developed an eight-channel device for recording electroencephalogram signals in a wide frequency range including low-frequency oscillations. The signals simultaneously recorded by the developed device and serial recorder have been compared. We have proposed and implemented a method for detecting a stress state in real time. The method is based on the analysis of electroencephalogram signal power spectrum in the range from 0.15 to 0.4 Hz. © 2023 IEEE.

关键词： Electroencephalography

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Change in the directional coupling between the heart beat and respiration during the Stroop test and mental arithmetic test 7

Change in the directional coupling between the heart beat an...

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7th Scientific School: dynamics of Complex Networks and their Applications, DCNA 2023

作者： Hramkov, Aleksey N. Borovkova, Ekaterina I. Dubinkina, Elizaveta S. Ponomarenko, Vladimir I. Plekhanova, Sofia O. Prokhorov, Mikhail D. Saratov State University Saratov Russia Immanuel Kant Baltic Federal University Kaliningrad Russia Saratov Branch of the Institute of Radio Engineering and Electronics of Russian Academy of Sciences Saratov Russia Saratov State University Department of Dynamic Modeling and Biomedical Engineering Saratov Russia

ISBN: (纸本)9798350305746

Purpose of the work is to study the influence of cognitive tasks on the interaction between the processes of autonomic regulation of the cardiovascular system and respiration. The low-frequency components (0.05-0.15 Hz) of the time intervals between heart contractions and photoplethysmogram signals were analyzed using a sensitive method for detecting directional coupling based on modeling the dynamics of instantaneous phases of oscillations. It was shown that the coupling coefficients in the frequency band of 0.05-0.15 Hz (associated mainly with the sympathetic regulation of blood circulation) decrease during the execution of the Stroop test and the mental arithmetic test. It has also been shown that the interaction of airflow signals and interbeat interval is reduced during the execution of a mental arithmetic test The results obtained allow us to better understand the features of the interaction of the elements of the autonomic regulation of blood circulation. © 2023 IEEE.

关键词： Heart

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Analysis of coupling between autonomic control loops of blood circulation in patients with Covid-19 5

Analysis of coupling between autonomic control loops of bloo...

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5th Scientific School on dynamics of Complex Networks and their Applications, DCNA 2021

作者： Skazkina, Viktoriia Borovkova, Ekaterina Krasikova, Natalia Kiselev, Anton Gorshkov, Alexander Korolev, Andrey Dadaeva, Valida Fedorovich, Andrey Kuligin, Alexander Karavaev, Anatoly Department of dynamic modeling and biomedical engineering Saratov State University Saratov Russia Laboratory of Nonlinear Dynamics Modelling Saratov Branch of the Institute of RadioEngineering and Electronics of Russian Academy of Sciences Department of Innovative Cardiological Information Technology Institute of Cardiological Research Saratov State Medical University Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia Department of Emergency Emergency and Anesthetic and Resuscitation Care Saratov State Medical University Saratov Russia National Medical Research Center for Therapy and Preventive Medicine Moscow Russia Saratov State Medical University Saratov Russia

ISBN: (纸本)9781665442824

This work aims to analyze the coupling between autonomic control loops of blood circulation in patients with Covid-19. In this work, we assessed the degree of coupling between the mechanisms of autonomic control using noninvasive signals of the cardiovascular system - RR-intervals signals and photoplethysmogram signals. Statistical evaluation of the study results using the methods of phase synchronization analysis did not reveal significant differences between the sample of patients with Covid-19 and healthy subjects of the corresponding age group. © 2021 IEEE

关键词： Blood

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Modification of real-time method for diagnostics of synchronization between the autonomic control loops 5

Modification of real-time method for diagnostics of synchron...

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5th Scientific School on dynamics of Complex Networks and their Applications, DCNA 2021

作者： Kurbako, Aleksander V. Kulminsky, Danil D. Borovkova, Ekaterina I. Kiselev, Anton R. Skazkina, Victoria V. Ponomarenko, Vladimir I. Bezruchko, Boris P. Karavaev, Anatoly S. Laboratory of Nonlinear Dynamics Modelling Saratov Branch of the Institute of RadioEngineering and Electronics of Russian Academy of Science Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia Laboratory of Nonlinear Dynamics Modelling Saratov Branch of the Institute of RadioEngineering and Electronics of Russian Academy of Science Department of Innovative Cardiological Information Technology Institute of Cardiological Research Saratov State Medical University Saratov Russia Department of Innovative Cardiological Information Technology Institute of Cardiological Research Saratov State Medical University Department of Dynamic Modeling and Biomedical Engineering Saratov State University Saratov Russia

ISBN: (纸本)9781665442824

We modified the method for diagnosing the intervals of phase synchronization of the autonomic control loops of the cardiovascular system, based on averaging the values of the instantaneous phase difference in sliding windows. A comparison of the sensitivity values of the modified method, the previously developed method and the known method based on linear approximation of the instantaneous phase difference in sliding windows was conducted. The computational complexity of the methods under consideration was also compared. Comparison showed that the modified method shows sensitivity values close to the known method and is a computationally simpler method. © 2021 IEEE

关键词： Cardiovascular system

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