Saratov JOURNAL of Medical and Scientific Research

cardiovascular system

Synchronization of low-frequency rhythms in electroencephalogram by respiration with linear dependent time frequency.

Year: 2016, volume 12 Issue: №4 Pages: 541-548
Heading: Physiology and Pathophysiology Article type: Original article
Authors: Karavaev A.S., Runnova A.E., Borovkova E.l., Ishbulatov Y.M., Khorev V.S., Kiselev A.R., Zhuravlev M.O., Ponomarenko V.I., Prokhorov M.D., Bezruchko B.P., Koronovsky A.A..
Organization: Saratov Branch of Institute of Radio Engineering and Electronics n.a. V.A. Kotelnikov, Saratov State Medical University, Saratov state university
Summary:

The aim of the present study was to investigate the features of interaction of low-frequency rhythms in delta band of electroencephalogram (EEG) and processes in vegetative regulation of circulation with respiration. Materials and methods. 19 leads of EEG, photoplethysmogram (PPG) and respiration were simultaneously recorded in four healthy males (19-25 years old) during 30 minutes physiological test with linearly increasing frequency of respiration. Modern methods of nonlinear dynamics were used to diagnose the presence of phase and frequency synchronization between respiration and low-frequency rhythms in delta band of EEG and in PPG. Results. We found significantly long sections of synchronization of delta rhythms in cervical leads of EEG and low-frequency rhythms in PPG by respiration with linearly increasing frequency. Conclusion. Obtained results correlate well with established hypothesis which suggest that low-frequency rhythms in baroreflectory regulation of circulation are in complex dynamic relationships with structures of brain stem. A method was proposed for quantitative evaluation of synchronization strength between respiration and low-frequency rhythms in electrical brain activity in physiological tests with respiration with frequency linearly increasing in time.

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Investigation of statistical characteristics of interaction between the low-frequency oscillations in heart rate variability and peripheral microcirculation in healthy subjects and myocardial infarction patients

Year: 2015, volume 11 Issue: №4 Pages: 537-542
Heading: cardiac surgery Article type: Original article
Authors: Shvartz V.A., Karavaev A.S., Borovkova E.l., Mironov S.A., Ponomarenko V.I., Prokhorov M.D., Butenko A.A., Gridnev V.I., Kiselev A.R.
Organization: Saratov state university, Saratov Institute of Cardiology, Russia, Saratov Branch of Institute of Radio Engineering and Electronics n.a. V.A. Kotelnikov, Bakulev Center of Cardiovascular Surgery
Summary:

Objective. This study compares the statistical characteristics of interaction between 0.1 Hz oscillations in heart rate variability (HRV) and photoplethysmogram (PPG) in healthy subjects and myocardial infarction (Ml) patients. Material and methods. We studied 23 healthy subjects (20 men and 3 women aged 26±3 years) and 23 patients (12 men and 11 women aged 52±4 years) at about one month after Ml. The 10-minute signals of simultaneously recorded cardioin-tervalogram (CIG) and PPG were studied. We calculated the total percentage of phase synchronization between the studied 0.1 Hz oscillations and estimated the distribution functions of duration of synchronous and non-synchronous epochs, the variability of basic frequency of oscillations, and variance of phase noises in 0.1 Hz oscillations in HRV and PPG. Results. The total percentage of phase synchronization between 0.1 Hz oscillations is significantly greater in healthy subjects than in Ml patients (47±3% and 26±4%, respectively). Significant difference between these two groups in the distribution of duration of synchronous and non-synchronous epochs was not revealed. The Ml patients had greater variance between the basic frequencies of 0.1 Hz oscillations in HRV and PPG than healthy subjects. This phenomenon correlates with the increased level of phase noises in the records of Ml patients. Conclusion. The quality of synchronization between 0.1 Hz oscillations in HRV and PPG is associated with the strength of influence of external factors (noises) and variability of the basic frequency of these oscillations.

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Method of synchronization assessment of rythms in regulatory systems for signal analysis in real time

Summary:

A method is proposed for quantitative assessment of the phase synchronization of 0.1 Hz oscillations in autonomic cardiovascular control by photoplethysmogram analysis in real time. The efficiency of the method is shown in the comparison with the results obtained by the previously developed method.

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2014_03_390-395.pdf783.62 KB

State of cardiovascular system during exercise in sportsmen

Year: 2013, volume 9 Issue: №1 Pages: 64-68
Heading: Internal Diseases Article type: Original article
Authors: Usanov D.A., Protopopov А.А., SkripalA.V.,AveryanovA.P., Kashchavtsev Е.О.
Organization: Saratov State Medical University, Saratov state university
Summary:

The purpose of the article is to study the state of cardiovascular system of sportsmen involved in rowing and canoeing, both before and after training. Material et methods: The research has been performed by means of the developed mobile devices that allow non-invasive screening assessment of the potential risk of collapse complications. Results: The article outlines the results of the survey carried out to determine the presence of vagotonic tone with deficient activity supply and abnormal pulse wave that may lead to circulatory collapse in exercise. Conclusion: The technique of pulse wave and vegetative regulation assessment before and after training enables to prevent the circulatory collapse development in stressful physical exertion in sportsmen.

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Oscillatory processes in vegetative regulation of cardiovascular system (Review)

Year: 2011, volume 7 Issue: №1 Pages: 034-039
Heading: Physiology and Pathophysiology Article type: Review
Authors: Kiselev A.R., Gridnev V.I.
Organization: Saratov Institute of Cardiology, Russia
Summary:

The research work provides current understanding of the functional organization of vegetative regulation of cardiovascular system. The basic oscillatory processes in vegetative regulation system have been determined, and the information about their functional properties has been generalized. The most significant oscillatory processes are main heart rhythm, respiration and low-frequency oscillations in vegetative regulation of cardiovascular system. The article considers intersystem interactions involving the vegetative regulation of cardiovascular system

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