Synchronization of low-frequency oscillations in the human cardiovascular system

Karavaev, Anatoly S.; Прохоров, М. Д.; Ponomarenko, V. I.; Kiselev, Anton R.; Gridnev, Vladimir I.; Ruban, E. I.; Безручко, Б. П.

doi:10.1063/1.3187794

Cited by 96 publications

(106 citation statements)

References 35 publications

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“…These indices can assess cardiac autonomic regulation but not peripheral blood flow. In our previous papers, we have proposed an original method for the assessment of cardiovascular autonomic control based on synchronization between the 0.1-Hz rhythms in heart rate (HR) and photoplethysmogram (PPG) (21). The quality of 0.1-Hz rhythms synchronization was found to be higher in healthy subjects than in patients with cardiovascular disease (22).…”

Section: Methodsmentioning

confidence: 99%

“…Very-lowfrequency range of HRV was not included in our analysis to avoid questionable results, because we registered short-time ECG records (2). To estimate synchronization between the 0.1-Hz rhythms in HR and PPG, we used the method proposed by us recently (21). Index S defines the relative time of synchronization between the 0.1-Hz rhythms considered.…”

Section: Signal Processingmentioning

confidence: 99%

See 1 more Smart Citation

Autonomic control of cardiovascular system in pre- and postmenopausal women: a cross-sectional study

Neufeld¹,

Kiselev²,

Karavaev³

et al. 2015

J Turkish German Gynecol Assoc

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Original Investigation 11Autonomic control in CVS can be assessed by HRV analysis.Various time domain and frequency domain indices are usually used for this purpose (2). The physiological explanation of these indices is known (2,19,20). These indices can assess cardiac autonomic regulation but not peripheral blood flow. In our previous papers, we have proposed an original method for the assessment of cardiovascular autonomic control based on synchronization between the 0.1-Hz rhythms in heart rate (HR) and photoplethysmogram (PPG) (21). The quality of 0.1-Hz rhythms synchronization was found to be higher in healthy subjects than in patients with cardiovascular disease (22). From a physiological viewpoint, the synchronization of 0.1-Hz rhythms is the result of adequate functional interaction of CVS parts (heart and peripheral vessels). The clinical importance of this diagnostic method is shown for patients with prior myocardial infarction, patients with acute coronary syndrome, and hypertensive patients (3,23). The physiological explanation of 0.1-Hz rhythms in PPG is a debatable point. An opto-physiological model of a finger in conjunction with a near-infrared reflectance PPG device has been proposed (24). It was shown that both oscillations in the microcirculatory bed and blood filling of digital arteries make a substantial contribution to the PPG signal. Therefore, 0.1-Hz oscillations in PPG may be associated directly with baroreceptor regulation of blood pressure (BP). At the same time, a number of authors assume that 0.1-Hz oscillations in blood microcirculation are not associated with autonomic regulation (25)(26)(27)(28). To avoid confusion, we do not interpret the origin of 0.1-Hz oscillations in PPG in the present paper. Thus, the features of cardiovascular autonomic control in women before and after menopause are not fully understood. Controversial results concerning this problem have been reported. The aim of the present study cross-sectional study is to assess the features of autonomic control of CVS in pre-and postmenopausal women. Material and Methods PatientsThe study was approved by the ethics committee of the Saratov Research Institute of Cardiology in Saratov, Russia (no. 24, Sept. 12, 2013) and informed consent was obtained from all participants. Our cross-sectional study included 185 postmenopausal women aged 59.3±8.5 years (mean±SD) and 104 premenopausal women aged 45.1±5.8 years. Both groups were investigated and treated, if necessary, in the clinic of Saratov State Medical University (Saratov, Russia). Clinical characteristics (cardiovascular, gynecological, etc.) were assessed in all women. We assessed the level of the following sex hormones: estradiol, follicle-stimulating hormone (FSH), dehydroepiandrosterone sulfate (DHEAS), and testosterone. Only patients aged between 35 and 70 years were enrolled in our study. Women with CVD were not on beta-blockers or calcium channel blockers during the 7 days before the start of the study.Patients were not included in our study if they ...

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Section: Methodsmentioning

confidence: 99%

Section: Signal Processingmentioning

confidence: 99%

Autonomic control of cardiovascular system in pre- and postmenopausal women: a cross-sectional study

Neufeld¹,

Kiselev²,

Karavaev³

et al. 2015

J Turkish German Gynecol Assoc

View full text Add to dashboard Cite

show abstract

“…To estimate synchronization between the 0.1-Hz rhythms in HR and PPG we used the method proposed by us recently (10,19). Index S defines the relative time of synchronization between the considered 0.1-Hz rhythms.…”

Section: Hrv and Ppgmentioning

confidence: 99%

“…The 0.1-Hz rhythm in HR is an estimate of combined vagal and β-sympathetic activity (17), whereas the 0.1-Hz rhythm in peripheral BP is an estimate of α-sympathetic activity (18). It has been found that 0.1-Hz rhythms can be synchronized between themselves (10,12,19). From physiological viewpoint, the synchronization of 0.1-Hz rhythms is the result of adequate functional interaction of CVS parts.…”

Section: Introductionmentioning

confidence: 99%

Effects of antihypertensive treatment on cardiovascular autonomic control: a prospective study

Kiselev¹,

Gridnev²,

Прохоров³

et al. 2014

Anadolu Kardiyol Derg

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Objective: The aim of study was to propose an approach to the control of dynamics of autonomic dysfunction in cardiovascular system (CVS) under antihypertensive treatment (AT) in patients with arterial hypertension (AH), based on individual features of synchronization of 0.1-Hz rhythms in heart rate (HR) and photoplethysmogram (PPG) and spectral indices of heart rate variability (HRV). Methods: We designed prospective cohort diagnostic accuracy and studied 105 AH patients (66 females) aged 47±8 years during 8 weeks. The HRV spectral indices and the index S of synchronization between the 0.1-Hz rhythms in HR and PPG during a tilt test are compared in their ability to control the AT with angiotensin-converting enzyme inhibitors (ACE-Is) (fosinopril or enalapril) and β-blockers (atenolol or metoprolol). We apply Shapiro-Wilk, Mann-Whitney U and Wilcoxon tests. Results: It is shown that the power of low-frequency (LF) band in HRV spectrum and index S can be used as criteria for initial assessment of the status of autonomic regulation in AH patients. The patients with S<25% in vertical body's position and LF>250 ms 2 in horizontal body's position require ACE-Is treatment. The AH patients with LF<350 ms 2 and S<30% in vertical body's position require β-blocker treatment. The AH patients with S>25% and LF>250 ms 2 in horizontal body's position do not require any ACE-Is or β-blocker treatment. Both drug groups can be used in patients with low values of index S and low power of LF band in HRV spectrum. Conclusion: The control of AT can be carried out in AH patients taking into account the individual features of autonomic dysfunction in CVS. Sensitivity and specificity of our approach were 65% and 73%, respectively. (Anadolu Kardiyol Derg 2014; 14: 701-10)

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“…Было показано, что эти контуры демонстрируют длительные (десятки характерных периодов) участки фазовой синхронизации [31]. Был предложен метод расчета индекса S для оценки удельного времени синхронного поведения этих контуров [11,28] и показана значимость индекса S для медицинской диагностики патологий сердечно-сосудистой системы, выбора медикаментозной терапии инфаркта миокарда и гипертонической болезни, прогноза ослож-нений и риска смерти пациентов кардиологического профиля [16].…”

Section: Introductionunclassified

Phase synchronization of elements of autonomic control in mathematical model of cardiovascular system

et al. 2017

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Synchronization of low-frequency oscillations in the human cardiovascular system

Cited by 96 publications

References 35 publications

Autonomic control of cardiovascular system in pre- and postmenopausal women: a cross-sectional study

Autonomic control of cardiovascular system in pre- and postmenopausal women: a cross-sectional study

Effects of antihypertensive treatment on cardiovascular autonomic control: a prospective study

Phase synchronization of elements of autonomic control in mathematical model of cardiovascular system

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