Frequency-Domain Features and Low-Frequency Synchronization of Photoplethysmographic Waveform Variability and Heart Rate Variability with Increasing Severity of Cardiovascular Diseases.

-Heart rate variability (HRV) and photoplethysmographic waveform variability (PPGV) are available approaches for assessing the state of cardiovascular autonomic regulation. The goal of our study was to compare the frequency-domain features and low-frequency (LF) synchronization of the PPGV and HRV with increasing severity of cardiovascular diseases. -Our study included 998 electrocardiogram (ECG) and finger photoplethysmogram (PPG) recordings from subjects, classified into five categories: 53 recordings from healthy subjects, aged 28.

Synchronization of the Processes of Autonomic Control of Blood Circulation in Humans Is Different in the Awake State and in Sleep Stages.

The influence of higher nervous activity on the processes of autonomic control of the cardiovascular system and baroreflex regulation is of considerable interest, both for understanding the fundamental laws of the functioning of the human body and for developing methods for diagnostics and treatment of pathologies. The complexity of the analyzed systems limits the possibilities of research in this area and requires the development of new tools. Earlier we propose a method for studying the collective dynamics of the processes of autonomic control of blood circulation in the awake state and in different stages of sleep.

Application of the Appropriate Use Criteria for Coronary Revascularization in Patients with Acute Coronary Syndrome in the Russian Federation: Data from the Federal Registry.

Objective: The aim of the study was to apply the appropriate use criteria (AUC) for coronary revascularization on Russian Acute Coronary Syndrome Registry (RusACSR) data to analyze validity of the decision to perform percutaneous coronary interventions (PCIs) among patients with acute coronary syndrome (ACS).

Material And Methods: In Russia, the frequency of performing PCI increased almost 7.5 times, and more than half of all interventions were performed in patients with ACS, in the period from 2006 to 2015.

Low-frequency component of photoplethysmogram reflects the autonomic control of blood pressure.

The question of how much information the photoplethysmogram (PPG) signal contains on the autonomic regulation of blood pressure (BP) remains unsolved. This study aims to compare the low-frequency (LF) and high-frequency components of PPG and BP and assess their correlation with oscillations in interbeat (RR) intervals at similar frequencies. The PPG signal from the distal phalanx of the right index finger recorded using a reflective PPG sensor at green light, the BP signal from the left hand recorded using a Finometer, and RR intervals were analyzed.

Discrepancy between the European clinical guidelines and myocardial revascularization in patients with stable coronary artery disease in Russia.

Objective: In European Society of Cardiology/European Association for Cardio-Thoracic Surgery (ESC/EACTS) guidelines, six indications have been proposed for making a decision on myocardial revascularization in patients with stable coronary artery disease (CAD). Our aim was to study a discrepancy between the actual clinical situation and ESC/EACTS indications on performing the revascularization in patients with CAD in Russia.

Design And Setting: We used retrospective clinical data on patients with stable CAD enrolled in the 2012-2015 Russian Registry of Hypertension, Coronary Artery Disease, and Chronic Heart Failure.

Impact of Clinical Factors on the Achievement of Target Blood Pressure in Hypertensive Patients from Ivanovo Region of Russia: Data of 2015.

Introduction: In Russia, blood pressure (BP) control is below the optimal. The little is known about regional features and barriers to adequate BP control in Russian primary care.

Aim: To evaluate the impact of clinical factors on achieving the target BP in hypertensive patients in one region of Russia.

Model of Human Cardiovascular System Containing a Loop for the Autonomic Control of Mean Arterial Pressure.

We proposed a model of human cardiovascular system that describes the cardiac cycle, the autonomic regulation of heart and vessels, the baroreflex, and the formation of arterial pressure. The model also makes allowance for the influence of respiration on these processes. It was found that an allowance for nonlinearity and insertion of a loop for the autonomic control of mean arterial pressure (having the form of self oscillating time-delay system) enables to obtain model signals with statistical and spectral characteristics that are qualitatively and quantitatively similar to.

Ultrafast heating-induced magnetization switching in ferrimagnets.

We study theoretically the light-induced magnetization switching in a binary ferrimagnet of the type [Formula: see text], randomly occupied by two different species of magnetic ions. The localized spins are coupled with spins of itinerant electrons via s-d exchange interaction. Model parameters are chosen so that to achieve similarity between magnetic characteristics of the model and those of ferrimagnetic rare-earth-transition metal GdFeCo alloys.

Correlations Between Cardiovascular Autonomic Control Indices During the Two-hour Immobilization Test in Healthy Subjects.

Objective: The aim of the present study was to assess the features of dynamics of cardiovascular autonomic indices and correlations between them during the two-hour immobilization test in healthy subjects.

Methods: Photoplethysmogram (PPG) and electrocardiogram were recorded simultaneously during the two-hour immobilization test in 14 healthy subjects (5 men and 9 women) aged 29±5 years (mean±SD). Dynamics of heart rate variability (HRV) power spectrum in high-frequency and low-frequency ranges (in ms2 and percents of total spectral power), mean heart rate (HR), and index S of synchronization between 0.

Which Measures of Health Status Assessment are the Most Significant in Organized Cohorts with Low Current Cardiovascular Risk? The Screening Study of Penitentiary Staff in Saratov Region, Russia.

Objective: The aim of the present study was to compare different methods of health status assessment in organized cohort of penitentiary employees in Saratov Region, Russian Federation.

Materials And Methods: 1,014 penitentiary employees (81.8% male) aged 33.

Objectives and Design of the Russian Acute Coronary Syndrome Registry (RusACSR).

The Russian Acute Coronary Syndrome Registry (RusACSR) is a retrospective, continuous, nationwide, Web-based registry of patients with acute coronary syndromes (ACS). The RusACSR is a database that uses a secure Web-based interface for data entry by individual users. Participation in the RusACSR is voluntary.

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

Objective: The aim of this cross-sectional study was to assess the features of autonomic control of the cardiovascular system in pre- and postmenopausal women.

Material And Methods: We studied 185 postmenopausal women aged 59.3±8.

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

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.

[Perspectives of application of evidence-based measures of blood pressure control in patients with arterial hypertension].

Aim: of the study was to assess advantages and disadvantages of existing measures of adequacy blood pressure (BP) control and their appropriateness in Russian population of patients with arterial hypertension (AH).

Material And Methods: Two indicators were studied with the help of American College of Cardiology/American Heart Association methodology (ACC/AHA, 2005): Russian AH registry indicator "Achieving and maintenance of the goal BP" and indicator "Optimal AH treatment" adopted from UK and US measures for the data of Russian AH registry. Each indicator was calculated in the same group comprising 37 827 patients with diagnosis AH.

[Phase and frequency locking of 0.1 Hz oscillations in heart rhythm and baroreflex control of arterial pressure by respiration with linearly varying frequency in healthy subjects].

We studied the features of functional interaction between the subsystems of autonomic control of heart rate (HR) and arterial pressure (AP) giving rise to 0.1 Hz oscillations in R-R intervals (RRI) and photoplethysmogram (PPG). The study included 25 healthy subjects (6 women and 19 men) aged between 18 and 32 years.

[Organization of medical care for patients with non-ST-segment elevation acute coronary syndrome in regional vascular centers and primary vascular units in 2009-2012 (according to the data of the ACS register)].

Aim: To study clinical characteristics of non-ST-segment elevation acute coronary syndrome (NSTEACS) and to assess the quality of medical health in patients with this condition who were treated in the regional vascular centers and primary vascular units from 48 subjects of the Russian Federation in 2009-2012.

Materials And Methods: The medical records of 68 467 patients with the verified diagnosis of NSTEACS, which were entered in the ACS Register database on January 1, 2009, to January 1,2013, were analyzed. The investigation included data on patients aged at least 18 years at admission to hospital with a presumptive diagnosis of ACS, myocardial infarction, or unstable angina pectoris in the case histories.

Active ambulatory care management supported by short message services and mobile phone technology in patients with arterial hypertension.

The use of short message services and mobile phone technology for ambulatory care management is the most accessible and most inexpensive way to transition from traditional ambulatory care management to active ambulatory care management in patients with arterial hypertension (AH). The aim of this study was to compare the clinical efficacy of active ambulatory care management supported by short message services and mobile phone technology with traditional ambulatory care management in AH patients. The study included 97 hypertensive patients under active ambulatory care management and 102 patients under traditional ambulatory care management.

[Investigation of biophysical features of interaction between 0.1 Hz oscillations in heart rate variability and distal blood flow variability].

We studied biophysical features of interaction between 0.1 Hz oscillations in heart rate variability (HRV) and distal blood flow (DBF) variability in healthy subjects and patients after acute myocardial infarction (MI). 125 patients after acute MI (72 male and 53 female) aged between 30 and 83 years and 33 healthy subjects (23 male and 10 female) aged between 20 and 46 years were included in the study.

Evaluation of 5-year risk of cardiovascular events in patients after acute myocardial infarction using synchronization of 0.1-Hz rhythms in cardiovascular system.

Background: Synchronization between 0.1-Hz rhythms in cardiovascular system is deteriorated at acute myocardial infarction (AMI) leading to a disruption of natural functional couplings within the system of autonomic regulation.

Objective: This study evaluates the prognostic value of autonomic regulation indices for the 5-year risk of fatal and nonfatal cardiovascular events in patients after AMI.

[Assessment of the quality of medical assistance for patients with acute ST elevation coronary syndrome for 2009-2010 in regions of the Russian Federation participating in the "vascular program" (by the data of the Russian ACS Register)].

Aim: To assess quality of medical assistance for patients with acute ST elevation coronary syndrome (aSTeCS) for the period from 2009 to 2010 in 23 administrative regions of the Russian Federation (RF) realizing the "vascular program".

Material And Methods: We analysed management of aSTeCS patients treated in the regional vascular centers and/or primary vascular departments of 23 administrative regions of the RF for the period from January 1, 2009 to January 1, 2011. Mean age of the patients was 64 (56-75) years, 65.

Selection of optimal dose of beta-blocker treatment in myocardial infarction patients based on changes in synchronization between 0.1 Hz oscillations in heart rate and peripheral microcirculation.

Background: Selection of the optimal dose of beta-blocker treatment in myocardial infarction (MI) patients is problematic because of a lack of well-established guidelines.

Methods: We evaluated changes in synchronization between 0.1 Hz oscillations in heart rate (HR) and plethysmographic peripheral microcirculation in response to a tilt-table test and to 3-month treatment with the highest tolerated beta-blocker (metoprolol) dose in 43 patients aged between 41 and 77 years with acute MI 6 months prior to the start of the study.

[Outpatient prophylaxis and treatment of arterial hypertension with application of mobile telephone systems and Internet techniques].

Aim: To compare clinical efficacy of standard outpatient follow-up of hypertensive patients with efficacy of such follow-up with application of internet techniques and mobile telephone systems (ITMTS).

Material And Methods: Two groups of hypertensive patients were examined: group 1 (n=97, 45% females, age 49 +/- 11 years) on one-year ITMTS follow-up; group 2 (n=102, 50% females, age 51 +/- 11 years) on standard one-year follow-up. Clinical efficacy was assessed by the rate of achievement and maintenance of target blood pressure, dynamics of modifiable risk factors (smoking, obesity) for a year.