A5045727580- Heart Rate Variability and Autonomic Control
- Non-Invasive Vital Sign Monitoring
- ECG Monitoring and Analysis
- Cardiac and Coronary Surgery Techniques
- Cardiac Ischemia and Reperfusion
- EEG and Brain-Computer Interfaces
- Cardiac, Anesthesia and Surgical Outcomes
- Hemodynamic Monitoring and Therapy
- Cardiac Arrhythmias and Treatments
- Mitochondrial Function and Pathology
- Cardiac electrophysiology and arrhythmias
- Advanced MRI Techniques and Applications
- Cardiac Valve Diseases and Treatments
- Cardiac Imaging and Diagnostics
- Mechanical Circulatory Support Devices
- Electromagnetic Fields and Biological Effects
- Cardiac Arrest and Resuscitation
- Aortic Disease and Treatment Approaches
- Cardiovascular Syncope and Autonomic Disorders
- Epilepsy research and treatment
- Anesthesia and Neurotoxicity Research
- Cardiac pacing and defibrillation studies
- Infective Endocarditis Diagnosis and Management
- Aortic Thrombus and Embolism
- Pain Management and Treatment
University of Pecs
2013-2023
University of Alabama at Birmingham
2006
Heim Pál Gyermekkórház
2000
Today mobile health-monitoring devices calculate heart rate and its variability mostly from the photoplethysmogram (PPG). Minimizing power consumption is crucial, one option optimizing signal sampling rate. Present study aimed to determine minimal frequency of PPG signal, which sufficient for accurate (HRV) analysis. 57 high-quality, 5-minute signals healthy volunteers sampled at 1 kHz (master) were decimated by a factor 2, 5, 10, 20, 50, 100, 200, 500, then cubic spline parabola...
One of the possible pathomechanisms sudden death in epilepsy (SUDEP) is a postictal dysregulation autonomic nervous system. We performed heart rate variability (HRV) analysis periictal state to analyze whether cardiac disturbance exists after an epileptic seizure.We included 31 video-EEG-ECG recordings patients with who had consecutively undergone pre-surgical evaluation. Nine generalized tonic-clonic (GTCS), 15 complex partial, and seven simple motor seizures were included. HRV was...
Heart rate variability (HRV) analysis is considered a simple method for investigating neurocardiac regulation. However, measures of HRV may be corrupted by technical artifacts. In order to investigate the consequences digitization errors on time domain parameters, from model tachograms resampled at different rates were compared. Two 375-element human ECG tracings shifted mean 800 ms and stretched standard deviations (SD) 5–120 in 5 steps. All 1–10 1 steps, 10 times repetitively each...
Heart rate asymmetry (HRA) quantifies the uneven distribution of points above and below identity-line in a Poincaré plot RR-intervals. The authors investigated if HRA could be influenced by inspiration/expiration ratio. Healthy volunteers (n = 18) were studied supine position at 4.5 s metronome breathing. ECG breathing signals recorded for 360 each pattern: inspiration controlled, controlled (1:2, 1:1, 2:1 ratio), again. Time domain, frequency domain heart variability (HRV) analysis with...
Abstract Recently there has been great interest in photoplethysmogram signal processing. However, its minimally necessary sampling frequency for accurate heart rate variability parameters is ambiguous. In the present paper frequency-modulated 1.067 Hz cosine wave modelled variable PPG silico . The five-minute-long, 1 ms resolution master-signals were decimated (D) at 2-500 ms, then cubic spline interpolated (I) back to resolution. mean pulse rate, standard deviation, root square of...
Evaluation of heart rate variability (HRV) detects the early subclinical alterations autonomic nervous system. Thus, impaired HRV is earliest marker cardiac neuropathy (CAN) in type 1 diabetes mellitus (T1DM).We aimed to explore parameters asymptomatic T1DM patients and compare them with results obtained healthy subjects. Potential associations between established risk factors for CAN cardiovascular diseases were also investigated.Seventy (38 ± 12 years, 46 females) 30 subjects enrolled into...
Heart rate variability (HRV) analysis is considered a popular method both in clinical and research fields. However, several ignored technical artifacts may falsify its measurements. The current study investigates the effects of corner frequencies ECG amplifier on precision RR-interval detection. Clear or noise-corrupted records with predefined parameters consisting 21 cycles were generated, played back through analog filters data-logged Pentium-based computer DaqBoard2000 data acquisition...
Mobile phones may have harmful health effects and clinical examinations report ambiguous results of exposure concerning neurophysiological cardiovascular actions.This study investigated heart rate asymmetry (HRA) variability (HRV) parameters with 1:2 1:1 metronome-paced inspiration/expiration ratios during short-term 1,800MHz GSM cellular phone in 20 healthy volunteers.Significant HRA changes by Porta Guzik indices were not found on compared to sham exposure. Time-domain HRV showed...
The aim of this study was to investigate the effects carbon-dioxide treatment on heart rate variability (HRV) parameters: mean RR interval (RRI), standard deviation intervals (SDNN), root square successive differences (RMSSD); and Porta Guzik indices, as measures asymmetry.Twenty patients were enrolled (mean±SD, age=59±7.8 years). Measurements performed before CO2 treatment, at beginning 15 min immediately after 1 h treatment.Significant increase in SDNN found when compared that it...
The aim of this study was to assess the acute effects physical vascular therapy (PVT) on autonomous nervous system by heart rate variability (HRV) and asymmetry (HRA) analysis. low-frequency, pulsed electromagnetic field (<35 μTesla) with a patented BEMER pattern can improve vasomotion microcirculation. A non-invasive confirmation instant PVT may provide an opportunity give immediate feedback patient therapist.Altogether 48 patients inward rehabilitation coronary disease (CHD) were involved,...
ECG-based heart rate variability (HRV), and more recently, optical pulse (PRV) analysis used in wearables are non-invasive tools of neurocardiac investigation. Pulse arrival time (PAT) is derived from their simultaneous recording. We examined the beat-to-beat PAT greater detail, while analyzed PRV to HRV relationship. acquired 300sec ECG, photoplethysmogram (PPG), respiratory-signals 35 young, healthy volunteers a supine position including different breathing patterns. at eight reference...
Abstract Purpose To demonstrate the usefulness of normalized ΔR1 (ΔR1 n ) mapping in myocardial tissue following administration contrast agent (CA) Gd(ABE‐DTTA). Materials and Methods Ischemia‐reperfusion experiments were carried out 11 dogs. The method exploited relatively long lifetime Gd(ABE‐DTTA), thus no fast R1 measurement technique was needed. Myocardial perfusion determined with colored microspheres (MP). Results With varying extent ischemia, impaired wall motion (WM) lower values...
The availability of microcomputer-based portable devices facilitates the high-volume multichannel biosignal acquisition and analysis their instantaneous oscillations inter-signal temporal correlations. These new, non-invasively obtained parameters can have considerable prognostic or diagnostic roles. present study investigates inherent signal delay obligatory anti-aliasing filters. One cycle each 8 electrocardiogram (ECG) 4 photoplethysmogram signals from healthy volunteers artificially...