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Heart rate variability
Items for "Heart rate variability"
A Theoretical Appraisal of the Dependence of Respiratory Sinus Arrhythmia on Gradual Vagal Blockade
MOTIVATION: The high frequency (HF) indices of heart rate variability (HRV), which reflect the magnitude of respiratory sinus arrhythmia (RSA), have been repeatedly used as measures of cardiac vagal tone...
Keywords: Heart rate variability, high frequency component, cardiac parasympathetic control
01/2004 | Methods of Information in Medicine, SchattauerECG Analysis for Sleep Apnea Detection
OBJECTIVES: The objective of our study was to find out whether obstructive sleep apnea (OSA) may be detected on ECGs recorded during sleep. METHODS: We have analyzed 70 eight-hour single-channel ECG recordings taken at polysomnographia...
Keywords: Sleep apnea, ECG analysis, Heart rate variability
01/2004 | Methods of Information in Medicine, SchattauerAssessment of Cardiovascular Autonomic Control by the Empirical Mode Decomposition
OBJECTIVES: Heart-rate variability (HRV) is an interesting tool for assessing cardiac autonomic system control, but nonstationarities raise problematic issues...
Keywords: Empirical mode decomposition, Heart rate variability, sympatho-vagal balance
01/2004 | Methods of Information in Medicine, SchattauerCharacterization of Heart Rate Variability Changes Following Asphyxia in Rats
OBJECTIVES: A non-invasive method to monitor the functioning of the autonomous nervous system consists in heart rate variability (HRV) analysis...
Keywords: Heart rate variability, autonomous nervous system, linear and nonlinear analysis, approximate entropy
01/2004 | Methods of Information in Medicine, SchattauerForecasting of Life Threatening Arrhythmias Using the Compression Entropy of Heart Rate
OBJECTIVES: Ventricular tachycardia (VT) provoking sudden cardiac death (SCD) are a major cause of mortality in the developed countries...
Keywords: Implantable cardioverter defibrillators, Heart rate variability, Nonlinear Dynamics
01/2004 | Methods of Information in Medicine, SchattauerInformation Flow Enables Specific Identification of Particular Physiological Controllers Based on their Time Scales
OBJECTIVES: Complex physiological systems, such as the cardiovascular system, controlled by the autonomic nervous system, and the gait and posture system, controlled by the sensomotor nervous system, incorporate several controllers acting at different time scales...
Keywords: complexity, autonomic information flow, Heart rate variability, gait information flow
01/2007 | Methods of Information in Medicine, SchattauerInvestigation of the Influence of Swallowing, Coughing and Vocalization on Heart Rate Variability with Respiratory-phase Domain Analysis
OBJECTIVES: The objective of our study is to investigate extrinsic influences on heart rate variability using respiratory-phase domain analysis...
Keywords: Heart rate variability, respiratory phase, respiratory sinus arrhythmia
01/2007 | Methods of Information in Medicine, SchattauerAnalysis of Heart Rate Variability to Predict Patient Age in a Healthy Population
OBJECTIVES: To estimate age of healthy subjects by means of the heart rate variability (HRV) parameters thus assessing the potentiality of HRV indexes as a biomarker of age...
Keywords: Age prediction, Heart rate variability
01/2007 | Methods of Information in Medicine, SchattauerEffect of Common Driving Sources to the Feedback Analysis of Heart Rate Variability
OBJECTIVES: This paper examines the operational characteristics of the multivariate autoregressive analysis applied to the simultaneous recordings of the instantaneous heart rate (IHR) and the change in systolic blood pressure (SBP)...
Keywords: autonomic nervous system, Heart rate variability, blood pressure, feedback analysis, multivariate autoregressive model, operational characteristics
01/2007 | Methods of Information in Medicine, SchattauerAnalysis of complex physiological systems by information flow: a time scale-specific complexity assessment / Analyse komplexer physiologischer Systeme mit Hilfe des Informationsflusses über spezielle Zeitskalen
In the last two decades conventional linear methods for biosignal analysis have been substantially extended by non-stationary, non-linear, and complexity approaches...
Keywords: autonomic information flow, complexity, gait information flow, Heart rate variability, autonomer Informationsfluss, Gang-Informationsfluss, Herzfrequenzvariabilität, Komplexität
07/2006 | Biomedizinische Technik, Walter de GruyterComparison of three methods for beat-to-beat-interval extraction from continuous blood pressure and electrocardiogram with respect to heart rate variability analysis
In recent years the analysis of heart rate variability (HRV) has become a suitable method for characterizing autonomous cardiovascular regulation...
Keywords: Elektrokardiogramm, Extraktionsalgorithmus, Herzratenvariabilität, Schlag-zu-Schlag-Intervall
07/2006 | Biomedizinische Technik, Walter de GruyterCircadian and ultradian rhythms in heart rate variability
Keywords: heart rate, Heart rate variability, ultradian rhythms
10/2006 | Biomedizinische Technik, Walter de GruyterMultivariate and multidimensional analysis of cardiovascular oscillations in patients with heart failure
Within 5 years of first diagnosis, nearly 60% of patients with heart failure (HF) suffer from cardiac death...
Keywords: blood pressure variability, cardiovascular disease, Heart rate variability
10/2006 | Biomedizinische Technik, Walter de GruyterNon-linear dynamic analysis of the cardiac rhythm during transient myocardial ischemia
Coronary artery occlusions related to myocardial ischemia drive cardiac control system reactions that may lead to heart failure...
Keywords: angioplasty, cardiac ischemia, complex systems, fractal analysis, Heart rate variability
10/2006 | Biomedizinische Technik, Walter de GruyterComplex autonomic dysfunction in cardiovascular, intensive care, and schizophrenic patients assessed by autonomic information flow
Keywords: autonomic information flow, complexity, Heart rate variability, risk stratification
10/2006 | Biomedizinische Technik, Walter de GruyterRevisiting the potential of time-domain indexes in short-term HRV analysis
In the context of HRV analysis, we evaluated the information content of two measures that can easily be derived from the classical RR time-domain indexes...
Keywords: cardiac sympathetic index, Heart rate variability, LF/HF, Poincaré plot
10/2006 | Biomedizinische Technik, Walter de GruyterThe missing link between cardiovascular rhythm control and myocardial cell modeling
Cardiac arrhythmia is currently investigated from two different points of view. One considers ECG biosignal analysis and investigates heart rate variability, baroreflex control, heart rate turbulence, alternans phenomena, etc...
Keywords: ECG, Heart rate variability, myocardial cell models
10/2006 | Biomedizinische Technik, Walter de GruyterClinical correlates of non-linear indices of heart rate variability in chronic heart failure patients
We assessed the clinical correlates of a comprehensive set of non-linear heart rate variability (HRV) indices computed from 24-h Holter recordings for 200 stable chronic heart failure (CHF) patients [median age (lower quartile, upper quartile) 54 (47, 58) years, LVEF 23% (19%, 28%)]...
Keywords: chronic heart failure, Heart rate variability, non-linear dynamics
10/2006 | Biomedizinische Technik, Walter de GruyterRecurrence analysis of nocturnal heart rate in sleep apnea patients
This study examines the utility of recurrence analysis in the field of sleep apnea detection from heart rate series...
Keywords: ECG, Heart rate variability, recurrence plot, Sleep apnea
10/2006 | Biomedizinische Technik, Walter de GruyterNormalized correlation dimension for heart rate variability analysis
In this paper we use the concept of large-scale dimension densities to analyze heart rate variability data...
Keywords: congestive heart failure, correlation dimension, Heart rate variability
10/2006 | Biomedizinische Technik, Walter de GruyterAttenuated autonomic function in multiple organ dysfunction syndrome across three age groups
Multiple organ dysfunction syndrome (MODS) is the failure of several organs after a trigger event...
Keywords: age, baroreflex sensitivity, chemoreflex sensitivity, Heart rate variability, multiple organ dysfunction syndrome
10/2006 | Biomedizinische Technik, Walter de GruyterHeart rate asymmetry by Poincaré plots of RR intervals
The Poincaré plot is a widely used method for visualizing and calculating heart rate variability and for investigating the oscillatory nature of heart action...
Keywords: heart rate acceleration, heart rate deceleration, Heart rate variability, Poincaré plots
10/2006 | Biomedizinische Technik, Walter de GruyterAutonomic cardiac control in animal models of cardiovascular diseases. I. Methods of variability analysis
Analysis of heart rate variability (HRV) and blood pressure variability (BPV) and baroreceptor sensitivity (BRS) has become a proven tool in clinical cardiovascular diagnostics and risk stratification...
Keywords: Animal model, baroreceptor sensitivity, blood pressure variability, cardiovascular characterization, Heart rate variability, non-linear dynamics
02/2007 | Biomedizinische Technik, Walter de GruyterAutonomic cardiac control in animal models of cardiovascular diseases II. Variability analysis in transgenic rats with ?-tropomyosin mutations Asp175Asn and Glu180Gly
Animal models of cardiovascular diseases allow to investigate relevant pathogenetic mechanisms in detail...
Keywords: baroreflex sensitivity, blood pressure variability, familiar hypertrophic cardiomyopathy, Heart rate variability
02/2007 | Biomedizinische Technik, Walter de GruyterLow HRV entropy is strongly associated with myocardial infarction
Heart rate variability (HRV) is a marker of autonomous activity in the heart. An important application of HRV measures is the stratification of mortality risk after myocardial infarction...
Keywords: Burrows-Wheeler compression, Bzip2, decision tree, entropy estimation, Heart rate variability
10/2006 | Biomedizinische Technik, Walter de GruyterChanges in heart rate variability of athletes during a training camp
Heart rate variability (HRV) reflects regulatory processes of the cardiovascular system and reveals fractal characteristics...
Keywords: detrended fluctuation analysis, Heart rate variability, overtraining
10/2006 | Biomedizinische Technik, Walter de GruyterAsymmetry of the acceleration and deceleration capacity of heart rate is strongly dependent on ventricular premature complexes / Die Abhngigkeit der Asymmetrie von Akzelerations- und Dezelerationskapazitt der Herzfrequenz vom Auftreten ventrikulrer Extras
In this letter, we explain the role of acceleration and deceleration capacities as novel risk predictors after myocardial infarction and their relation to the occurrence of ventricular premature complexes.
Keywords: deceleration capacity, ECG analysis, Heart rate variability, risk stratification, ventricular premature beats, EKG-Analyse, Herzratenvariabilitt, Risikostratifizierung, ventrikulre Extrasystolen
06/2007 | Biomedizinische Technik, Walter de GruyterChanges of blood pressure and heart rate variability precede a grand mal seizure in a pregnant woman
In order to evaluate blood pressure- and heart rate variability as a potent diagnostic tool for different hypertensive pregnancy disorders we started a clinical trial recording these variables in early pregnancies predisposed for preeclampsia...
Keywords: blood pressure variability, eclampsia, grand mal seizure, Heart rate variability, pregnancy
11/2004 | Journal of Perinatal Medicine, Walter de GruyterMaturation of the autonomic nervous system: differences in heart rate variability in premature vs. term infants
Keywords: autonomic nervous system, baroreceptor reflex, Heart rate variability, maturation, premature, respiratory modulation
08/2006 | Journal of Perinatal Medicine, Walter de GruyterHuman fetal heart rate variability-characteristics of autonomic regulation in the third trimester of gestation
Keywords: autonomic nervous system, fetal magnetocardiography, fetal state, Heart rate variability, sympatho-vagal balance
09/2008 | Journal of Perinatal Medicine, Walter de GruyterPrecursors of syncope in linear and non-linear parameters of heart rate variability during pediatric head-up tilt test
The aim of this study was to identify precursors of neurocardiogenic syncope (NCS) in ECG parameters of children and adolescents who undergo head-up tilt testing (HUTT)...
Keywords: head-up tilt test, Heart rate variability, joint recurrence, non-linear dynamics, syncope
06/2008 | Biomedizinische Technik, Walter de Gruyter