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The knowledge of transitions between regular, laminar or chaotic behavior is essential to understand the underlying mechanisms behind complex systems. While several linear approaches are often insufficient to describe such processes, there are several nonlinear methods which however require rather long time observations. To overcome these difficulties, we(More)
Ventricular tachycardia or fibrillation (VT-VF) as fatal cardiac arrhythmias are the main factors triggering sudden cardiac death. The objective of this study is to find early signs of sustained VT-VF in patients with an implanted cardioverter-defibrillator (ICD). These devices are able to safeguard patients by returning their hearts to a normal rhythm via(More)
The knowledge of transitions between regular, laminar or chaotic behaviors is essential to understand the underlying mechanisms behind complex systems. While several linear approaches are often insufficient to describe such processes, there are several nonlinear methods that, however, require rather long time observations. To overcome these difficulties, we(More)
Schlü sselwörter Herzfrequenzvariabilität – Blutdruckvariabilität – Baroreflex – nichtlineare Kopplung – nichtlineare Dynamik – implantierbarer Defibrillator Summary The main intention of this contribution is to discuss different nonlinear approaches to heart rate and blood pressure variability analysis for a better understanding of the cardiovascular(More)
New methods for the analysis of arrhythmias and their hemodynamic consequences have been applied in risk stratification, particularly to patients after myocardial infarction. This study investigates the suitability of shortterm heart rate turbulence (HRT) in comparison to heart rate and blood pressure variability as well as baroreceptor sensitivity analyses(More)
AIMS The purpose of our study was to investigate the electrical trigger modes of monomorphic ventricular tachycardia, by analysing stored intracardiac electrograms, and to identify haemodynamic or electrocardiographic predictors in patients with cardioverter-defribrillators. METHODS We recorded 286 episodes of monomorphic ventricular tachycardia in 38(More)
The main intention of this contribution is to sketch our way of analysing the 50 time series from the 2002 Computers in Cardiology challenge. The task to cope is to discriminate simulated and physiological heart rate variability signals. Our approach for doing this is rather simple: We exclude time series which show non-physiological behaviour. The methods(More)
Ventricular tachycardia or fibrillation (VT) as fatal cardiac arrhythmias are the main factors triggering sudden cardiac death. The objective of this recurrence quantification analysis approach is to find early signs of sustained VT in patients with an implanted cardioverter-defibrillator (ICD). These devices are able to safeguard patients by returning(More)
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