Title :
Characterization of heart rate variability using a nonlinear model
Author :
Bieberle, T. ; Bolz, A. ; Schaldach, M.
Author_Institution :
Dept. of Biomed. Eng., Erlangen-Nurnberg Univ., Germany
Abstract :
The heart rate variability is investigated using a two dimensional nonlinear model. The time series of the RR-intervals as obtained from 24-h-Holter-ECG monitoring is transferred to a trajectory in a 2D phase space. This trajectory is centered along the bisector in the case of healthy subjects, but covers the main part of the quadrant, if patients with complex arrhythmias are investigated. The box dimension is a quantitative measure of the geometric complexity of the trajectory and reflects the underlying heart dynamics. Patients with absolute arrhythmias in combination with atrial flutter have box dimensions greater than 1.68 whereas healthy subjects exhibit values less than 1.68
Keywords :
biocontrol; cardiology; electrocardiography; nonlinear dynamical systems; patient monitoring; physiological models; time series; 24 h; 24-h-Holter-ECG monitoring; 2D phase space; RR-intervals; absolute arrhythmias; atrial flutter; bisector; box dimension; complex arrhythmias; geometric complexity; healthy subjects; heart dynamics; heart rate variability; nonlinear model; patients; quadrant; time series; trajectory; two dimensional nonlinear model; Biomedical engineering; Biomedical measurements; Biomedical monitoring; Control systems; Fluctuations; Heart rate; Heart rate measurement; Heart rate variability; Nonlinear dynamical systems; Patient monitoring;
Conference_Titel :
Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-2475-7
DOI :
10.1109/IEMBS.1995.579784
