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On the evidence of deterministic chaos in ECG: Surrogate and predictability analysis

Chaos 8, 495 (1998); doi:10.1063/1.166330

Issue Date: June 1998

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R. B. Govindan, K. Narayanan, and M. S. Gopinathan
Department of Chemistry, Indian Institute of Technology, Madras, Chennai, India-600 036
The question whether the human cardiac system is chaotic or not has been an open one. Recent results in chaos theory have shown that the usual methods, such as saturation of correlation dimension D2 or the existence of positive Lyapunov exponent, alone do not provide sufficient evidence to confirm the presence of deterministic chaos in an experimental system. The results of surrogate data analysis together with the short-term prediction analysis can be used to check whether a given time series is consistent with the hypothesis of deterministic chaos. In this work nonlinear dynamical tools such as surrogate data analysis, short-term prediction, saturation of D2 and positive Lyapunov exponent have been applied to measured ECG data for several normal and pathological cases. The pathology presently studied are PVC (Premature Ventricular Contraction), VTA (Ventricular Tachy Arrhythmia), AV (Atrio-Ventricular) block and VF (Ventricular Fibrillation). While these results do not prove that ECG time series is definitely chaotic, they are found to be consistent with the hypothesis of chaotic dynamics. ©1998 American Institute of Physics.
History: Received 19 June 1997; accepted 1 February 1998
Permalink: http://link.aip.org/link/?CHAOEH/8/495/1
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KEYWORDS and PACS

Keywords
PACS
  • 87.59.Wc
    Biological and medical physics Medical imaging Thermography, visible radiation imaging, and other imaging and diagnostic techniques.
  • 05.45.+b
    Statistical physics and thermodynamics Theory and models of chaotic systems
  • YEAR: 1998

PUBLICATION DATA

ISSN:
1054-1500 (print)   1089-7682 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (40)
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