Unstable periodic orbits in human cardiac rhythms

Narayanan, K. ; Govindan, R. B. ; Gopinathan, M. S. (1998) Unstable periodic orbits in human cardiac rhythms Physical Review E, 57 (4). pp. 4594-4603. ISSN 1063-651X

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Official URL: http://pre.aps.org/abstract/PRE/v57/i4/p4594_1

Related URL: http://dx.doi.org/10.1103/PhysRevE.57.4594


Unstable periodic orbits (UPOs) extracted from experimental electrocardiograph signals are reported for normal and pathological human cardiac rhythms. The periodicity and distribution of the orbits on the chaotic attractor are found to be indicative of the state of health of the cardiac system. The normal cardiac system is characterized by three to four UPOs with typical periodicities and intensities. However, pathological conditions such as premature ventricular contraction, atrio ventricular block, ventricular tachy arrhythmia, and ventricular fibrillation have UPOs whose periodicity and intensity distribution are quite distinct from those of the healthy cases and are characteristic of the pathological conditions. Eigenvalues and the largest positive Lyapunov exponent value for the UPOs are also reported. The UPOs are shown to be insensitive to the embedding dimension and the present UPO analysis is demonstrated to be reliable by the method of surrogate analysis.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:15146
Deposited On:13 Nov 2010 06:39
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