Memory beyond memory in heart beating: an efficient way to detect pathological conditions

Details Memory beyond memory in heart beating: an efficient way to detect pathological conditions Memory beyond memory in heart beating: an efficient way to detect pathological conditions

2001-07-30

arxiv.org/abs/cond-mat/0107597v1

Physics

Condensed Matter

Statistical Mechanics

submitted to Physical Review Letters, 5 figures

Scientific paper

10.1103/PhysRevE.65.041926

We study the long-range correlations of heartbeat fluctuations with the method of diffusion entropy. We show that this method of analysis yields a scaling parameter $\delta$ that apparently conflicts with the direct evaluation of the distribution of times of sojourn in states with a given heartbeat frequency. The strength of the memory responsible for this discrepancy is given by a parameter $\epsilon^{2}$, which is derived from real data. The distribution of patients in the ($\delta$, $\epsilon^{2}$)-plane yields a neat separation of the healthy from the congestive heart failure subjects.

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