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The correlation dimension of rat hearts in an experimentally controlled environment

Chaos, ISSN: 1054-1500, Vol: 10, Issue: 1, Page: 257-267
2000
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The electric response of several isolated rat hearts in a controlled environment was studied experimentally. The correlation dimension D was estimated and was found to be between 4 and 6.5 when the response was nearly periodic. The variation of D with the concentration of calcium was studied and a general trend of its increase with increasing concentration was found. Two types of ventricular fibrillation (VF) were observed, one that corresponds to a stochastic signal where D is unbounded and the other to a low dimensional dynamical system with 3.5≤D≤4. It was found also that for the heart the correlation dimension is only an approximate concept. A new method for the estimation of D, that is suitable for the case when it is only approximate was introduced. A surrogate data method suitable for the analysis of nearly periodic series was implemented. © 2000 American Institute of Physics.

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