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The correlation dimension of rat hearts in an experimentally controlled environment
Guy Dori1, Shmuel Fishman, S. A. Ben-Haim
1Department of Internal Medicine A, Carmel Medical Center, 7 Michal St., Haifa 34362, Israel.
Chaos (Woodbury, N.Y.)
|June 5, 2003
Abstract:
The electric response of several isolated rat hearts in a controlled environment was studied experimentally. The correlation dimension D(2) was estimated and was found to be between 4 and 6.5 when the response was nearly periodic. The variation of D(2) 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(2) is unbounded and the other to a low dimensional dynamical system with 3.5