# Schematic representations of the three markov chain structures considered in this study.

A: The four independent Markov Chains for each gate of the models Ten Tusscher and Panfilov [23] or Stewart et al. [24] considering only two possible states, Open (*O*) and Close (*C*) for each one. B: The original structure of the Markov Chain used by Mahajan et al. [22] to simulate the I_{CaL} phenomenon. C: The proposed Markov Chain as a combination of the Hodgkin-Huxley formalism rates and the Mahajan et al. [22] topology, to replace the gates in the Ten Tusscher and Panfilov [23] and Stewart et al. [24] models. The MC transitions generated considering the HH gates *d*, *f*, and *f*_{2} are shown respectively in blue, green, and yellow. The calcium-dependent function *f* and the rates associated with the calcium concentration are shown in red. The set of parameters ** x** used to fit both calcium-dependent rates (parameters

*x*

_{0}to

*x*

_{4}) and voltage-dependence rates (parameters

*x*

_{5}to

*x*

_{10}) are shown in black.