Figure 8. Results computed using the Beeler-Reuter21 model of a ventricular cell, a biologically realistic membrane model consisting of a fast inward sodium current, a background sodium current, a slowly activating calcium++ current, a delayed rectifier potassium current, and an inward rectifier current. Shown here are the computed ECGs (EKG in A) and tip trajectories (B) for two different values of the inward rectifier conductance. For a gKI value of 0.35 mS, the core was circular and stationary and the ECG showed a monomorphic pattern. When the gKI value was reduced to 0.31 mS, the core assumed a more elliptical shape and rotated at a slow rate. The tip trajectory outlined the perimeter of a multipetaled flower, and the resulting ECG was polymorphic.
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