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. 2003 Dec;85(6):3666–3686. doi: 10.1016/S0006-3495(03)74784-5

FIGURE 4.

FIGURE 4

(A) Plot of the ratio x = APD/T versus T. The circles correspond to values of x computed from the experimental AP clamps, and the line is the corresponding fit. (B) Maximum and minimum of bulk myoplasmic calcium concentration during steady state as a function of pacing period T at relatively slow pacing rates. The solid lines are for the case when the internal sodium concentration increases with decreasing period according to Eq. 17. The filled circles correspond to the experimental data points from Chudin et al. (1999). The dashed line corresponds to the case when intracellular sodium is fixed at Nai = 10 mM.