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Effect of maximal conductance of Na+ channels, gNamax, on propagation across a tissue expansion (see also Fig. 13). The ordinate shows the critical strand width, hc, at which propagation block, illustrated in Fig. 13, occurs. At gNama ≤ 50 mS/cm2 propagation becomes very sensitive to small changes in conductance. Reproduced with permission from V. G. Fast et al., Cardiovasc. Res. 30, 3 (1995). Copyright 1995 Oxford University Press.79
