FIG. 11.

Action potential duration (APD)–spatially discordant alternans (SDA) and Ca-SDA patterns in a one-dimensional (1D) cable of the rabbit ventricular cell model. (a) Bifurcation diagrams showing $a$ and peak $c_i$ vs the pacing period $T$. (b)-(f) Steady-state APD-SDA and Ca-SDA patterns for different initial conditions. The spatial scales of random initial conditions in (d)-(f) are $l=50$ cells, $l=10$ cells, and $l=1$ cell, respectively. $T=180\text{ms}$. Random initiation conditions are set by random initial values of the sarcoplasmic reticulum (SR) Ca load.