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. 2012 Mar 1;8(3):e1002399. doi: 10.1371/journal.pcbi.1002399

Figure 1. Bifurcation to alternans and eigenvalues in the three model versions.

Figure 1

A: APD vs. BCL at steady state pacing (relative beat to beat variation of model variables <10−7). The vertical dotted lines denote the bifurcations to alternans. B: Eigenvalues with an absolute value >0.1 vs. BCL. The eigenvalue closest to −1 is the alternans eigenvalue λalt. The eigenvalue closest to +1 is the principal memory eigenvalue λmem. C: Time constant of memory (expressed in number of beats, Eq. 23). D: The same time constant expressed in units of time (Eq. 24).