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A, stability diagram when g ks is small (50% of the original value, the original g ks is 0.0245 mS μF−1). Alternans is always electromechanically concordant. B, stability diagram when g ks is large (300% of the original value). In this case, there are three distinct modes of instability; electromechanically concordant alternans (C), electromechanically discordant alternans (D), and quasiperiodic oscillation (E).
