Fig 7. Representative 1D simulation of the discordant alternans with D = 0.028 mm²/ms at a PCL of 168 ms in HF.

(A(i)) Time-space plot of the membrane potential of a homogeneous, 1D cable. (A(ii)) The corresponding APD₉₀ of each beat, in which black dashed lines with arrows indicate the APD node position as the beat number increases. (A(iii)) Time course traces of AP for the 40^th, 100^th, and 170^th cells, which are marked with black lines in (A(i)). (B(i)) Time-space plot of the Ca²⁺ transient in a homogeneous, 1D cable. (B(ii)) The corresponding peak Ca²⁺ transient of each beat, in which black dashed lines with arrows indicate the peak Ca²⁺ transient node position as the beat number increases. (B(iii)) Time course traces of Ca²⁺ transient for the 40^th, 100^th, and 170^th cells, which are marked with black lines in (B(i)).