Fig. 3.

Cardiac electrical wave characteristics in rabbit and alligator at 38°C (red) and 23°C (blue) across BCLs. (A) APD. APDs in rabbit exhibit an increased temperature-dependent divergence at larger BCLs, but alligator APDs are consistently altered by temperature across all BCLs. (B) CV. Reduction of CV at 23°C is substantial in rabbit but negligible in alligator. (C) Action potential wavelength ${\lambda }_{\text{APD}}$. VF occurred in rabbit hearts when stimulated at BCLs for which ${\lambda }_{\text{APD}}$ fell below the ventricular length scale (yellow region below horizontal dashed line). The long VFRP in the alligator prohibited ${\lambda }_{\text{APD}}$ from approaching this critical zone. Insets are magnifications of correspondingly colored regions.