(A): Vm recordings from 3 points, shown spatially in (B), for model
with high-IK(ATP) epicardium, low-IK(ATP) endocardium, and
sub-endocardial PS endpoints. Arrows indicate wavefront propagation, with
conduction block indicated by double lines. Vm snapshots for
highlighted intervals are shown in B-D (10ms between snapshots;
same Vm scale as Fig. 4). (B): Excitation propagates from the
midmyocardium towards both surfaces. (C): Conduction to low-IK(ATP)
endocardium blocks due to intrinsically longer APs. (D): Activation proceeds
from recovered endocardium to epicardium.