A and B, Current–voltage relationships in sham and MI (β2a and controls) with or without Iso. C, Iso increased peak ICa,L in control (n=4) but not in β2a ventricular myocytes (VMs) (n=7). D, Iso increased ICa,L in both control-MI (n=6) and β2a-MI VMs (n=5). E and F, Voltage dependence of ICa,L activation in sham or post-MI VMs with or without Iso. *P<0.05 between control and β2a VMs; #P<0.05 with or without Iso.