Fig. 5.

Incidence of Ca_i²⁺ and APD alternans with pinacidil (Pin) treatment of monolayers at room temperature. A: incidence of Ca_i²⁺ alternans in control (Con) and after 15-min washin of 50 μM Pin. B: incidence of APD alternans for similar Pin treatment. Left, arrows and numbers show the fate of NA, A_C, and A_D monolayers with Pin exposure. Right, windows of 1:1 capture, AVW, and AVW_D for NA, A_C, and A_D monolayers before (Con) and after the addition of Pin. In the Con columns, PCL_C, PCL_D, and MCL and windows of 1:1 capture, AVW, and AVW_D are defined as in Fig. 3. In the Pin columns, MCL is averaged from all monolayers in the group, AVW from all A monolayers in the group, and AVW_D from all A_D monolayers in the group. See the Supplemental Material for further explanation. Error bars are not shown but are given in Supplemental Table S4.