Figure 4. Inhibition of I _KAS with amiodarone is state-dependent.

(A) Superimposed I _K traces in various conditions as labeled. The intrapipette Ca²⁺ was 500 nM. I _K was obtained with the same ramp pulse protocol used in Figure 2 (also shown in the inset). (B) Superimposed I _K traces induced with 250 nM intrapipette Ca²⁺. Similar results were observed in 5 cells. AMD indicates amiodarone.