Figure 4. Effects of thiopental on current-voltage relationships of potassium currents recorded using the voltage ramp protocol. (A) A typical example of current-voltage relations recorded in the absence (control, 1) and in the presence of 50 micro Meter thiopental (2) in the same cell. (Inset A) The range of membrane potentials over which the inward rectifier potassium (IKl) and delayed rectifier potassium (I sub K) currents are operative. (B) Current-voltage relation of the thiopental-blocked current obtained by subtracting curve 2 from curve 1. (Inset B) Voltage ramp protocol used in this experiment.