Figure 3. Effect of halothane on single Potassium sup + channel activity. Unitary outward currents were recorded with ASW and 10 mM tetraethylammonium in the recording pipette at a holding potential of +30 mV. The top trace is a continuous segment of data recorded during a 20-min period from a cell-attached patch on a pleural sensory neuron. Bar indicates a 7-min period when the cell was perfused with bath solution containing 400 micro Meter halothane. Traces (a) and (b) were taken from the indicated points on the upper trace, showing single-channel activity on an expanded time scale before (a) and during (b) perfusion of the cell with halothane-containing solution.