Figure 4.
Variable effects of KB on action potentials in pig preparations. Superimposed action potential traces (leftmost and middle panels; different cells) recorded in control (unfilled circles) and in the presence of 10 μM KB (filled circles), and average durations (columns; rightmost panels) of the APD at 50% (APD50) and 90% repolarization (APD90). Horizontal dotted lines indicate 0 mV level. Pacing frequency: 1 Hz. (a) Pig ventricular myocytes; room temperature; (b) pig ventricular trabecula; 37°C.