Fig. 8. Action potential duration of ventricular strips at control pH and during acidosis. (A) A representative tracing of AP under both conditions indicates a lengthening of repolarization. (B) Overall results showing hypercapnic acidosis-induced prolongation of the action potential (AP) duration at the time of the 20%, 50% and 90% of repolarization (N=6). *P<0.05 vs value before acidosis.