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ΔAPDx given by endocardial APDx - epicardial APDx at (A) x=90, (B) 70, (C) 50 and (D) 30% repolarisation obtained during regular 8 Hz pacing. Hypokalaemia decreased ΔAPD90 (Student's t-test), ΔAPD70, but ΔAPD50 and ΔAPD30 were unaltered. These values were not further altered by 0.1 or 2 mM heptanol (P>0.05). APD, action potential duration. (*P<0.05, **P<0.01, ***P<0.001).
