Fig. 2

Representative traces of MAPs recorded during regular 8 Hz pacing. Before introduction of heptanol, a typical regular rhythm with each MAP occurring directly after its preceding extrinsic stimulus can be observed (A). In contrast, after introduction of 2 mM heptanol, VT can be observed (B). Incidences of VT over the first 10 min after introduction of 0, 0.1, 0.5, 1, and 2 mM heptanol (C). The asterisk indicates that 2 mM heptanol induced significant arrhythmogenic effects (Fisher’s exact test, P < 0.05)