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. Author manuscript; available in PMC: 2010 Feb 19.
Published in final edited form as: J Cardiovasc Electrophysiol. 2001 Oct;12(10):1145–1153. doi: 10.1046/j.1540-8167.2001.01145.x

Figure 8.

Figure 8

Threshold current needed to produce an extrasystole during sinus rhythm. The minimum stimulus current required to produce an action potential that was not the direct result of Purkinje input during 10 seconds of sinusoidal stimulation is plotted as a function of the sinusoidal stimulus frequency for the cases of the nominal model (Nominal), the h gate kinetics increased fivefold (τh/5), and the m gate kinetics decreased by a factor of 10(10τm). Also shown is the threshold current needed to cause an action potential to fire in a cable that was not paced by a sinus beat (Firing).