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Cardiac action potential
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==Clinical significance== [[File:Cardiac action potential.svg|thumb|260x260px|[[Antiarrhythmic agent|Drugs]] affecting the cardiac action potential. The sharp rise in voltage ("0") corresponds to the influx of sodium ions, whereas the two decays ("1" and "3", respectively) correspond to the sodium-channel inactivation and the repolarizing efflux of potassium ions. The characteristic plateau ("2") results from the opening of voltage-sensitive [[calcium channel]]s.]] [[Antiarrhythmic agent|Antiarrhythmic drugs]] are used to regulate [[arrhythmia|heart rhythms]] that are too fast. Other drugs used to influence the cardiac action potential include [[sodium channel blocker]]s, [[beta blocker]]s, [[potassium channel blocker]]s, and [[calcium channel blocker]]s.{{cn|date=May 2025}} {{Clear}}
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