How does lidocaine exert its antiarrhythmic action?

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Enhancing atrioventricular conductionReducing the excitability of heart muscle cellsAccelerating the speed of cardiac electrical conductionStimulating increased activity of the heart's pacemakerProlonging the refractory period of the sinoatrial node

Explanation

Lidocaine works by lowering the excitability of cardiac cells, which helps to stabilize the heart's rhythm and prevent abnormal electrical activity. It does not enhance conduction or increase pacemaker activity.