Final answer:
Class III antidysrhythmic medications are potassium channel blockers that help stabilize and regulate the electrical activity of the heart. They are used to treat cardiac dysrhythmia and restore a normal heart rhythm.
Step-by-step explanation:
Class III antidysrhythmic medications are a type of medication used to treat abnormal electrical activity in the heart, known as cardiac dysrhythmia. These medications are potassium channel blockers and work by impeding the movement of potassium ions through voltage-gated potassium channels. By doing so, they help to stabilize and regulate the electrical activity of the heart, restoring a normal heart rhythm. Examples of class III antidysrhythmic medications include amiodarone and procainamide.