Final answer:
Class I antidysrhythmic meds are potassium channel blockers that impede the movement of potassium ions through voltage-gated channels, affecting the repolarization phase of the cardiac action potential.
Step-by-step explanation:
Potassium channel blockers, such as amiodarone and procainamide, are categorized as class I antidysrhythmic medications. These medications are used to treat abnormal electrical activity in the heart, known as cardiac dysrhythmia. They work by impeding the movement of potassium ions (K+) through voltage-gated potassium channels, which play a crucial role in the repolarization phase of the cardiac action potential.