Final answer:
Class II antidysrhythmic medications are ß-blockers such as metoprolol and propranolol, used to improve cardiac function by blocking certain receptors. These drugs treat cardiovascular issues by preventing vasoconstriction and excessive heart rate increase.
Step-by-step explanation:
Class II antidysrhythmic medications predominantly refer to ß-blockers, which are a type of sympatholytic drug used to treat various cardiovascular diseases by blocking the ß-receptors associated with vasoconstriction and cardioacceleration. These medications, such as metoprolol and propranolol, can improve cardiac function in individuals with conditions like congestive heart failure or those who have suffered a heart attack. Metoprolol specifically blocks the B1-receptor, while propranolol blocks ß-receptors more broadly. Other medications like calcium channel blockers and potassium channel blockers, such as amiodarone and procainamide, are used to treat cardiac dysrhythmia by affecting ion channels involved in the cardiac action potential.