Which antidysrhythmic agent also dilates coronary arteries and is frequently used to treat angina?
1. Verapamil (Calan)
2. Amiodarone (Cordarone)
3. Procainamide (Pronestyl)
4. Lidocaine (Xylocaine)
1
Rationale 1: Verapamil is a calcium channel blocker that is often used to treat angina by dilating coronary arteries.
Rationale 2: Amiodarone is a potassium channel blocker that prolongs the action potential and decreases automaticity.
Rationale 3: Procainamide is a sodium channel blocker that reduces automaticity and slows conduction of the action potential across the myocardium. Rationale 4: Lidocaine is a sodium channel blocker and is indicated for ventricular dysrhythmias.
Global Rationale: Verapamil is a calcium channel blocker that is often used to treat angina by dilating coronary arteries. Amiodarone is a potassium channel blocker that prolongs the action potential and decreases automaticity. Procainamide is a sodium channel blocker that reduces automaticity and slows conduction of the action potential across the myocardium. Lidocaine is a sodium channel blocker and is indicated for ventricular dysrhythmias.
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