What is the primary use of disopyramide, commonly known as Norpace?

Disopyramide, also known as Norpace, is primarily used for the treatment of ventricular arrhythmias. This class IA antiarrhythmic drug works by affecting the sodium channels in the cardiac myocytes, helping to stabilize the cardiac rhythm and reduce the frequency of arrhythmias. It effectively slows conduction velocity through the myocardium and prolongs the refractory period, making it beneficial for managing disorders like ventricular tachycardia or premature ventricular contractions.

While related options mention uses such as chemical cardioversion or management of atrial fibrillation, disopyramide is not typically indicated as a first-line treatment for these conditions. Atrial fibrillation usually requires different therapeutic approaches, such as anticoagulation or rate control. Managing hypertension is also not an indication for disopyramide, as this drug specifically targets electrical activity in the heart rather than blood pressure regulation. The focus on ventricular arrhythmias underscores its role in managing critical disturbances in heart rhythm, harnessing its specific pharmacological action in cardiac care.