Which type of medication is considered an antiarrhythmic agent?

Disopyramide is classified as an antiarrhythmic agent, which means it is specifically used to treat and prevent irregular heartbeats (arrhythmias). Antiarrhythmic medications work by modifying the electrical activity of the heart, thereby stabilizing heart rhythms. Disopyramide belongs to the class IA antiarrhythmics, which are known to affect sodium channels and have a direct impact on cardiac myocyte action potentials.

In contrast, the other choices serve different medical purposes. Aspirin is an antiplatelet medication commonly used to reduce the risk of blood clot formation; Captopril is an ACE inhibitor primarily prescribed for hypertension and heart failure by helping to relax blood vessels; and Albuterol is a bronchodilator used in the treatment of asthma and other conditions that involve the airways. Consequently, Disopyramide is uniquely recognized for its role in managing heart rhythm disorders, setting it apart as the appropriate answer in this context.