What is a characteristic of Class 1A antiarrhythmic drugs?

Class 1A antiarrhythmic drugs are characterized by their ability to block sodium channels, which helps to stabilize cardiac cell membranes and prevent abnormal electrical activity in the heart. A significant point of this classification is the inclusion of specific drugs known for their efficacy in treating certain types of arrhythmias. Disopyramide and Quinidine are indeed well-known examples of Class 1A agents, as they are particularly effective in managing ventricular and atrial arrhythmias. This identification of these drugs exemplifies their primary role in antiarrhythmic therapy rather than in hypertension management or heart failure treatment, which are associated with other drug classes.