What are the common antiarrhythmic drugs?

Common antiarrhythmic drugs mainly include the following categories:

1. Sodium channel blockers: such as Quinidine Sulfate Tablets, Lidocaine Hydrochloride Injection. These drugs inhibit sodium ion influx, slow down myocardial conduction, and thereby counteract arrhythmias.

2. Beta-blockers: These drugs block beta-adrenergic receptors in the heart, reduce myocardial sensitivity to the sympathetic nervous system, and lower heart rate and contractility. They are suitable for various types of arrhythmias, especially those associated with excessive sympathetic nervous system activation. Representative drugs include Metoprolol Tartrate Sustained-Release Tablets and Atenolol Tablets.

3. Potassium channel blockers: such as Amiodarone Hydrochloride Tablets and Sotalol Hydrochloride Tablets. These drugs block potassium channels, prolong the myocardial action potential duration, and thereby control arrhythmias.

4. Calcium channel blockers: These drugs block calcium channels on cardiac and vascular smooth muscle cells, reduce intracellular calcium concentration, and thereby decrease myocardial contractility and cardiac electrical activity. They are indicated for certain types of arrhythmias, such as atrial fibrillation and supraventricular tachycardia. Representative drugs include Verapamil Hydrochloride Tablets and Diltiazem Hydrochloride Tablets.