According to the Vaughan Williams classification system,which class of antiarrhythmic agents consists mainly of $\beta$ blockers?

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Class IA agents block fast sodium channels in the myocardium,specifically in the atrium.The actions of class IB agents are limited to ventricular arrhythmias.Class II agents consist mainly of F1F1F1S1?F1F1F10-blocking agents.These agents are used in the management of hypertension and post-myocardial infarction;metoprolol is the only agent in this class that may be used in the setting of chronic heart failure.Class III agents are used in both supraventricular and ventricular arrhythmias.Class IV agents are calcium channel blockers (CCBs).Only two CCBs are used in the management of supraventricular arrhythmias and ventricular rate control for atrial fibrillation: verapamil (Isoptin)and diltiazem (Cardizem).

According to the Vaughan Williams Classification System,which Class of Antiarrhythmic β\betaβ

According to the Vaughan Williams Classification System,which Class of Antiarrhythmic $\beta$