Quinidine belongs to class antiarrhythmic drug is

i.e. (class I): (510-17-KDT 6th) (367-68-MDT-l1)ANTIARRHYTHMIC DRUGSClass Ia Sodium channel blockers* Depress phase O depolarization* Slow conduction, prolong repolarization Drugs* Quinidine, Procainamide, Disopyramide, MoricizineClass Ib * Shorten repolarization Drugs* Lidocaine, MexiletineClass IC * Depress phase O repolarization, slow conduction* Propafenone is a week calcium channel blocker and b-blockers and prolongs action potential and refractionariness Drugs* Flecainide, PropafenoneClass II b-blockers* Slow AV conduction Drugs* Esmolol, Propanolol, MetoprololClass III * Prolong action potential* Prolong repolarization and ERP Drug* Amiodarone, Bretylium (also class II) Dofetilide, Ibutilide, Dronedarone, SotalolClass IV Calcium Channel blockers Drugs* Verapamil, diltiazem