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Antiarrhythmics, Block potassium channels → prolong repolarization →…
Antiarrhythmics
CLASS I (Na+-channel blockers)
CLASS II (ß-adrenoreceptor blockers)
Block beta-adrenergic receptors → slow SA node → decrease heart rate and conduction (especially at the AV node).
Atenolol
Esmolol
Metoprolol
CLASS III (K+ channel blockers)
CLASS IV (Ca2+ channel blockers)
Class V: Miscellaneous
Digoxin
Magnesium sulfate
Adenosine
Ranolazine
Block potassium channels → prolong repolarization → increase action potential duration.
Amiodarone
Dofetilide
Dronedarone
Ibutilide
Sotalol
Block sodium channels → slow depolarization → slow the heart's electrical conduction.
Class IB
Lidocaine
Mexiletine
Class IC
Flecainide
Propafenone
Class IA
Quinidine
Procainamide
Disopyramide
Block calcium channels → slow conduction through AV node → reduce heart rate.
Diltiazem
Verapamil