Cardiovascular Medicine Book

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AntiarrhythmicAka: Vaughn Williams Classification

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  1. Class I: Sodium Channel Blockade
    1. Class Ia: Lengthens action potential duration
      1. Quinidine
      2. Procainamide (Pronestyl)
      3. Disopyramide (Norpace)
      4. Imipramine (MAO inhibitor)
      5. Amiodarone (also Class II, III, IV)
    2. Class Ib: No effect on action potential
      1. Lidocaine (Xylocaine)
      2. Tocainide (Tonocard)
      3. Mexiletine (Mexitil)
      4. Phenytoin (Dilantin)
    3. Class Ic: Greater sodium current depression
      1. Flecainide (Tambocor)
      2. Encainide (Enkaid)
      3. Propafenone
  2. Class II: Beta Blocker
    1. Esmolol (Brevibloc)
    2. Sotalol (also Class III)
    3. Amiodarone (also Class Ia, III, IV)
  3. Class III: Prolong Refractory period via action potential
    1. Bretylium (Bretylol)
    2. Sotalol
    3. Amiodarone (also Class Ia, II, IV)
  4. Class IV: Calcium Channel Blocker
    1. Verapamil (Calan)
    2. Diltiazem (Cardizem)
    3. Amiodarone (also Class Ia, II, III)

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