What is Vaughan Williams classification system?
The Vaughan-Williams classification is the system used to categorize antiarrhythmic drug therapy into class IA, class IB, class IC, class II, class III, class IV and class V. See antiarrhythmic drug therapy section for specific qualities of these classes and information regarding the specific drugs.
What is Vaughan Williams classification of antiarrhythmic drugs?
Vaughan-Williams Classification of Antiarrhythmic Drugs
| Condition | Drug |
|---|---|
| Sinus tachycardia | Class II, IV |
| Atrial fibrillation/flutter | Class IA, IC, II, III, IV digitalis |
| Paroxysmal supraventricular tachycardia | Class IA, IC, II, III, IV adenosine |
| AV block | atropine |
What are Class 1C drugs?
Background. Class 1C antiarrhythmic drugs (AADs) are effective first‐line agents for atrial fibrillation (AF) treatment. However, these agents commonly are avoided in patients with known coronary artery disease (CAD), due to known increased risk in the postmyocardial infarction population.
What are the Class 1 antiarrhythmic drugs?
Class I: Fast sodium (Na) channel blockers
- Ia -Quinidine, procainamide, disopyramide (depress phase 0, prolonging repolarization)
- Ib -Lidocaine, phenytoin, mexiletine (depress phase 0 selectively in abnormal/ischemic tissue, shorten repolarization)
What drug class is flecainide?
Flecainide is in a class of medications called antiarrhythmics. It works by slowing electrical signals in the heart to stabilize the heart rhythm.
What is a Class III antiarrhythmic?
Class 3 antiarrhythmics are drugs that block cardiac tissue K channels. The medications in this class include amiodarone, dronedarone, sotalol, ibutilide, dofetilide, and bretylium. The main mechanism of action includes blocking the cardiac K channels to prolong repolarization.
What is the main difference between Class 1a and Class 1c antiarrhythmic drugs?
Class Ic drugs are more potent antiarrhythmics than either class Ia or class Ib drugs. Class Ic drugs do not block potassium channels directly. Class Ic drugs may organize and slow atrial tachyarrhythmias enough to permit 1:1 AV conduction with marked acceleration of the ventricular response rate.
What is a Class 1A drug?
A class 1A antiarrhythmic agent used to treat life-threatening ventricular arrhythmias. Quinidine. A medication used to restore normal sinus rhythm, treat atrial fibrillation and flutter, and treat ventricular arrhythmias. Procainamide. A medication used to treat life threatening ventricular arrhythmias.
Which drug is a Class III Antidysrhythmic?
Class III Antiarrhythmic Drugs: Amiodarone, Ibutilide, and Sotalol.
What is a Class 5 antiarrhythmic?
Class 5 antiarrhythmic drugs are a miscellaneous group of medications that do not belong to a traditional class of antiarrhythmics. These drugs have varied mechanisms of action and uses. The medications in this class are digoxin, adenosine, Mg sulfate, and atropine.
What is class 3 antiarrhythmic?
Class 3 antiarrhythmics are drugs that block cardiac tissue K channels. The medications in this class include amiodarone, dronedarone, sotalol, ibutilide, dofetilide, and bretylium.