Vaughn-Williams classifications (I, II, III, IV) are the same as the American Heart Association's classifications (I, IIa, IIb, III) of a drug's effectiveness.

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The Vaughn-Williams classifications (I-IV) refer to a drug's mechanism of action on cardiac ion channels, whereas the American Heart Association classifications (I, IIa, IIb, III) refer to the level of evidence supporting the use of a drug for a specific indication.

Vaughn-Williams Classifications (I, II, III, IV) Are the Same as the American