ACC AHA guidelines classification scheme

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The Class designation is used to indicate whether a therapy is recommended or not and the certainty surrounding that recommendation.

Classification of Recommendations

• Class I: Conditions for which there is evidence and/or general agreement that a given procedure or treatment is beneficial, useful, and effective.

• Class II: Conditions for which there is conflicting evidence and/or a divergence of opinion about the usefulness/efficacy of a procedure or treatment.

• Class IIa: Weight of evidence/opinion is in favor of usefulness/efficacy.

• Class IIb: Usefulness/efficacy is less well established by evidence/opinion.

• Class III: Conditions for which there is evidence and/or general agreement that a procedure/treatment is not useful/effective and in some cases may be harmful.

Use the Level of Evidence designation to indicate the strength of the data associated with that recommendation.

Level of Evidence

• Level of Evidence A: Data derived from multiple randomized clinical trials or meta-analyses.
• Level of Evidence B: Data derived from a single randomized trial, or nonrandomized studies.
• Level of Evidence C: Only consensus opinion of experts,case studies, or standard-of-care.

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