| NYHA class | AHA/ACC stage | Overlap between NYHA and AHA/ACC | ||
|---|---|---|---|---|
| I | Asymptomatic from HF with physical activity | A | At risk, but without structural heart disease or signs or symptoms of HF | Based on the stage definitions (patients lacking symptoms), stage A and B correlate with NYHA I. |
| II | Mild symptoms with ordinary physical activity | B | Structural heart disease, without signs or symptoms of HF | |
| III | Significant symptoms with ordinary physical activity. | C | Structural heart disease, with prior or current signs or symptoms of HF | Stage C can have range of class NYHA II-III. |
| IV | HF symptoms with any level of physical activity and at rest | D | Refractory HF; requires consideration for advanced HF therapies | Stage D correlates with class IV symptoms. |
ACC, American College of Cardiology; AHA, American Heart Association; HF, heart failure.