Weber’s functional classification of patients according to aerobic exercise capacity:
| V˙o2 (ml/kg/min) | |
|---|---|
| Source: Weber K, Kinasewitz G, Janicki J, Fishman A. Oxygen utilization and ventilation during exercise in patients with chronic congestive heart failure. Circulation1982;:–23. | |
| Class A | >20 |
| Class B | 16–20 |
| Class C | 10–16 |
| Class D | <10 |