Weber Classification (CPET Functional Class) Calculator
- Weber Classification (CPET Functional Class): Explanation and Clinical Context
The Weber classification categorizes patients with chronic heart failure based on peak oxygen consumption (peak VO₂) measured during cardiopulmonary exercise testing (CPET).
Class A corresponds to peak VO₂ > 20 mL/kg/min, indicating near-normal exercise capacity and favorable prognosis.
Class B (16–20 mL/kg/min) indicates mild limitation of exercise and relatively favorable prognosis.
Class C (10–16 mL/kg/min) indicates moderate limitation and intermediate prognosis.
Class D (< 10 mL/kg/min) indicates severe limitation and poor prognosis.
This classification helps clinicians assess functional capacity, guide therapy, and estimate risk in patients with heart failure.
Reference:
Weber KT, Janicki JS, et al. "Oxygen utilization and ventilatory response to exercise in patients with chronic heart failure." Circulation. 1982;66:547-555. doi:10.1161/01.CIR.66.3.547
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