VE/VCO2 slope
Pronunciation: V-E V-C-O-two slope
The relationship between ventilation and carbon dioxide production during exercise, indicating ventilatory efficiency and prognosis.
Full Definition
The VE/VCO2 slope represents the efficiency of ventilation during exercise, calculated as the linear relationship between minute ventilation and carbon dioxide production. In cardiac rehabilitation patients, an elevated VE/VCO2 slope (>30-35) indicates inefficient ventilation and is associated with poor prognosis, particularly in heart failure patients. This parameter provides important prognostic information independent of exercise capacity and helps guide clinical decision-making regarding treatment intensity and monitoring requirements.
Usage
Usage note: Always specify as slope rather than ratio to indicate the linear relationship measurement method.
In Context
- "The patient's VE/VCO2 slope of 42 indicates poor ventilatory efficiency and warrants close monitoring during exercise." — Cardiopulmonary exercise test interpretation
- "Improvement in VE/VCO2 slope from 38 to 32 following cardiac rehabilitation suggests enhanced ventilatory efficiency." — Program outcomes assessment