Comparison of ventilatory expired gas parameters used to predict hospitalization in patients with heart failure

Am Heart J. 2002 Mar;143(3):427-32. doi: 10.1067/mhj.2002.119607.


Background: Several ventilatory expired gas measures obtained during exercise testing demonstrate prognostic value in the heart failure (HF) population. Comparison of prognostic efficacy between pertinent measures is sparse.

Methods: The ability of various expressions of peak oxygen consumption (VO2), the relationship between minute ventilation (VE) and carbon dioxide production (VCO2), and the partial pressure of end-tidal carbon dioxide (P(ET)CO2) were assessed to determine which measure(s) best predicted cardiac-related hospitalization over a 1-year period in subjects diagnosed with HF.

Results: Univariate Cox regression analysis found that several expressions of peak VO 2, VE-VCO2 relationship, and P(ET)CO2 were significant predictors of hospitalization. Multivariate Cox regression analysis revealed that the VE/VCO2 slope significantly predicted hospitalization (chi2 = 29.1, P <.00001). Peak VO 2 and P(ET)CO2 did not provide additional predictive value.

Conclusions: The prognostic superiority of the VE/VCO2 slope over peak VO2 may be a result of the latter measure's partial dependence on subject effort and skeletal muscle function.

MeSH terms

  • Adult
  • Aged
  • Analysis of Variance
  • Breath Tests
  • Carbon Dioxide / metabolism*
  • Exercise Test
  • Female
  • Heart Failure / metabolism
  • Heart Failure / physiopathology*
  • Hospitalization*
  • Humans
  • Male
  • Middle Aged
  • Oxygen Consumption*
  • Partial Pressure
  • Prognosis
  • ROC Curve
  • Regression Analysis
  • Respiration*


  • Carbon Dioxide