Table 2—

Cox regression analysis, including sex, age, left ventricular ejection fraction, and New York Heart Association class, for calculation of risk of death at 6 months

Cardiopulmonary variableRisk ratio95% CIp-value
V′O2,peak ≤14 mL·kg-1·min-12.91.5–5.40.002
V′O2,peak ≤10 mL·kg-1·min-12.11.1–4.30.04
V′O2,peak ≤50% normal2.01.1–3.70.03
θL <11 mL·kg-1·min-12.71.3–5.60.007
V′EV′CO2slope >342.71.5–5.10.001
V′O2,peak ≤14 + θL <11 mL·kg-1·min-13.21.5–6.70.003
V′O2,peak ≤14 mL·kg-1·min-1+V′EV′CO2 slope >344.52.1–10<0.001
θL <11 mL·kg-1·min-1+V′EV′CO2 slope >345.12.0–12.70.001
  • CI: confidence interval V′O2,peak: peak oxygen uptake; θL: lactate threshold; V′EV′CO2 slope: slope of the increase in ventilatory equivalent for carbon dioxide. Reprinted from 138 with permission from the publisher.