Table 1—

Exercise indices that have been shown to predict the prognosis of patients with chronic respiratory and cardiac diseases

COPDILDPVDCFCHF
V′O2,peak+++++
θL+
V′EV′CO2 slope and V′EV′CO2 at θL+++
Arterial desaturation++++
6-MWD+++
  • COPD: chronic obstructive pulmonary disease; ILD: interstitial lung disease; PVD: pulmonary vascular disorders; CF: cystic fibrosis; CHF: chronic heart failure; V′O2,peak: peak oxygen uptake; θL: lactate threshold; V′EV′CO2: ventilatory equivalent for carbon dioxide; 6-MWD: 6-min walking test distance. +: sensitive; ++: more sensitive.