Exercise indices that have been shown to predict the prognosis of patients with chronic respiratory and cardiac diseases
COPD | ILD | PVD | CF | CHF | |
V′O2,peak | + | + | + | + | + |
θL | + | ||||
V′E–V′CO2 slope and V′E–V′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′E–V′CO2: ventilatory equivalent for carbon dioxide; 6-MWD: 6-min walking test distance. +: sensitive; ++: more sensitive.