1Casanova C,Cote C,Matin JM,et al.Distance and oxygen desaturation during the 6-min walk test as predictors of long-term mortality in patients with COPD.Chest,2008,134:746-752.
2Little SA,Elkholy MM,Chalmers GW,et al.Predictors of nocturnal oxygen desaturation in patients with COPD.Respir Med,1999,93:202-207.
3Nonoyama ML,Brooks D,Guyatt GH,et al.Effect of oxygen on health quality of life in patients with chronic obstructive pulmonary disease with transient exertional hypoxemia.Am J Respira Crit Care Med,2007,176:343-349.
4GOLD Executive Committee.Global strategy for the diagnosis,management,and prevention of chronic obstructive pulmonary disease(Updated 2009).www.goldcopd.com.
