4Pinto-Plata VM,Cote C,Cabral H,et al.The 6-min walk distance; change over time and value as a predictor of survival in severe COPD[J].Eur Respir J,2004,23:28 ～33.
6Casanova C,Cote C,de Torres JP,et al.Inspiratory-to-otal lung capacity ratio predicts mortality in patients with chronic obstructive pulmonary disease[J].Am J Respir Crit Care Med,2005,171 (6):591 ～597.
7Cellib R,Macnee W.ATS/ERS Task Force.Standards for the diagnosis and treatment of patients with COPD; summary of the ATS/ERS position paper[J].Eur Respir J,2004,23(6):932 ～946.
6O'Donnell DE. Assessment of Bronchodilator Efficacy in Symptomatic COPD : Is Spirometry Useful? Chest ,2000,117 (2Suppl) :42s -47s.
7Pinto-Plata VM, Cote C, Cabral H, et al. The 6-rain walk distance: change over time and value as a predictor of survival in severe COPD. Eur Respir J,2004, 23:28 - 33.
8Okudan N, Gok M, Gokbel H, et al. Single dose of tiotropium improves the 6 - minute walk distance in chronic obstructive pulmonary disease. Lung,2006 Jul-Aug, 184 (4) :201 - 204.
9Ferguson GT. Why does the lung hyperinflate? Proc Am Thorac Soc. 2006 Apr;3(2) :176 -9.
10O'Donnell DE. Hyperinflation, dyspnea, and exercise intolerance in chronic obstructive pulmonary disease. Proc Am Thorac Soc, 2006,3(2) :180 - 184.
