Bibliografia

• Celli BR, Cote CG, Marin JM, Casanova C et al. The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease. N Engl J Med 2004; 350: 1005-12.

• Gross NJ. Outcome measurements in COPD: are we schizophrenic? Chest 2003; 123: 1325-7.

• O’Donnell DE. Assessment of bronchodilator efficacy in symptomatic COPD. Is spirometry useful? CHEST 2000; 117: 42S–47S.

• Rabe KF. Improving dyspnea in chronic obstructive pulmonary disease. Optimal treatment strategies. Proc Am Thorac Soc 2006; 3: 270-5.

• Tashkin D, and Kesten S. Long-term treatment benefits with tiotropium in COPD patients with and without short-term bronchodilator responses. CHEST 2003; 123: 1441-9 .