title: [Alveolar-arterial gradient of oxygen in COPD patients].
authors.forename: S A
authors.initials: SA
authors.lastname: Santamarîa Herrero
mesh_terms: D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D010101:Oxygen Consumption; D011659:Pulmonary Gas Exchange