title: Letter: Acid-base response in COPD.
mesh_terms: D000136:Acid-Base Equilibrium; D001639:Bicarbonates / Q000097:blood; D002245:Carbon Dioxide / Q000097:blood*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000097:blood / Q000503:physiopathology*
chemical_list: D001639:Bicarbonates; D002245:Carbon Dioxide