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Evolution of arterial oxygen tension (Pao2) and mean pulmonary artery pressure (PAP) in a series of chronic obstructive pulmonary disease patients investigated during acute exacerbations and after recovery. The pronounced improvement in Pao2 (from mean 38 mm Hg to 53 mm Hg) is accompanied by a profound decrease in PAP (from mean 44 mm Hg to 27 mm Hg).
