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Resting and exercising pulmonary artery mean pressure (PAP) in a large series of chronic obstructive pulmonary disease patients (results are in mm Hg). Group 1: resting PAP < 20 mm Hg and exercising PAP < 30 mm Hg. Group 2: resting PAP < 20 mm Hg and exercising PAP > 30 mm Hg. Group 3: resting PAP > 20 mm Hg (pulmonary hypertension).
