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Pulmonary hypertension (PH) is a well-known independent prognostic factor in chronic obstructive pulmonary disease (COPD) and a sufficient criterion for lung transplant candidacy. Limited data are currently available on the hemodynamic and clinical effect of phosphodiesterase 5 inhibitors in patients with severe PH associated with COPD. This study assessed the effect of sildenafil on pulmonary hemodynamics...
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