Vardenafil in Pulmonary Arterial Hypertension: A Randomized, Double-blind, Placebo-controlled Study

Although the phosphodiesterase type 5 inhibitors sildenafil and tadalafil have demonstrated efficacy in patients with pulmonary arterial hypertension (PAH), monotherapy with these agents has not been conclusively shown to reduce clinical worsening events. To evaluate the safety and efficacy of the p...

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