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University of Bologna, Bologna, Italy.
Circulation 2009;119:2894–903.
Editor’s note: Current treatments for pulmonary arterial hypertension (PAH) work to improve patients’ symptoms, exercise capacity, and clinical outcome, but are limited by inconvenient delivery systems, requirements for laboratory monitoring, and dosing schedules that are too frequent. Consequently, there is a need to find a convenient, yet safe and effective, oral, once-daily therapy for the treatment of PAH. Previous studies have shown that the phosphodiesterase type 5 inhibitor sildenafil improves exercise capacity and hemodynamic parameters in patients with PAH.