??? ?? ???? ?? ??? ???? ???. ????? ??? ??? ??? ???? ?? ?? ?????. ???, ???? ?? ??? ???? ?? ?? ?? ??? ???? ???.?????? ??? ??? ??? ?? ???? ???? ?? ? ???, ??? ????? ??? ???? ??? ?????.Even though sildenafil improves some markers of ailment in people with pulmonary arterial hypertension, it doesn't seem to have an effect on the potential