Objectives: To evaluate the outcome of treatment in patients with erectile dysfunction (ED) using sildenafil or intracavernosal injection of prostaglandin E1(PGE1).

• 目的:比较口服西地那非与阴茎海绵体内注射前列腺素E1(PGE1)治疗勃起功能障碍(ED)的疗效。