Snapshot A 60-year-old man presents to his primary care physician for evaluation of erectile dysfunction. His wife died 5 years ago and he would like to start dating again. He denies having any life stressors. He reports having no morning or night-time erections. His past medical history includes hyperlipidemia managed with medication and pre-diabetes managed with an active lifestyle and diet. His physician sends him for further laboratory workup and counsels him on the use of sildenafil. Introduction Clinical definition login to view 1 more bullet Etiology Primary erectile dysfunction with normal functioning penis login to view 9 more bullets Secondary erectile dysfunction with an abnormally functioning penis login to view 14 more bullets Pathogenesis login to view 5 more bullets Associated conditions login to view 2 more bullets Epidemiology Incidence increases with age Demographics login to view 1 more bullet Risk factors login to view 5 more bullets Presentation Symptoms login to view 4 more bullets Physical exam login to view 1 more bullet Studies Labs login to view 8 more bullets Nocturnal penile tumescence and rigidity test login to view 1 more bullet Differential Premature ejaculation Treatment Conservative login to view 6 more bullets Medical login to view 7 more bullets Operative login to view 3 more bullets Complications Relationship problems Prognosis Natural history of disease login to view 1 more bullet