title: Sildenafil in the treatment of erectile dysfunction after radical prostatectomy.
abstract: OBJECTIVE
  To evaluate the efficacy of sildenafil for the treatment of erectile dysfunction after radical prostatectomy and to determine whether age, preservation of the neurovascular bundles (NVBs), or the interval between surgery and the initiation of sildenafil therapy influences the response to sildenafil.
  
  
  METHODS
  We began this study in April 1998, immediately after the Food and Drug Administration approved sildenafil. We surveyed 170 men who had undergone radical retropubic prostatectomy, had not recovered natural erections sufficient for intercourse, and subsequently received sildenafil between 3 and 24 months postoperatively. The data were collected through a confidential mail survey conducted by a clinical nurse. The men used a dose of 50 mg sildenafil and increased this to 100 mg if they did not obtain an adequate response.
  
  
  RESULTS
  In the 120 men who began taking sildenafil at least 12 months after surgery, the overall response rate was 29%. Results varied markedly by patient age and number of NVBs preserved. In men younger than 55 years in whom both NVBs had been preserved, the response rate was 80%. In contrast, no patient older than 55 years in whom only one NVB had been preserved reported an adequate response. Regardless of age, no patient in whom both NVBs had been excised reported success with sildenafil. Of the 50 patients who began taking sildenafil less than 9 months after surgery and who had not recovered natural sexual function, none reported erections adequate for intercourse using sildenafil.
  
  
  CONCLUSIONS
  Sildenafil is an effective treatment for men with erectile dysfunction after radical retropubic prostatectomy, particularly in younger men in whom both NVBs have been preserved. It is ineffective in men in whom both NVBs have been excised, and it is also ineffective in older men in whom only one NVB has been preserved. Sildenafil appears ineffective in the first 9 months after prostatectomy.
authors.affiliation: Department of Surgery (Section of Urology), University of Chicago Medical Center, Chicago, Illinois, USA.
authors.forename: G P
authors.initials: GP
authors.lastname: Zagaja
authors.forename: D A
authors.initials: DA
authors.lastname: Mhoon
authors.forename: J E
authors.initials: JE
authors.lastname: Aikens
authors.forename: C B
authors.initials: CB
authors.lastname: Brendler
mesh_terms: D000367:Age Factors; D000368:Aged; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000209:etiology; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D010410:Penile Erection / Q000187:drug effects*; D010413:Penis / Q000294:innervation; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use*; D010879:Piperazines / Q000627:therapeutic use*; D011468:Prostatectomy / Q000009:adverse effects*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate