title: Clinical predictive factors of sildenafil response: a penile hemodynamic study.
abstract: Phosphodiestrase-5 inhibitors are an important line of treatment for erectile dysfunction (ED). To detect the clinical and hemodynamic predictors of sildenafil response, we conducted this study on 124 Egyptian men with ED. All patients were evaluated by thorough history and clinical assessment with measurement of the abridged international index of erectile function-5 (IIEF-5) score. All patients were then subjected to intracavernosal injection (ICI) of trimix and pharmaco-penile duplex ultrasonography (PPDU). Patients were then classified into sildenafil responders and non-responders after six consecutive doses of 100 mg sildenafil. On doing the binary logistic stepwise regression analysis, only ED duration, IIEF-5 score, and response to ICI were the significant independent predictors of sildenafil response. These three parameters together correctly predicted the sildenafil response by 81.5% (p value <0.001). With the receiver operator characteristic curve analysis, the cut-off value of ED duration was 2.5 years and it was 14 for the IIEF-5 score. These findings indicate that ED duration, the IIEF-5 score and response to ICI are more significant predictors of sildenafil response than the more expensive and time-consuming PPDU testing.
authors: Andrology Unit, Mansoura University Hospital, Mansoura Faculty of Medicine, Mansoura, Egypt.
authors: S M
authors: SM
authors: Elhanbly
authors: A A-M
authors: AA
authors: Elkholy
authors: M
authors: M
authors: Alghobary
authors: M
authors: M
authors: Abou Al-Ghar
mesh_terms: D000328:Adult; D006439:Hemodynamics / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010413:Penis / Q000098:blood supply / Q000187:drug effects*; D058986:Phosphodiesterase 5 Inhibitors / Q000494:pharmacology*; D000068677:Sildenafil Citrate / Q000494:pharmacology*
chemical_list: D058986:Phosphodiesterase 5 Inhibitors; D000068677:Sildenafil Citrate
keywords: PDE-5 inhibitors; erectile dysfunction; predictive factors; sildenafil