title: Double-blind randomized crossover study comparing intracorporeal prostaglandin E1 with combination of prostaglandin E1 and lidocaine in the treatment of organic impotence.
abstract: OBJECTIVE
  To study the efficacy of lidocaine 1% in relieving pain associated with intracorporeal prostaglandin E1 and to assess its effect on the pharmacological erection.
  
  
  METHODS
  Twenty-two patients who had previously experienced pain with intracorporeal prostaglandin E1 injections were submitted to a double-blind randomized crossover study to evaluate comparatively the effects of intracorporeal prostaglandin E1 alone and in combination with lidocaine. The signed rank test was used for statistical analysis of the results.
  
  
  RESULTS
  With prostaglandin E1 monotherapy (20 micrograms) 86.3% of patients experienced pain and 27.2% had an adequate erection. With combination therapy (prostaglandin E1 20 micrograms plus lidocaine 1% 1 cc) 45.4% of patients experienced pain and 57.8% of patients had improvement of pain compared with prostaglandin E1 monotherapy. The adequate erectile response rate with combination therapy was 63.6%; in addition, 31.8% of patients noted enhancement in the duration of erection. The signed rank test was significant for the pain response (P < 0.01) and for the degree of erection (P < 0.01). The signed rank test was not, however, significant for the increase in duration of erection after combination therapy. No significant side effects were noted after either injection.
  
  
  CONCLUSIONS
  Lidocaine 1% can be safely and usefully combined with intracorporeal prostaglandin E1 in the treatment of erectile dysfunction with alleviation of pain and enhancement of erectile effect.
authors.affiliation: Department of Surgery, King Saud University, Riyadh, Saudi Arabia.
authors.forename: S
authors.initials: S
authors.lastname: Kattan
mesh_terms: D000328:Adult; D000527:Alprostadil / Q000009:adverse effects* / Q000627:therapeutic use; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D007172:Erectile Dysfunction / Q000188:drug therapy*; D006801:Humans; D007267:Injections; D008012:Lidocaine / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000139:chemically induced / Q000517:prevention & control*; D010410:Penile Erection / Q000187:drug effects
chemical_list: D008012:Lidocaine; D000527:Alprostadil