title: Altered uterine artery blood flow impedance after danazol therapy: possible mode of action in dysfunctional uterine bleeding.
abstract: OBJECTIVE
  To test the hypothesis that danazol increases the impedance to uterine circulation and hence reduces the effective uterine blood flow after a predetermined period of therapy.
  
  
  METHODS
  Prospective, longitudinal study.
  
  
  METHODS
  Reproductive medicine unit of a university teaching hospital.
  
  
  METHODS
  Eight premenopausal women with dysfunctional uterine bleeding.
  
  
  METHODS
  Six weeks of danazol therapy.
  
  
  METHODS
  The uterine artery blood flow impedance as indicated by the pulsatility and resistance indices; the hormonal profile (E2, FSH, and LH levels); the uterine dimensions (length, width, anteroposterior diameter, and area); and the endometrial thickness.
  
  
  RESULTS
  The indices of uterine artery impedance were significantly increased after danazol therapy, indicating a possible reduction in the effective uterine artery blood flow. There was no statistically significant change in the hormonal profile, uterine dimensions, or endometrial thickness.
  
  
  CONCLUSIONS
  Danazol therapy for 6 weeks results in a significant increase in the uterine artery impedance and hence a possible reduction in the effective uterine artery blood flow. This may explain in part its efficacy in the management of dysfunctional uterine bleeding and in the preoperative preparation of women undergoing endoscopic endometrial ablation. The exact mechanism for its action in this regard remains to be determined but appears to be independent of E2 levels. This preliminary finding may help in monitoring the treatment of dysfunctional uterine bleeding, preoperative and postoperative investigation of women undergoing endoscopic endometrial ablation, and the development of alternative treatment strategies for dysfunctional uterine bleeding in the future.
authors.affiliation: Academic Department of Obstetrics and Gynaecology, University of Manchester, England, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Pepper
authors.forename: P J
authors.initials: PJ
authors.lastname: Dewart
authors.forename: O A
authors.initials: OA
authors.lastname: Oyesanya
mesh_terms: D000328:Adult; D001158:Arteries / Q000000981:diagnostic imaging / Q000187:drug effects / Q000502:physiology*; D003613:Danazol / Q000494:pharmacology* / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D011446:Prospective Studies; D012039:Regional Blood Flow / Q000187:drug effects; D018615:Ultrasonography, Doppler, Color; D014592:Uterine Hemorrhage / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*; D014599:Uterus / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000187:drug effects
chemical_list: D003613:Danazol