title: Does metformin modify ovarian responsiveness during exogenous FSH ovulation induction in normogonadotrophic anovulation? A placebo-controlled double-blind assessment.
abstract: OBJECTIVE
  To assess whether the addition of metformin to gonadotrophin ovulation induction in insulin-resistant, normogonadotrophic, anovulatory women alters ovarian responsiveness to exogenous FSH.
  
  
  METHODS
  Placebo-controlled double-blind assessment in an academic hospital.
  
  
  RESULTS
  After a progestagen withdrawal bleeding, patients were randomised for either metformin (n = 11) or placebo (n = 9) treatment. In cases of absent ovulation, exogenous FSH was subsequently administered to induce ovulation. Only during metformin treatment did body mass index and androgen (androstenedione and testosterone) levels decrease, whereas FSH and LH levels increased significantly. In the metformin group, a single patient ovulated before the initiation of exogenous FSH. Significantly more monofollicular cycles and lower preovulatory oestradiol concentrations were observed in women receiving FSH with metformin compared with FSH alone.
  
  
  CONCLUSIONS
  Metformin co-treatment in a group of insulin-resistant, normogonadotrophic, anovulatory patients resulted in normalization of the endocrine profile and facilitated monofollicular development during the FSH induction of ovulation.
authors.affiliation: Division of Reproductive Medicine, Department of Obstetrics and Gynaecology, Erasmus Medical Centre, Rotterdam, The Netherlands. e.vansantbrink@erasmusmc.nl
authors.forename: Evert J P
authors.initials: EJ
authors.lastname: van Santbrink
authors.forename: Femke P
authors.initials: FP
authors.lastname: Hohmann
authors.forename: Marinus J C
authors.initials: MJ
authors.lastname: Eijkemans
authors.forename: Joop S E
authors.initials: JS
authors.lastname: Laven
authors.forename: Bart C J M
authors.initials: BC
authors.lastname: Fauser
mesh_terms: D000293:Adolescent; D000328:Adult; D000858:Anovulation / Q000188:drug therapy*; D006063:Chorionic Gonadotropin / Q000008:administration & dosage; D004311:Double-Blind Method; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000008:administration & dosage*; D006801:Humans; D008687:Metformin / Q000008:administration & dosage*; D010062:Ovulation Induction / Q000379:methods*; D010919:Placebos
chemical_list: D006063:Chorionic Gonadotropin; D010919:Placebos; D004958:Estradiol; D005640:Follicle Stimulating Hormone; D008687:Metformin