title: Comparison of multiple dose GnRH antagonist and minidose long agonist protocols in poor responders undergoing in vitro fertilization: a randomized controlled trial.
abstract: OBJECTIVE
  To investigate the efficacy of gonadotropin releasing hormone antagonist (GnRH) in poor responders undergoing in vitro fertilization.
  
  
  METHODS
  Ninety-six patients with poor ovarian response in previous treatment cycles were prospectively randomized into two groups. Forty-four patients were stimulated with GnRH antagonist multidose protocol and 45 patients received a standard long agonist protocol. Ovarian response was evaluated by transvaginal ultrasound and hormonal parameters. Cycle characteristics and treatment outcomes were statistically compared between groups.
  
  
  RESULTS
  There was significantly reduced duration of stimulation and consumption of gonadotrophins in the antagonist group when compared to the agonist group. The estradiol concentrations on the day of human chorionic gonadotropin (hCG) injection, the number of oocytes retrieved, and the number of embryos transferred were similar for both groups. In the antagonist group, eight (18.1%) ongoing pregnancies were achieved and in the agonist group, ten (22.2%) clinical pregnancies were achieved but the difference was not statistically significant.
  
  
  CONCLUSIONS
  The present study was not powered to detect clinically relevant differences between two protocols in outcomes such as pregnancy rate, with confidence.
authors.affiliation: Department of Obstetric and Gynecology, Meram Medical Faculty, Selçuk University, Meram, Konya, Turkey.
authors.forename: Aybike
authors.initials: A
authors.lastname: Tazegül
authors.forename: Hüseyin
authors.initials: H
authors.lastname: Görkemli
authors.forename: Suna
authors.initials: S
authors.lastname: Ozdemir
authors.forename: T Murad
authors.initials: TM
authors.lastname: Aktan
mesh_terms: D000328:Adult; D015331:Cohort Studies; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D005300:Fertility Agents, Female / Q000008:administration & dosage*; D005307:Fertilization in Vitro; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000031:analogs & derivatives*; D006727:Hormone Antagonists / Q000008:administration & dosage*; D006801:Humans; D016729:Leuprolide / Q000008:administration & dosage*; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D011256:Pregnancy Outcome
chemical_list: D005300:Fertility Agents, Female; D006727:Hormone Antagonists; D007987:Gonadotropin-Releasing Hormone; D016729:Leuprolide; C061018:ganirelix; C062876:cetrorelix