title: Clinical outcomes using a flexible regimen of GnRH-antagonists and a 'step-up' of additional gonadotropins in donor oocyte cycles.
abstract: OBJECTIVE
  To assess the impact of serum estradiol upon oocyte donor cycle stimulation characteristics and clinical outcomes using flexible GnRH-antagonist (GnRH-ant) with additional FSH supplementation.
  
  
  METHODS
  A retrospective chart review of 99 oocyte donor cycles using ovarian hyperstimulation with recombinant FSH (rFSH) and GnRH-ant was analyzed. Following discontinuation of oral contraceptives, controlled ovarian hyperstimulation was begun using rFSH (150-300 IU daily). GnRH-ant (ganirelix, Organon) and an additional 75 IU of FSH/day were begun when lead follicles were 13-14 mm in greatest diameter. Cycles were analyzed based on serum estradiol response following administration of GnRH-ant (Group 1: progressive rise and Group 2: no rise or a decline). Primary endpoints were cycle stimulation characteristics based on serum estradiol following GnRH-ant, clinical pregnancy and implantation rates.
  
  
  RESULTS
  A decline in serum estradiol was seen after GnRH-ant administration in 45% of cycles. Clinical pregnancy rates per transfer (70 vs. 72%) and implantation rates (43 vs. 56%) were similar for each group.
  
  
  CONCLUSIONS
  Flexible regimens of GnRH-ant even with additional rFSH in a 'step-up' fashion frequently result in a decline in serum estradiol during ovulation induction. While our study is non-randomized, it does not appear to result in any adverse affect in clinical outcomes in donor oocyte cycles.
authors: Good Samaritan Hospital, Cincinnati, OH, USA.
authors: M A
authors: MA
authors: Barker
authors: M S
authors: MS
authors: Christianson
authors: C M
authors: CM
authors: Schouweiler
authors: S R
authors: SR
authors: Lindheim
mesh_terms: D000328:Adult; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000037:antagonists & inhibitors*; D006062:Gonadotropins / Q000008:administration & dosage*; D006801:Humans; D008875:Middle Aged; D009865:Oocytes / Q000637:transplantation*; D011247:Pregnancy; D018873:Pregnancy Rate; D014019:Tissue Donors; D016896:Treatment Outcome
chemical_list: D006062:Gonadotropins; D007987:Gonadotropin-Releasing Hormone