title: The effect of an individualized GnRH antagonist protocol on folliculogenesis in IVF/ICSI.
abstract: BACKGROUND
  The aim of this study was to assess the effect of an individualized GnRH antagonist regimen on folliculogenesis.
  
  
  METHODS
  In a multicentre, randomized, clinical trial, IVF/ICSI patients were allocated to a standard regimen, in which they received daily 0.25 mg GnRH antagonist ganirelix (Orgalutran) from the 6th day of stimulation onward (fixed regimen n = 102) or to an individualized regimen, in which IVF/ICSI patients received daily 0.25 mg GnRH antagonist starting on the day that the dominant follicle had reached a diameter of > or = 15 mm (flexible regimen n = 103). The primary endpoint was to assess the difference in the total number of oocytes.
  
  
  RESULTS
  The mean (SD) number of retrieved oocytes was not statistically significantly different: 9.4 (5.8) in the flexible group versus 9.7 (6.5) in the fixed group. The clinical and ongoing pregnancy rates were 22.7 and 21.8% respectively in the flexible group versus 33 and 31.1% in the fixed group [relative rate ratio 0.69 (95% confidence interval 0.44-1.08) and 0.7 (0.44-1.12) respectively].
  
  
  CONCLUSIONS
  The individualized flexible regimen did not result in an increase in the total number of oocytes obtained.
authors.affiliation: m.h.mochtar@amc.uva.nl
authors.forename: M H
authors.initials: MH
authors.lastname: Mochtar
mesh_terms: D005260:Female; D005307:Fertilization in Vitro; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D006727:Hormone Antagonists / Q000008:administration & dosage*; D006801:Humans; D009865:Oocytes / Q000187:drug effects; D006080:Ovarian Follicle / Q000166:cytology / Q000187:drug effects*; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D018873:Pregnancy Rate; D020554:Sperm Injections, Intracytoplasmic; D016896:Treatment Outcome
chemical_list: D006727:Hormone Antagonists; D007987:Gonadotropin-Releasing Hormone; C061018:ganirelix