title: Gonadotropin-releasing hormone agonists versus antagonists for controlled ovarian hyperstimulation in oocyte donors: a systematic review and meta-analysis.
abstract: OBJECTIVE
  To compare GnRH agonists and antagonists in oocyte-donation IVF treatment cycles by a systematic review and meta-analysis of trials.
  
  
  METHODS
  Systematic review and meta-analysis of randomized clinical trials (RCT). Systematic literature searches were conducted, and all randomized trials that compared GnRH agonists with antagonists in oocyte-donation IVF treatment cycles were included. Study selection, quality appraisal, and data extractions were performed independently and in duplicate.
  
  
  METHODS
  Tertiary fertility center.
  
  
  METHODS
  A total of 1,024 oocyte donors treated in eight RCTs.
  
  
  METHODS
  Comparison of GnRH agonists versus antagonists in oocyte-donation IVF treatment.
  
  
  METHODS
  Ongoing pregnancy, oocytes retrieved, duration of stimulation, gonadotropin consumption, and ovarian hyperstimulation syndrome incidence (OHSS) per randomized oocyte donor.
  
  
  RESULTS
  Meta-analysis of these studies showed no significant difference in ongoing pregnancy rate between the GnRH agonists and antagonists (risk ratio [RR] 1.15, 95% confidence interval [CI] 0.97 to 1.36). The duration of stimulation was significantly lower with the GnRH antagonist protocol (weighed mean difference [WMD] -0.90 days, 95% CI -1.61 to -0.20). No significant differences were observed in the number of oocytes retrieved (WMD -0.60, 95% CI -2.26 to +1.07), gonadotropin consumption (WMD -264 IU, 95% CI -682 to +154), or OHSS incidence (RR 0.62, 95% CI 0.18 to 2.15).
  
  
  CONCLUSIONS
  No significant differences were observed in ongoing pregnancy rate or the number of retrieved oocytes after donor stimulation with GnRH agonist or antagonist protocols.
authors.affiliation: Clínica Eugin, Departament de Pediatria, Obstetrícia i Ginecologia i Medicina Preventiva, Universitat Autònoma de Barcelona, Barcelona, Spain. bodridaniel@gmail.com
authors.forename: Daniel
authors.initials: D
authors.lastname: Bodri
authors.forename: Sesh Kamal
authors.initials: SK
authors.lastname: Sunkara
authors.forename: Arri
authors.initials: A
authors.lastname: Coomarasamy
mesh_terms: D005260:Female; D005307:Fertilization in Vitro; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists* / Q000037:antagonists & inhibitors*; D006801:Humans; D018587:Oocyte Donation / Q000379:methods*; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D018873:Pregnancy Rate; D016032:Randomized Controlled Trials as Topic
chemical_list: D007987:Gonadotropin-Releasing Hormone