title: Comparison of GnRH agonists and antagonists in unselected IVF/ICSI patients treated with different controlled ovarian hyperstimulation protocols: a matched study.
abstract: OBJECTIVE
  To evaluate the results of the use of GnRH antagonist (GnRHant) and GnRH analog (GnRHa) in two matched groups of unselected IVF/ICSI patients in a retrospective matched pair analysis.
  
  
  METHODS
  Patients (n=52) were stimulated with human menopausal gonadotropin (hMG) and/or recombinant FSH (rFSH). In Group I (n=26) a daily dose of 0.25mg of Cetrorelix (GnRHant) was administered when follicles reached a diameter of > or = 14 mm. Patients in Group II (n=26) were first desensitized with GnRHa triptorelin long protocol, which was continued during the gonadotropins treatment until the induction of ovulation.
  
  
  RESULTS
  In both groups, serum LH levels remained low during the stimulation. The mean length of stimulation, and the dose of FSH required per patient were similar in both groups. The mean E2 level on day of hCG administration was significantly higher in the patients of Group II (2076+/-1430 versus 1145+/-605 pg/ml), however, a progressive increase in serum E2 concentration during the cycle was noted in both groups. A median of 5.38 and 6.34 mature oocytes per patient was obtained, and the fertilization rate was 59.3% in Group I and 63.6% in Group II. Pregnancy rate (PR) were better in Group II (15 versus 5%), and no severe or moderate ovarian hyperstimulation syndrome (OHSS) occurred.
  
  
  CONCLUSIONS
  GnRHant and GnRHa provide comparable results in unselected patients, while GnRHant allows a higher flexibility in the treatment.
authors.affiliation: Universitäts Frauenklinik Erlangen, Universitäts str. 21-23, D-91054 Erlangen, Germany.
authors.forename: Juan C Barros
authors.initials: JC
authors.lastname: Del Gadillo
authors.forename: Ernst
authors.initials: E
authors.lastname: Siebzehnrübl
authors.forename: Ralf
authors.initials: R
authors.lastname: Dittrich
authors.forename: Ludwig
authors.initials: L
authors.lastname: Wildt
authors.forename: Norbert
authors.initials: N
authors.lastname: Lang
mesh_terms: D004624:Embryo Transfer; D004958:Estradiol / Q000097:blood; D005260:Female; D005307:Fertilization in Vitro; D005640:Follicle Stimulating Hormone / Q000008:administration & dosage; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000819:agonists* / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors*; D006801:Humans; D007246:Infertility / Q000628:therapy; D007986:Luteinizing Hormone / Q000097:blood; D008596:Menotropins / Q000008:administration & dosage; D006080:Ovarian Follicle / Q000033:anatomy & histology; D010062:Ovulation Induction / Q000379:methods*; D011994:Recombinant Proteins / Q000008:administration & dosage; D012189:Retrospective Studies; D020554:Sperm Injections, Intracytoplasmic
chemical_list: D011994:Recombinant Proteins; D007987:Gonadotropin-Releasing Hormone; D004958:Estradiol; D008596:Menotropins; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; C062876:cetrorelix