title: GnRH antagonists in ovarian stimulation for ICSI with oocyte restriction: a matched, controlled study.
abstract: Italian legislation regarding reproductive medicine limits the number of embryos transferred per attempt to three. Thus, in order to achieve pregnancy, more IVF cycles may be required, generating a need for methods of ovarian stimulation with fewer side effects. The gonadotrophin-releasing hormone (GnRH) antagonists have several advantages in this respect, but there is a debate regarding a possible lower pregnancy rate from resulting cycles. This study evaluated the clinical applicability of GnRH antagonists for ovarian stimulation in young women undergoing intracytoplasmic sperm injection (ICSI) in which only three oocytes can be fertilized. The 200 women treated with GnRH antagonist had a significantly shorter stimulation and lower gonadotrophin consumption, oestradiol concentration, total and mature oocyte recovery as compared with 200 matched controls treated with GnRH agonist. No differences were found between the groups in the number of normal zygotes, total cleaved, transferred and high quality embryos, or in the clinical outcomes. Thus, the previously reported lower pregnancy rate in GnRH antagonist cycles may be related to the oocyte characteristics. Finally, under conditions of oocyte number restriction, the GnRH antagonist-based cycles may be proposed as an efficacious, safe and minimally invasive alternative to GnRH agonist in a standard long protocol.
authors.affiliation: Assisted Reproduction Centre, European Hospital, Via Portuense 700, 00149 Rome, Italy. ergreco1@virgillo.it
authors.forename: E
authors.initials: E
authors.lastname: Greco
authors.forename: K
authors.initials: K
authors.lastname: Litwicka
authors.forename: S
authors.initials: S
authors.lastname: Ferrero
authors.forename: E
authors.initials: E
authors.lastname: Baroni
authors.forename: F
authors.initials: F
authors.lastname: Sapienza
authors.forename: L
authors.initials: L
authors.lastname: Rienzi
authors.forename: S
authors.initials: S
authors.lastname: Romano
authors.forename: M G
authors.initials: MG
authors.lastname: Minasi
authors.forename: J
authors.initials: J
authors.lastname: Tesarik
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists / Q000037:antagonists & inhibitors*; D006801:Humans; D007558:Italy; D007883:Legislation, Medical; D008297:Male; D016555:Matched-Pair Analysis; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D020554:Sperm Injections, Intracytoplasmic
chemical_list: D007987:Gonadotropin-Releasing Hormone