title: GnRH antagonists in ovarian stimulation: a treatment regimen of clinicians' second choice? Data from the German national IVF registry.
abstract: The place of GnRH antagonists in ovarian stimulation is controversial. Meta-analyses on studies comparing GnRH agonist and GnRH antagonist treatment regimens have suggested a comparatively lower efficacy of GnRH antagonists, which is likely to have influenced clinicians' attitudes. This report describes GnRH antagonist utilization for ovarian stimulation in Germany from 2000-2003. Data from the national IVF registry were analysed. The majority of ovarian stimulation cycles are still performed in long GnRH agonist protocols, although a significant increase in GnRH antagonist usage has been noted (P < 0.0001). Two observations support the notion that GnRH antagonists are often utilized as a treatment option in cycles with an unfavourable a priori prognosis: (i) the proportion of GnRH antagonist cycles increases with cycle rank (P < 0.0001, chi(2) for linear trend); and (ii) GnRH antagonist cycles are more often conducted in older patients as compared to GnRH agonist cycles (P < 0.0001). This has important implications for interpreting clinical performance of GnRH antagonists outside a research context.
authors.affiliation: Department of Obstetrics and Gynecology, University Clinic of Schleswig-Holstein, Campus Luebeck, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Griesinger
authors.forename: Ricardo
authors.initials: R
authors.lastname: Felberbaum
authors.forename: Klaus
authors.initials: K
authors.lastname: Diedrich
mesh_terms: D005260:Female; D005307:Fertilization in Vitro / Q000706:statistics & numerical data; D005858:Germany; D007987:Gonadotropin-Releasing Hormone / Q000037:antagonists & inhibitors*; D006801:Humans; D007247:Infertility, Female / Q000188:drug therapy*; D010062:Ovulation Induction / Q000379:methods / Q000706:statistics & numerical data*; D010818:Practice Patterns, Physicians'; D011247:Pregnancy; D018873:Pregnancy Rate; D012042:Registries / Q000706:statistics & numerical data*
chemical_list: D007987:Gonadotropin-Releasing Hormone