The availability of gonadotropin releasing hormone (GnRH) antagonists did not only offer clinicians an alternative to GnRH agonists but, more importantly, has led to the development of new concepts aiming to increase safety and simplicity in ovarian stimulation. These include the modified natural cycle, mild in vitro fertilization (IVF), the use of GnRH agonist for triggering of final oocyte maturation with elective cryopreservation in patients at risk of developing ovarian hyperstimulation syndrome (OHSS), the administration of antagonists during the luteal phase for management of severe OHSS, as well as control of endogenous luteinizing hormone (LH) with GnRH antagonists in intrauterine insemination (IUI) cycles. Administration of GnRH antagonists can be performed by either a single dose or by using a daily scheme. The need to simplify ovarian stimulation led to the development of long-acting follicle stimulating hormone (FSH).

Original languageEnglish
Title of host publicationHuman Assisted Reproductive Technology: Future Trends in Laboratory and Clinical Practice
Number of pages7
PublisherCambridge University Press
Publication date01.01.2011
ISBN (Print)9781107001121
ISBN (Electronic)9780511734755
Publication statusPublished - 01.01.2011


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