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Related Experiment Videos

GnRH antagonists in IVF.

Efstratios M Kolibianakis1, Basil Tarlatzis, Paul Devroey

  • 1Unit for Human Reproduction, 1st Department of Obstetrics and Gynaecology, Aristotle University, Thessaloniki, Greece. Stratis.Kolibianakis@otenet.gr

Reproductive Biomedicine Online
|June 23, 2005
PubMed
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Gonadotropin-releasing hormone (GnRH) antagonists show promise, but prolonging the follicular phase or starting stimulation with elevated progesterone reduces pregnancy chances. Luteal support is essential.

Area of Science:

  • Reproductive Endocrinology
  • Infertility Treatments
  • Assisted Reproductive Technology (ART)

Background:

  • Review of current knowledge on gonadotropin-releasing hormone (GnRH) antagonists.
  • Experience from phase III comparative trials with GnRH agonists.
  • Understanding factors influencing pregnancy rates in ART.

Purpose of the Study:

  • To summarize existing data on GnRH antagonist use in fertility treatments.
  • To evaluate the impact of specific protocols and patient factors on pregnancy outcomes.
  • To provide evidence-based insights for optimizing ART protocols.

Main Methods:

  • Systematic review of published literature and clinical trial data.
  • Analysis of comparative trials involving GnRH antagonists and agonists.

Related Experiment Videos

  • Evaluation of patient-specific factors, including progesterone levels and follicular phase duration.

    • Main Results:

    • Prolonging the follicular phase is associated with a decreased probability of pregnancy.
    • Elevated progesterone levels at the start of stimulation significantly reduce ongoing pregnancy chances.
    • Luteal support is confirmed as mandatory; replacing human chorionic gonadotropin with GnRH agonists is not feasible.

    Conclusions:

    • Current data do not support increasing gonadotropin dosage, LH supplementation, or flexible antagonist protocols.
    • Careful patient selection and protocol optimization are crucial for successful ART outcomes.
    • GnRH antagonists offer a valuable option in ART, but specific parameters require further investigation.