[GnRH antagonists and embryo implantation potential]

Area of Science:

• Reproductive Endocrinology
• In Vitro Fertilization

Background:

• Gonadotropin-releasing hormone (GnRH) antagonist regimens are alternatives to GnRH agonist protocols in assisted reproductive technologies.
• Embryo quality assessment is crucial for predicting pregnancy outcomes in IVF.

Purpose of the Study:

• To compare pregnancy and implantation rates between GnRH antagonist and agonist protocols in IVF and ICSI cycles.
• To investigate the influence of specific infertility indications on the efficacy of GnRH antagonist protocols.

Main Methods:

• A non-prospective study analyzed 641 IVF cycles with oocyte retrieval.
• Pregnancy and implantation rates were compared between patients treated with GnRH antagonists and GnRH agonists.
• Embryo quality was assessed using a cumulative embryo score correlating with implantation rates.

Main Results:

• GnRH antagonist protocols were associated with statistically lower pregnancy and implantation rates in conventional IVF cycles compared to GnRH agonist protocols.
• This difference was primarily observed in women with tubal infertility and/or endometriosis.
• No significant difference in outcomes was found between the two protocols in intracytoplasmic sperm injection (ICSI) cycles.

Conclusions:

• GnRH antagonists may not be the optimal choice for IVF cycles in patients with tubal infertility and/or endometriosis.
• Treatment protocols should be individualized based on the specific infertility diagnosis and procedure (IVF vs. ICSI).
• Further research is warranted to elucidate the mechanisms behind the differential response to GnRH antagonists in specific patient subgroups.