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Related Experiment Videos

Elevated E2: oocyte ratio in women undergoing IVF and tubal ET. Correlation with a decrease in the implantation rate.

J H Yang1, H F Chen, Y R Lien

  • 1Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.

The Journal of Reproductive Medicine
|June 9, 2001
PubMed
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High estradiol (E2) to oocyte ratios in in vitro fertilization and tubal embryo transfer (IVF-TET) cycles are linked to lower pregnancy and implantation success. This suggests elevated E2 may negatively impact endometrial receptivity, affecting reproductive outcomes.

Area of Science:

  • Reproductive Endocrinology
  • In Vitro Fertilization Research
  • Clinical Embryology

Background:

  • Estradiol (E2) levels are monitored during ovarian stimulation in assisted reproductive technologies.
  • The optimal estradiol (E2) to oocyte ratio for predicting IVF-TET success is not well-established.
  • Understanding this ratio's impact is crucial for optimizing IVF-TET protocols.

Purpose of the Study:

  • To evaluate the effect of varying estradiol (E2) to oocyte ratios on reproductive outcomes in women undergoing IVF-TET.
  • To determine if specific E2: oocyte ratios correlate with higher or lower success rates.
  • To identify potential mechanisms linking E2: oocyte ratios to reproductive outcomes.

Main Methods:

  • Retrospective analysis of 251 IVF-TET cycles from 207 women.

Related Experiment Videos

  • All participants underwent ovarian hyperstimulation using a GnRH agonist flare protocol.
  • Oocyte retrieval and tubal embryo transfer (TET) timing were standardized.

    • Main Results:

    • Cycles with an E2: oocyte ratio ≥ 350 pg/mL showed higher E2 levels and fertilization rates but fewer oocytes retrieved.
    • Significantly lower pregnancy rates (17.9% vs. 32.8%) were observed in cycles with E2: oocyte ratio ≥ 350 pg/mL.
    • Implantation rates were also significantly decreased (5.3% vs. 12.9%) in the higher E2: oocyte ratio group.

    Conclusions:

    • Elevated E2: oocyte ratios in IVF-TET cycles are associated with reduced pregnancy and implantation rates.
    • High estradiol concentrations may adversely affect endometrial receptivity, contributing to poor reproductive outcomes.
    • Further research is needed to elucidate the precise mechanisms and clinical implications of E2: oocyte ratios.