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Embryo viability associated with microassisted fertilization

D Payne1

  • 1Department of Obstetrics and Gynaecology, University of Adelaide, Queen Elizabeth Hospital, Woodville, South Australia.

Bailliere'S Clinical Obstetrics and Gynaecology
|March 1, 1994
PubMed
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Assisted reproductive technologies like intracytoplasmic sperm injection (ICSI) and partial zona dissection (PZD) can produce viable embryos for treating infertility. However, zona drilling with Tyrode's solution is harmful and should be avoided.

Area of Science:

  • Reproductive biology
  • In vitro fertilization
  • Embryology

Background:

  • Embryo morphology and cleavage rates are indicators of embryo viability but are not absolute measures.
  • Oocyte and embryo chromosomal abnormalities impact viability and can be reflected in morphology.
  • Microassisted fertilization techniques are crucial for treating severe male-factor infertility.

Purpose of the Study:

  • To evaluate the viability and developmental competence of embryos created using various assisted reproductive techniques.
  • To assess the impact of different zona pellucida manipulation methods on oocyte and embryo quality.
  • To determine the safety and efficacy of intracytoplasmic sperm injection (ICSI) and partial zona dissection (PZD).

Main Methods:

  • Comparison of embryo viability, pregnancy rates, and implantation rates between different assisted reproductive techniques.

Related Experiment Videos

  • Assessment of oocyte and embryo morphology following zona drilling, partial zona dissection (PZD), and subzonal insertion (SUZI).
  • Evaluation of fertilization and developmental competence after intracytoplasmic sperm injection (ICSI).

    • Main Results:

    • Zona drilling using acidified Tyrode's solution is detrimental to oocyte and embryo viability.
    • Partial zona dissection (PZD) produces viable embryos with developmental competence comparable to routine IVF embryos, provided oocytes are pre-shrunk.
    • Subzonal insertion (SUZI) embryos show viability comparable to routine IVF embryos.
    • Intracytoplasmic sperm injection (ICSI) does not negatively affect fertilization or developmental competence, yielding excellent clinical pregnancy rates.

    Conclusions:

    • Microassisted fertilization techniques, including ICSI and PZD (with proper oocyte preparation), are effective for treating infertility.
    • Certain zona manipulation methods, like zona drilling with Tyrode's solution, should be avoided due to adverse effects on embryo viability.
    • Intracytoplasmic sperm injection (ICSI) is a safe and effective method for achieving high clinical pregnancy rates.