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Intracytoplasmic sperm injection in dysmorphic human oocytes

M Alikani1, G Palermo, A Adler

  • 1Institute for Reproductive Medicine and Science, West Orange, New Jersey 07052, USA.

Zygote (Cambridge, England)
|November 1, 1995
PubMed
Summary
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Dysmorphic human oocytes, often a result of ovarian stimulation, do not impact fertilization rates during intracytoplasmic sperm injection (ICSI). However, embryos from these oocytes may have a reduced potential for implantation and development.

Area of Science:

  • Reproductive Biology
  • In Vitro Fertilization
  • Embryology

Background:

  • Controlled ovarian stimulation can lead to oocyte morphological abnormalities.
  • Previous studies suggested a link between oocyte dysmorphisms and fertilization failure.

Purpose of the Study:

  • To evaluate the impact of dysmorphic human oocytes on fertilization and early development after intracytoplasmic sperm injection (ICSI).
  • To assess the relationship between oocyte morphology and pregnancy outcomes.

Main Methods:

  • Analysis of 2968 oocytes (27.2% dysmorphic) undergoing ICSI.
  • Microscopic evaluation of oocyte morphology, including cytoplasmic and structural anomalies.
  • Comparison of fertilization rates, pregnancy, and implantation outcomes between dysmorphic and non-dysmorphic oocytes.

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Main Results:

  • No significant reduction in fertilization rates was observed in dysmorphic oocytes, regardless of the number of abnormalities.
  • Overall pregnancy and implantation rates were not affected in patients with at least one dysmorphic oocyte.
  • Exclusive transfer of embryos from dysmorphic oocytes resulted in a higher rate of early pregnancy loss.

Conclusions:

  • Oocyte morphological aberrations, likely from ovarian stimulation, have minimal impact on fertilization and early cleavage post-ICSI.
  • Embryos derived from dysmorphic oocytes may have a diminished potential for successful implantation and sustained development.