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Related Experiment Videos

Microinjection: choice of embryo transfer technique

R I McLachlan1, G Fuscaldo, I Calderon

  • 1Monash IVF, Richmond, Vic., Australia.

Reproduction, Fertility, and Development
|January 1, 1994
PubMed
Summary

Subzonal sperm microinjection (SUZI) combined with tubal transfer (MIFT) shows promise for male factor infertility, achieving a 24% pregnancy rate. Further trials are needed to confirm MIFT

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Area of Science:

  • Reproductive Medicine
  • Assisted Reproductive Technologies
  • Male Infertility Treatments

Background:

  • Subzonal sperm microinjection (SUZI) is used for severe male factor infertility and repeated fertilization failure.
  • Gamete intrafallopian transfer (GIFT) shows superior pregnancy rates, suggesting a beneficial tubal environment.

Purpose of the Study:

  • To explore the Microinjection-Fallopian Tube transfer (MIFT) procedure, combining SUZI with immediate tubal oocyte transfer.
  • To evaluate the efficacy of MIFT in patients with severe male factor infertility.

Main Methods:

  • Sperm selection via Percoll gradient and stimulation.
  • Injection of 2-10 motile sperm into the oocyte's perivitelline space.
  • Transfer of fertilized oocytes into the Fallopian tube (MIFT) or uterus (TEST).

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Main Results:

  • SUZI in 1992 yielded a 30% fertilization rate and 8.3% pregnancy rate per cycle.
  • An initial MIFT study showed a 24% clinical pregnancy rate per cycle in 21 patients.

Conclusions:

  • MIFT demonstrates a potentially improved pregnancy rate compared to SUZI or TEST.
  • A randomized controlled trial is necessary to validate MIFT's efficacy in severe male factor infertility.