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Sub-zonal insemination for extreme male factor infertility
J Lippi1, D Mortimer, R P Jansen
1Sydney IVF, NSW, Australia.
Human Reproduction (Oxford, England)
|June 1, 1993
Summary
Sub-zonal insemination (SZI) offers a solution for severe male infertility by overcoming sperm-oocyte interaction barriers. This method achieved a 14.5% pregnancy rate per embryo transfer in extreme male factor patients.
Area of Science:
- Reproductive Medicine
- Assisted Reproductive Technology
- Andrology
Background:
- The zona pellucida presents a significant barrier to sperm-oocyte interaction in in-vitro fertilization (IVF).
- Severe male infertility, defined by fertilization failure or very low motile sperm counts (<50,000), requires advanced techniques.
Purpose of the Study:
- To evaluate the efficacy of sub-zonal insemination (SZI) for patients with extreme male factor infertility.
- To assess pregnancy and delivery rates following SZI in challenging IVF cases.
Main Methods:
- Performed 213 SZI cycles between September 1988 and September 1992 for patients with extreme male factor.
- Included patients with prior IVF fertilization failure or <50,000 motile sperm post-preparation.
- Reported on 1899 oocytes inseminated via SZI and 138 embryo transfers.
Main Results:
- Achieved 20 clinical pregnancies from 138 embryo transfers.
- Reported a 14.5% pregnancy rate per embryo transfer and 9.4% per cycle.
- Observed a 57.3% rate of normal two-pronuclei fertilization and successful deliveries of healthy infants.
Conclusions:
- Sub-zonal insemination (SZI) is an effective technique for overcoming male infertility barriers in IVF.
- SZI provides a viable option for patients with extreme male factor, leading to successful pregnancies and deliveries.