alexa High fertilization and implantation rates after intracytoplasmic sperm injection.
Genetics

Genetics

Journal of Aging Science

Author(s): Van Steirteghem AC, Nagy Z, Joris H, Liu J, Staessen C, , Van Steirteghem AC, Nagy Z, Joris H, Liu J, Staessen C,

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Abstract Previously reported better fertilization rate after intracytoplasmic single sperm injection (ICSI) than after subzonal insemination of several spermatozoa was confirmed in a controlled comparison of the two procedures in 11 patients. Intracytoplasmic sperm injection was carried out in 150 consecutive treatment cycles of 150 infertile couples, who had failed to have fertilized oocytes after standard in-vitro fertilization (IVF) procedures or who were not accepted for IVF because not enough motile spermatozoa were present in the ejaculate. A single spermatozoon was injected into the ooplasm of 1409 metaphase II oocytes. Only 117 oocytes (8.3\%) were damaged by the procedure and 830 oocytes (64.2\% of the successfully injected oocytes) had two distinct pronuclei the morning after the injection procedure. The fertilization rate was not influenced by semen characteristics. After 24 h of further in-vitro culture, 71.2\% of these oocytes developed into embryos, which were transferred or cryopreserved. Only 15 patients did not have embryos replaced. Three-quarters of the transfers were triple-embryo transfers. High pregnancy rates were noticed since 67 pregnancies were achieved, of which 53 were clinical, i.e. a total and clinical pregnancy rate of 44.7\% and 35.3\% per started cycle and 49.6\% and 39.2\% per embryo transfer. A total of 237 supernumerary embryos were cryopreserved in 71 treatment cycles.
This article was published in Hum Reprod and referenced in Journal of Aging Science

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