HUMAN PREGNANCY FOLLOWING CRYOPRESERVATION, THAWING AND TRANSFER OF AN EIGHT-CELL EMBRYO

摘要: The widespread use of clomiphene citrate and exogenous gonadotrophins for in vitro fertilization (IVF) human frequently results the production multiple embryos. Replacement more than two embryos increases pregnancy rate but may result pregnancies with increased pre- post-natal abnormality. Preservation a limited time allows fewer to be replaced on several different occasions thus problems can minimized, effectiveness single IVF procedure embryo replacement adverse maternal conditions avoided. Preimplantation have been successfully cryopreserved many animal species. sensitivity cooling freezing varies between species stages development. We report here cryopreservation procedures that allow high survival four- eight-cell establishment following storage an 4 months liquid nitrogen. terminated at 24 weeks' gestation due development septic Streptomyces agalactiae chorion amnionitis after premature membrane rupture.