Excess embryos obtained from intracytoplasmic sperm injection cycles may be cultured and observed until day 5 if the couple receiving treatment do not want them to be cryopreserved. In order to investigate the correlation between blastocyst formation in extended culture and pregnancy outcome, 194 patients treated in two separate IVF units were examined retrospectively. The patients were separated into two groups: group 1 with at least one blastocyst formed in culture, and group 2 with no blastocyst formation. The pregnancy rates were 60.0% and 41.7% for groups 1 and 2, respectively. The pregnancy rate in group 1 was statistically significantly higher than in group 2 (P = 0.01). The results suggest that the developmental potential of embryos obtained from a single assisted reproduction treatment cycle may be similar and that blastocyst formation in vitro may help to predict the pregnancy outcome of that cycle.
[Show abstract][Hide abstract] ABSTRACT: In all, 143 human embryos obtained 3 days (day 3) after insemination or intracytoplasmic sperm injection (ICSI) were biopsied and a single nucleated cell removed for identification of aneuploidy by fluorescent in-situ hybridization (FISH) for chromosomes X, Y, 13, 16, 18 and 21. Fifty-one per cent of embryos were aneuploid and significantly more aneuploid embryos blocked in further development to morulae and blastocysts than euploid embryos (59 versus 34%; P < 0.001). Chromosomal analysis of the generated blastocysts revealed 40% were aneuploid (16 of 40 generated blastocysts). Re-examination of cells by FISH for the same chromosome probes of the inner cell mass (ICM) of expanded and hatching blastocysts derived from the aneuploid embryos revealed a high incidence of mosaicism of ICM cell lineages that were usually predictable from observations of day 3 single-cell biopsies. These data would not support the hypothesis of a preferential allocation of euploid cells to the ICM and aneuploid cells to the trophectoderm. A high concordance between day 3 aneuploidy diagnosis and ICM cell lineages was observed with trisomies (97%), and multiple complex chromosome numerical abnormalities (100%). A reduced concordance was observed with monosomies (65%) and haploidy (18%). Concomitantly, the proportion of ICM cell lineages was increased in blastocysts whose chromosomal condition was diagnosed as haploid (21%) or with complex numerical abnormalities (50%).
Human Reproduction 09/2000; 15(8):1781-6. · 4.57 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To determine whether blastocyst transfer is of benefit to patients with multiple IVF failures.
Retrospective cohort study.
The George Washington University Medical Center.
Patients undergoing IVF between October 1, 1997, and November 30, 1998, who had previously undergone three or more unsuccessful IVF cycles. Patients who had at least three embryos at the 8- to 12-cell stage available on day 3 were eligible for the study.
Patients were given the option of day 3 ET (group A) or blastocyst transfer (group B).
Blastocyst-formation rate, clinical pregnancy rate (PR) per transfer, and implantation rate per transfer.
Groups A and B were similar in terms of age, the number of previous failed IVF cycles, fertilization rate, and the number of fertilized oocytes per cycle. The blastocyst-formation rate was 51.0%. Clinical pregnancy and implantation rates per transfer were statistically significantly higher in the blastocyst-transfer group. There were no multiple pregnancies after blastocyst transfer.
Blastocyst transfer increases implantation rates and PRs in patients with multiple failed IVF cycles, without increasing the risk of multiple pregnancy.
Fertility and Sterility 09/1999; 72(2):218-20. DOI:10.1016/S0015-0282(99)00258-7 · 4.59 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.