J. Boldt et al., SUCCESS RATES FOLLOWING INTRACYTOPLASMIC SPERM INJECTION ARE IMPROVEDBY USING ZIFT VS IVF FOR EMBRYO-TRANSFER, Journal of assisted reproduction and genetics, 13(10), 1996, pp. 782-785
Purpose: The purpose of this study was to analyze whether the mode of
embryo transfer (ZIFT vs IVF) affected the outcome in intracytoplasmic
sperm injection (ICSI) cycles. Methods and Results: Eighty-two ICSI c
ycles (42 ZIFT and 40 IVF) were analyzed. Several variables, including
patient age and weight numbers of mature eggs collected injected, and
fertilized, fertilization rare, number of fertilized eggs obtained pe
r cycle, numbers of zygotes/embryos transferred clinical pregnancy rar
e, and implantation rate, were compared. Mean patient age and weight w
ere identical. The mean number of mature eggs collected and injected a
nd fertilization rate were significantly higher in the ZIFT group, how
ever the mean numbers of zygotes/embryos transferred were identical. T
he clinical pregnancy and implantation rates in ZIFT cycles (52.3 and
23.2% respectively) were significantly higher than in IVF cycles (17.5
and 9.7%). Conclusions: These data suggest that ZIFT is the more appr
opriate method for transfer of ICSI-derived embryos.