Mr. Fluker et al., A PROSPECTIVE RANDOMIZED COMPARISON OF ZYGOTE INTRAFALLOPIAN TRANSFERAND IN-VITRO FERTILIZATION-EMBRYO TRANSFER FOR NONTUBAL FACTOR INFERTILITY, Fertility and sterility, 60(3), 1993, pp. 515-519
Objective: To evaluate the efficacy of zygote intrafallopian transfer
(ZIFT) versus standard IVF-ET for the treatment of nontubal factor inf
ertility. Design: A prospective randomized trial. Participants: Fifty-
nine couples undergoing oocyte retrieval for nontubal infertility in a
university hospital-based IVF-ET program. Interventions: A maximum of
four cleaving embryos were transferred into the fallopian tube or ute
rine cavity 48 or 55 hours after oocyte retrieval, respectively. Main
Outcome Measures: Rates of implantation, pregnancy, and spontaneous ab
ortion (SAB) were compared. Results: Clinical pregnancies occurred aft
er 26.5% versus 12% of retrievals and 29% versus 14.3% of transfers in
IVF-ET versus ZIFT cycles, respectively. Pregnancy, implantation, and
SAB rates did not differ between the groups. Conclusions: This prospe
ctive randomized trial failed to demonstrate any therapeutic improveme
nt associated with the increased complexity of ZIFT as compared with s
tandard IVF ET.