Objective:To determine the clinical outcomes of transfer of day 3,8-cell embryos into endometrium prepared for day 3 embryos.Methods:This study performed a retrospective analysis of 1,190 retarded embryos.These embryo...Objective:To determine the clinical outcomes of transfer of day 3,8-cell embryos into endometrium prepared for day 3 embryos.Methods:This study performed a retrospective analysis of 1,190 retarded embryos.These embryos underwent extended culture in vitro to select and vitrify day 4,8-cell embryos,followed by 176 frozen embryo transfer cycles(study group),matching 660 transfer cycles with single frozen day 3,8-cell embryos as the control(control group).Results:The study group achieved successful implantation rates,clinical pregnancy rate,and live-birth rates(20.45%,15.91%,14.20%,respectively),although these were lower than that in the control group(30.45%,27.42%,and 20.91%;P=0.009,0.002,and 0.046,respectively).The miscarriage rate was similar to that in the control group(4.55%vs.3.33%,P>0.05),and the mean birth weight of the study group was higher than that in the control group(3,556±381 g vs.3,311±570 g,P=0.012).Conclusions:Transfer of frozen day 4,8-cell embryos into endometrial prepared for day 3 embryos can be a new and safe alternative for patients with delayed embryos.展开更多
文摘Objective:To determine the clinical outcomes of transfer of day 3,8-cell embryos into endometrium prepared for day 3 embryos.Methods:This study performed a retrospective analysis of 1,190 retarded embryos.These embryos underwent extended culture in vitro to select and vitrify day 4,8-cell embryos,followed by 176 frozen embryo transfer cycles(study group),matching 660 transfer cycles with single frozen day 3,8-cell embryos as the control(control group).Results:The study group achieved successful implantation rates,clinical pregnancy rate,and live-birth rates(20.45%,15.91%,14.20%,respectively),although these were lower than that in the control group(30.45%,27.42%,and 20.91%;P=0.009,0.002,and 0.046,respectively).The miscarriage rate was similar to that in the control group(4.55%vs.3.33%,P>0.05),and the mean birth weight of the study group was higher than that in the control group(3,556±381 g vs.3,311±570 g,P=0.012).Conclusions:Transfer of frozen day 4,8-cell embryos into endometrial prepared for day 3 embryos can be a new and safe alternative for patients with delayed embryos.
