Abstract:

BACKGROUND: Considerable debate exists which factors influence the outcomes of the vitrified frozen-thawed embryo transfer because lack of clinical applications.
OBJECTIVE: To explore the factors influencing the outcomes of the vitrified frozen-thawed embryo transfer in assisted reproductive technology.
METHODS: A retrospective statistical analysis was performed in Reproductive Medicine Center, Renmin Hospital of Wuhan University of 142 patients, 154 thawing cycles. The patients were grouped according to the age of patients, embryonic development, fertilization methods, endometrial preparation programs, the endometrial thickness, the process of transplantation and the survival cell ratio of embryo recovery, the implantation rate and clinical pregnancy rate were compared between various groups.
RESULTS AND CONCLUSION: Among the groups of the different age, fertilization methods, endometrial preparation programs, endometrial thickness and the process of embryo transfer embryo implantation rate and clinical pregnancy rate were no significant difference (P > 0.05); between the two groups of the second day fertilized embryos (D2) and the third day (D3) fertilized embryos, the clinical pregnancy rate was not significant (P > 0.05), but the embryo implantation rate of D3 group was significantly higher than D2 group. The survival cell ratio of embryo recovery has a significant effect on implantation rate and clinical pregnancy rate (P < 0.05). In the frozen-thawed embryo transfer cycles, embryo quality plays a major role in pregnancy rate, and preparation for appropriate endometrial thickness can improve the clinical pregnancy rate.