Journal of International Reproductive Health/Family Planning ›› 2022, Vol. 41 ›› Issue (5): 370-374.doi: 10.12280/gjszjk.20220059

• Original Article • Previous Articles     Next Articles

Effect of Cryopreservation Time on the Outcome of Frozen-Thawed Embryos Transplant

LIANG Hui-zhi, WANG Zhi-hong(), YANG Pan   

  1. The First Clinical Medical College of Shanxi Medical University, Taiyuan 030001, China
  • Received:2022-02-05 Published:2022-09-15 Online:2022-10-12
  • Contact: WANG Zhi-hong E-mail:Wzh888vv@163.com

Abstract:

Objective: To explore the effect of vitrification cryopreservation time on the outcome of cleavage embryo transfer. Methods: From January 2017 to December 2020, 3 847 cases of vitrification cryo-resuscitation transfer of cleavage embryos, including 8 767 freeze-thaw embryos, were performed in Reproductive Medicine Center, The First Hospital of Shanxi Medical University. According to the cryopreservation time of embryos, the embryos were divided into 5 groups: group 1 was ≤1 year, group 2 1-2 years, group 3 2-3 years, group 4 3-4 years and group 5 >4 years. The general situation of patients, embryo thawing and recovery and clinical outcomes were compared among the groups. Logistic regression analysis was used to analyze the effect of maternal age at oocyte retrieval and embryo transfer, embryo cryopreservation time, the number of transferred embryos or high-quality embryos on the pregnancy outcome. Results: There were significant differences in the maternal age at oocyte retrieval and embryo transfer, the number of transferred embryos, pregnancy rate and live birth rate (P<0.05). Logistic regression analysis showed that maternal age at oocyte retrieval or embryo transfer, and embryo cryopreservation time had no significant effect on the pregnancy rate and live birth rate (P>0.05), while there were significant differences in the number of transferred embryos and high-quality embryos (P<0.05). Conclusions: The duration of vitrification cryopreservation had no significant effect on the cleavage stage embryo resuscitation and pregnancy outcome.

Key words: Cryopreservation, Freezing, Cleavage stage, ovum, Embryo transfer, Pregnancy outcome, Vitrification freezing