Relationship between the changes of morphology and thickness of endometrium and pregnancy during frozen-thawed embryos transfer cycles

Objective:To explore the relationship between the change of endometrial thickness,pattern transformation and pregnancy outcome on the determination day of transplantation and transplantation day during frozen-thawed embryos transfer cycles,evaluate the morphological change of endometrium under transvaginal ultrasound and explore whether it can be used to predict clinical pregnancy. Methods:482 frozen-thawed embryos transfer cycles in center of reproductive medicine from October to December in 2009 were analyzed retrospectively,the thickness and morphology of endometrium on the determination day of transplantation and transplantation day were recorded and compared besides routine analysis. Results:The transformation rates of endometrium on the determination day of transplantation and transplantation day in artificial cycle group were significantly higher than those in the other groups,the pregnancy rate in fully transformed endometrium group were higher(P0.05);the pregnancy rate in cases with type C endometrium on transplantation day was higher,but there was no significant difference. Conclusion:The clinical pregnancy rate in fully transformed endometrium group is higher than that in inconspicuous transformed endometrium group,which indicates that fully transformed endometrium is helpful to embryo implantation,the endometrial situation on transplantation day is close to the situation of embryo implantation,it is of clinical significance to enhance ultrasonic monitoring on transplantation day.