Journal of International Reproductive Health/Family Planning ›› 2022, Vol. 41 ›› Issue (1): 6-11.doi: 10.12280/gjszjk.20210361

• Original Article • Previous Articles     Next Articles

Predictors Analysis of Obtaining MⅡ Oocytes or Transferable Embryos in Mild Ovarian Stimulation with Clomiphene Citrate

ZHU Yuan, YI Shan-ling, ZHOU Jian-jun()   

  1. Reproductive Medicine Center, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing 210008, China
  • Received:2021-08-10 Published:2022-01-15 Online:2022-02-17
  • Contact: ZHOU Jian-jun E-mail:zhou6jj@hotmail.com

Abstract:

Objective: To study the predictors of obtaining MⅡ oocytes or transferable embryos in the mild ovarian stimulation IVF/ICSI cycles with clomiphene citrate (CC). Methods: Clinical data of 1 029 cycles using CC mild ovarian stimulation protocol with the number of retrieved oocytes≥1 were collected in the Reproductive Medicine Center of Nanjing Drum Tower Hospital Affiliated to Nanjing University Medical School from January 2014 to December 2015. The baseline characteristics, ovarian stimulation parameters and obtaining MⅡ oocytes or transferable embryos, as well as their relations, were analyzed. Results: The dominant follicle size on trigger day (P=0.024), the number of dominant follicles on trigger day (P<0.001), and the average E2 level of dominant follicles on trigger day (P=0.003) were independent predictors of obtaining MⅡ oocytes, while the dominant follicle size on trigger day (P=0.031) and the number of dominant follicles on trigger day (P<0.001) were independent predictors of obtaining transferable embryos. In single dominant follicle cycles, the E2 level on trigger day was an independent predictor of obtaining transferable embryos (P=0.018). ROC curve analysis showed that the optimal cut-off value of E2 level on trigger day for predicting transferable embryos in single dominant follicle cycles was 1 931.25 pmol/L and AUC was 0.605. The sensitivity was 74.4%, and the specificity was 46.3%. The transferable embryo rate was higher in the group of E2 level on trigger day above the optimal threshold (52.08% vs. 30.28%, P<0.001). Conclusions: In the mild ovarian stimulation with CC, the larger the diameter of the dominant follicle size on trigger day, the greater the number of dominant follicles on trigger day and the higher E2 level of dominant follicles on trigger day, the larger the probability of obtaining MⅡ oocytes. The larger the diameter of the largest dominant follicle and the greater the number of dominant follicles on trigger day, the larger the probability of obtaining transferable embryos. In single dominant follicle cycles, the higher E2 level on trigger day, the greater the probability of obtaining a transferable embryo.

Key words: Ovulation induction, Clomiphene, Oocytes, Embryo transfer, Fertilization in vitro, Mild ovarian stimulation