August 9th, 2022

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Quantitative Assessment of Endometrial Volume and Uterine Vascularity and Pregnancy Outcome in Frozen-Thawed Embryo Transfer Cycles
Authors:  Jong-Kil Joo, M.D., Ju-Eun Jeong, M.D., Chang-Won Kim, M.D., and Kyu-Sup Lee, M.D.
  OBJECTIVE: To investigate the usefulness of the endometrial volume and vascular indices in the endometrial region as an effective predictor for pregnancy outcome in frozen-thawed embryo transfer (FET).

STUDY DESIGN: We evaluated 131 embryo transfer cycles in 73 infertile women. After controlled ovarian stimulation all embryos were cultured to blastocyst stage, and the blastocysts with good quality were vitrified for elective FET. On the day of FET, endometrial thickness, endometrial volume, pulsatility index (PI), and resistance index of uterine artery and endometrial-subendometrial vessels (ESVs) with zonal discrimination were evaluated by transvaginal ultrasonography in each patient. These variables were compared between pregnant and nonpregnant cycles.

RESULTS: The endometrial volume was significantly higher in the pregnant group (2.320.86, 1.960.62 mL, p=0.007). Also, PI of ESVs was significantly higher in the pregnant cycle (2.581.32 and 2.051.08, p=0.016). The other variables were not different between the 2 groups.

CONCLUSION: This study suggested that endometrial volume and the vascular indices measured in endometrial region are useful predictors of pregnancy outcome.
Keywords:  assisted reproductive techniques, embryo transfer, endometrial volume, endometrium, frozen-thawed embryo transfer, in vitro fertilization, pulsatility index
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