LI Lin, PAN Ping, QIU Qi, YAN Dong, ZHANG qingxue, CHEN Xiaoli
【Abstract】 Objective To compare the pregnancy outcomes of luteal support protocols by methods of endometrium preparation in frozen-thawed embryo transfer cycles. Methods The retrospective study included the frozen-thawed embryo transfer cycles using vaginal micronized progesterone for luteal support in Sun Yat-sen Memorial Hospital of Sun Yat-sen University from January 2017 to December 2017, including 437 patients in the natural cycle group and 416 patients in the hormone replacement cycle group. According to different luteal support programs, they were divided into four groups: ① Group A: Progesterone soft capsule 400 mg/d; ② Group B: Progesterone soft capsule 400 mg/d+dydrogesterone 20 mg/d; ③ Group C: Progesterone soft capsule 600 mg/d; ④ Group D: Progesterone soft capsule 600 mg/ D+dydrogesterone 20 mg/ D. Different endometrial preparation regimens, luteal support dosages and pregnancy outcomes were compared. Results ①There was no significant difference in the clinical pregnancy rate, abortion rate and live birth rate among different luteal support schemes in the natural cycle group (P>0.05).② The clinical pregnancy rate in group C was lower than that in group D (35.50%, 51.30%, P=0.008). ③ In group C of hormone replacement cycle, the miscarriage rate of patients <35 years old was lower than those ≥35 years old (7.14%, 36.80%, P=0.004). In group C, the clinical pregnancy rate of patients <35 years of age in the hormone replacement cycle group was lower than that in the natural cycle group (38.90%, 68.30%, P=0.002). Conclusion Enhancing luteal support in artificial cycles would improve the pregnancy outcomes of frozen-thawed cycles.