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. 2023 Jan 4:9:1081782.
doi: 10.3389/fmed.2022.1081782. eCollection 2022.

Effect of interval between oocyte retrieval and resuscitation embryo transfer on pregnancy outcomes

Qi Wan  1   2   3 , Ming-Xing Chen  4 , Xuejiao Wang  1 , Li Tan  1 , Hui-Jun Yu  1 , Xing-Yu Lv  1 , Zhao-Hui Zhong  5 , Xiao-Jun Tang  5 , Yu-Bin Ding  4 , Min Xia  6 , Yuan Li  1
Affiliations

Effect of interval between oocyte retrieval and resuscitation embryo transfer on pregnancy outcomes

Qi Wan et al. Front Med (Lausanne). .

Abstract

Objectives: Resuscitation transfer of embryos after elective cryopreservation has been widely applied in in vitro fertilization-embryo transfer (IVF-ET) therapy for human infertility or sterility owing to higher embryo implantation rates. This method separates oocyte retrieval from embryo transfer. The optimal time for frozen embryo transfer (FET) remains unknown. Therefore, this study mainly compares the advantages and disadvantages of delayed FET and immediate FET through retrospective analysis.

Methods: We analyzed real world data of patients who underwent resuscitation transplantation between October 2019 and July 2021 at the Reproductive Center of Chengdu Jinjiang Hospital for Women's and Children's Health. Propensity score matching was applied to control potential confounding factors. A total of 5,549 patients who received at least one FET were analyzed. Patients undergoing transplantation within 60 days of oocyte retrieval were included in the immediate FET group (n = 1,265) and those undergoing transplantation > 60 days after retrieval were included in the delayed FET group (n = 4,284).

Results: Live birth rates between the two groups were comparable (45.25% vs. 45.76%, p = 0.757). Moreover, no difference was observed in the rates of biochemical pregnancy (64.50% vs. 66.80%), clinical pregnancy (55.24% vs. 56.83%), ectopic pregnancy (1.47% vs. 1.39%), early miscarriage (14.41% vs. 16.20%), late miscarriage (2.21% vs. 2.09%), singleton premature delivery (16.67% vs. 18.29%), and neonatal deformity (1.97% vs. 1.80%). After stratifying the patients based on the type of embryo transferred, number of embryos transferred, FET protocol, and good prognosis criteria, live birth rates remained comparable between the two groups (p > 0.05).

Conclusion: Pregnancy outcomes were comparable between the immediate and delayed FET groups.

Keywords: clinical pregnancy; delayed frozen embryo transfer; immediate frozen embryo transfer; live birth rate; pregnancy outcome.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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