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. 2022 Apr 27:13:821753.
doi: 10.3389/fendo.2022.821753. eCollection 2022.

Influence of Maternal Age on the Relationship Between Endometrial Thickness and Ongoing Pregnancy Rates in Frozen-Thawed Embryo Transfer Cycles: A Retrospective Analysis of 2,562 Cycles

Haiqing Tian  1 , Hejiang Zhang  2 , Hong Qiu  3 , Xuejiao Yang  3 , Xiaolin La  3 , Lei Cui  1
Affiliations

Influence of Maternal Age on the Relationship Between Endometrial Thickness and Ongoing Pregnancy Rates in Frozen-Thawed Embryo Transfer Cycles: A Retrospective Analysis of 2,562 Cycles

Haiqing Tian et al. Front Endocrinol (Lausanne). .

Abstract

Background: In frozen-thawed embryo transfer (FET) cycles, endometrial thickness (EMT) has been used routinely as the main clinical monitoring index. However, the current findings are conflicting.

Method: This was a single-center retrospective study of 2,054 couples (2,562 cycles) who underwent FET (including cleavage stage embryos and blastocysts) between January 2017 and August 2020 in the reproductive centers of First Affiliated Hospital of Xinjiang Medical University. The primary outcome measure was the ongoing pregnancy rate (OPR); the secondary outcome was the clinical pregnancy rate.

Results: After stratified analysis and adjusting for confounders such as maternal age, duration of infertility, number of high-quality embryos transferred, endometrial preparation protocol, number of transfer cycles, and stages of embryo transferred, we found a curvilinear relationship between EMT and the OPR in women < 35 years of age. For women with EMT ≤ 8 mm, the OPR increased by 150% for cleavage stage embryo transfer for every 1 mm increase in the EMT; similarly, it increased by 97% for blastocyst stage FET. However, there was a linear relationship between EMT and OPR in women aged ≥ 35 years. When blastocysts were transferred, for every 1 mm increase in the EMT the OPR increased significantly by 12%. But OPR after frozen-thawed cleavage stage embryos transfer did not increase significantly with increased EMT.

Conclusions: Our study showed that the OPR increased significantly with increased EMT between young women aged < 35 years with EMT ≤ 8 mm and older women who underwent transfer of blastocysts.

Keywords: FET; blastocysts; cleavage stage embryos; endometrial thickness; ongoing pregnancy rates.

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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.

Figures

Figure 2
Figure 2
The association between EMT and OPR in two groups of women. A nonlinear relationship for women < 35 years and a linear relationship for women ≥35 years were detected after adjusting for endometrial preparation protocol, duration of infertility, maternal height, number of good-quality embryos transferred, number of transferred cycles, and stage of embryo transferred.
Figure 1
Figure 1
Flow chart of the patients enrolled and the study outline.
See this image and copyright information in PMC

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