Association between clinical and IVF laboratory parameters and miscarriage after single euploid embryo transfers

María Del Carmen Nogales, María Cruz, Silvia de Frutos, Eva María Martínez, María Gaytán, Marta Ariza, Fernando Bronet, Juan A Garcia-Velasco, María Del Carmen Nogales, María Cruz, Silvia de Frutos, Eva María Martínez, María Gaytán, Marta Ariza, Fernando Bronet, Juan A Garcia-Velasco

Abstract

Background: The goal of this study was to investigate which factors, excluding embryo aneuploidies, are associated with miscarriage in patients who have undergone a single euploid blastocyst transfer.

Methods: Retrospective, observational and multicenter study with 2832 patients undergoing preimplantational genetic testing for aneuploidies (PGT-A) due to repeated implantation failure, recurrent pregnancy loss, advanced maternal age or severe male factor were transferred one single euploid embryo.

Results: One of the main findings was a significant relationship between body mass index (BMI) and miscarriage rates (13.4% in underweight women, 12.1% in normal weight, 14.5% in overweight, and 19.2% in obese women, odds ratio [OD] 1.04; 95% confidence interval [CI], 1.01-1.07 p = 0.006). Endometrial thickness (OD 0.65; 95%, 0.52-0.77 p = 0.04) and type of endometrial preparation (natural cycle or hormone replacement cycle) (OD 0.77; 95%, 0.52-0.77, p = 0.04) were also associated with miscarriage rates.

Conclusions: BMI was strongly associated to miscarriage rates. We also observed a weaker association with endometrial thickness and with the type of endometrial preparation (natural cycle or hormone replacement cycle). None of the other studied variables (biopsy day, maternal and male age, duration of infertility, cycle length, previous miscarriages, previous live births, previous In Vitro Fertilization (IVF) cycles, endometrial pattern and/or diagnosis) were associated with miscarriage rates.

Keywords: Body mass index; Endometrial thickness; Endometrium; Miscarriage; Preimplantation genetic testing.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2021. The Author(s).

Figures

Fig. 1
Fig. 1
Clinical outcome in the different BMI groups. Pregnancy rate and live birth rate were significantly higher with lower BMI (p < 0.05) when compared to the other three groups (*). Conversely, miscarriage rate was significantly higher in the highest BMI group when compared with the other three groups (**)

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