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Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome

Background: Various factors, including treatment protocols, can influence the outcomes of frozen embryo transfers (FETs). The study objectives were to compare different endometrial preparation protocols of FET cycles and to evaluate the factors, including the endometrial thickness (ET), that affect...

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Autores principales: Eleftheriadou, Aikaterini, Francis, Abraham, Wilcox, Mark, Jayaprakasan, Kanna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8836366/
https://www.ncbi.nlm.nih.gov/pubmed/35160185
http://dx.doi.org/10.3390/jcm11030737
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author Eleftheriadou, Aikaterini
Francis, Abraham
Wilcox, Mark
Jayaprakasan, Kanna
author_facet Eleftheriadou, Aikaterini
Francis, Abraham
Wilcox, Mark
Jayaprakasan, Kanna
author_sort Eleftheriadou, Aikaterini
collection PubMed
description Background: Various factors, including treatment protocols, can influence the outcomes of frozen embryo transfers (FETs). The study objectives were to compare different endometrial preparation protocols of FET cycles and to evaluate the factors, including the endometrial thickness (ET), that affect outcomes. Methods: This observational cohort study involved 5037 women undergoing FETs at eight tertiary clinics in the UK between January 2016 and March 2019. The endometrial preparation protocols used were natural cycle (NC-FETs), artificial hormone support cycle with oestradiol valerate but without pituitary downregulation (AC-FETs) and artificial hormone support cycle with agonist downregulation (ACDR-FETs). Results: The mean (±SD) ages across NC-FET, AC-FET and ACDR-FET groups were 36.5 (±4.2), 35.9 (±5.0) and 36.4(±4.9) years, respectively. LBRs were comparable (40.7%, 175/430; 36.8%, 986/2658; and 36.7%, 716/1949, respectively) across the three groups. Clinical pregnancy, implantation, multiple pregnancies, miscarriage and ectopic pregnancy rates were also similar. In the regression analysis of variables including age, duration of infertility, number of embryos transferred, protocol type and endometrial thickness, age was the only significant predictor of LBRs, although its predictive ability was poor (AUC: 0.55). With the overall LBR of the study population being 37.1%, the post-test probability of a live birth at an ET of <5 mm was 0%, and at 5–5.9, 6–6.9, 7–7.9 and 8–8.9 mm, the probabilities were 16.7%, 33.8%, 36.7% and 37.7%, respectively. The LBR remained above 35% up to the 14–14.9 mm range and then declined gradually to 23% for the 17–25 mm range. Conclusions: The FET outcomes were similar for the three protocols used for endometrial preparation. The protocol type and endometrial thickness were not predictive of FET outcomes; age was the only predictive variable, despite its low predictive ability.
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spelling pubmed-88363662022-02-12 Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome Eleftheriadou, Aikaterini Francis, Abraham Wilcox, Mark Jayaprakasan, Kanna J Clin Med Article Background: Various factors, including treatment protocols, can influence the outcomes of frozen embryo transfers (FETs). The study objectives were to compare different endometrial preparation protocols of FET cycles and to evaluate the factors, including the endometrial thickness (ET), that affect outcomes. Methods: This observational cohort study involved 5037 women undergoing FETs at eight tertiary clinics in the UK between January 2016 and March 2019. The endometrial preparation protocols used were natural cycle (NC-FETs), artificial hormone support cycle with oestradiol valerate but without pituitary downregulation (AC-FETs) and artificial hormone support cycle with agonist downregulation (ACDR-FETs). Results: The mean (±SD) ages across NC-FET, AC-FET and ACDR-FET groups were 36.5 (±4.2), 35.9 (±5.0) and 36.4(±4.9) years, respectively. LBRs were comparable (40.7%, 175/430; 36.8%, 986/2658; and 36.7%, 716/1949, respectively) across the three groups. Clinical pregnancy, implantation, multiple pregnancies, miscarriage and ectopic pregnancy rates were also similar. In the regression analysis of variables including age, duration of infertility, number of embryos transferred, protocol type and endometrial thickness, age was the only significant predictor of LBRs, although its predictive ability was poor (AUC: 0.55). With the overall LBR of the study population being 37.1%, the post-test probability of a live birth at an ET of <5 mm was 0%, and at 5–5.9, 6–6.9, 7–7.9 and 8–8.9 mm, the probabilities were 16.7%, 33.8%, 36.7% and 37.7%, respectively. The LBR remained above 35% up to the 14–14.9 mm range and then declined gradually to 23% for the 17–25 mm range. Conclusions: The FET outcomes were similar for the three protocols used for endometrial preparation. The protocol type and endometrial thickness were not predictive of FET outcomes; age was the only predictive variable, despite its low predictive ability. MDPI 2022-01-29 /pmc/articles/PMC8836366/ /pubmed/35160185 http://dx.doi.org/10.3390/jcm11030737 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Eleftheriadou, Aikaterini
Francis, Abraham
Wilcox, Mark
Jayaprakasan, Kanna
Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title_full Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title_fullStr Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title_full_unstemmed Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title_short Frozen Blastocyst Embryo Transfer: Comparison of Protocols and Factors Influencing Outcome
title_sort frozen blastocyst embryo transfer: comparison of protocols and factors influencing outcome
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8836366/
https://www.ncbi.nlm.nih.gov/pubmed/35160185
http://dx.doi.org/10.3390/jcm11030737
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