Programming the endometrium for deferred transfer of cryopreserved embryos: hormone replacement versus modified natural cycles

Fertility and Sterility
Eva R GroenewoudNicholas S Macklon

Abstract

Over the last decade the use of frozen-thawed embryo transfer has substantially increased, and currently up to one in two embryos transferred has been cryopreserved. To support implantation, endometrial and embryo maturity are required to be synchronized. This can be achieved in various ways. The most commonly applied endometrial preparation methods are the "natural cycle," in which the sequential estrogen and P necessary for endometrial maturation are derived from the developing follicle, and the "artificial" cycle, in which these are sequentially administered. Review of the published data comparing these approaches does not identify a superior approach in terms of clinical outcomes. However, although the "natural cycle" avoids the need for luteal support, the artificial cycle provides more control over timing of ET, and the "modified" natural cycle, in which ovulation is triggered exogenously, may offer both of these advantages. The optimal monitoring strategy for freeze-thaw cycles remains unclear, because only a few studies have addressed this question. Further studies are also required to determine the ideal dosage, method of administration, and duration of estrogen and P supplementation in artificial cycle frozen embryo t...Continue Reading

Associated Clinical Trials

Citations

Apr 15, 2020·Upsala Journal of Medical Sciences·Paula Celada, Ernesto Bosch
Jul 13, 2020·American Journal of Reproductive Immunology : AJRI·Warren J HuberSurendra Sharma
Mar 11, 2020·Frontiers in Endocrinology·Ernesto BoschPeter Humaidan
Apr 9, 2020·Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology·Zhang ShaodiZhang Cuilian
Jun 18, 2020·Frontiers in Endocrinology·Paolo Emanuele Levi SettiPasquale Patrizio
Feb 10, 2020·Trends in Endocrinology and Metabolism : TEM·Paola ViganòEdgardo Somigliana
May 26, 2021·Reproductive Sciences·Michail KalinderisRoy Homburg
Sep 22, 2021·Revista brasileira de ginecologia e obstetrícia : revista da Federação Brasileira das Sociedades de Ginecologia e Obstetrícia·José MetelloSamuel Santos-Ribeiro

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