Frozen IVF Cycles to Circumvent the Hormonal Storm on Endometrium

Publication date: Available online 5 February 2020Source: Trends in Endocrinology & MetabolismAuthor(s): Paola Viganò, Alessandra Alteri, Andrea Busnelli, Valeria Stella Vanni, Edgardo SomiglianaControlled ovarian hyperstimulation (COH) determines an anticipation of endometrial maturation and a premature occurrence of the implantation window, as shown by histological, histochemical, and molecular studies and indirectly by clinical trials. There is growing agreement that in patients hyper-responding to COH and in those undergoing transfer at the blastocyst stage, deferring the transfer in a subsequent frozen cycle could increase pregnancy outcomes. For blastocysts, implantation after a fresh transfer may be limited as the implantation window is already closed while, in hyper-responders to COH, the anticipation magnitude could be more marked thus hampering implantation also for cleavage-stage embryos. Research should focus in depth on pregnancy outcomes and on the most suitable modality to prepare the endometrium for frozen transfers.
Source: Trends in Endocrinology and Metabolism - Category: Endocrinology Source Type: research