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Developmentally delayed cleavage-stage embryos maintain comparable implantation rates in frozen embryo transfers.

Abstract：

PURPOSE:In fresh IVF cycles, embryos reaching the eight-cell stage on day 3 of development are thought to have a higher chance of implantation than those reaching this stage on day 4. To determine whether this difference persists after cryopreservation, we compared pregnancy and implantation rates between frozen embryo transfer (FET) cycles using delayed cleavage-stage embryos (cryopreserved day 4) and normal cleavage-stage embryos (cryopreserved day 3). METHODS:Participants underwent FET between 2008 and 2012 using embryos cryopreserved on either day 3 (n = 76) or day 4 (n = 48), depending on the length of time needed to achieve the eight-cell stage. All embryos, regardless of day of cryopreservation, were thawed and transferred on the 4th day of vaginal progesterone following endometrial preparation with oral estradiol. Chi-square and Mann-Whitney U tests were used to compare patient demographics and cycle outcomes. RESULTS:More women in the day 4 group had diminished ovarian reserve (44 vs 16 %, p = 0.003). Pregnancy outcomes in preceding fresh cycles were not different between the two groups. Pregnancy, implantation, and live birth rates following FET did not differ between the day 3 and day 4 groups. CONCLUSIONS:This is the first study to address outcomes using day 3 versus day 4 cryopreserved embryos. Despite a higher prevalence of diminished ovarian reserve (DOR) in the day 4 group, delayed cleavage-stage embryos utilized in FET cycles performed as well as embryos growing at the normal rate, suggesting delayed embryo development does not affect embryo implantation as long as endometrial synchrony is maintained.

journal_name

J Assist Reprod Genet

journal_title

Journal of assisted reproduction and genetics

authors

Burks H,Buckbinder J,Francis-Hernandez M,Chung K,Jabara S,Bendikson K,Paulson R

doi

10.1007/s10815-015-0561-8

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

1477-81

issue

10

eissn

1058-0468

issn

1573-7330

pii

10.1007/s10815-015-0561-8

journal_volume

32

pub_type

杂志文章

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