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Kattera, Suresh; Shrivastav, Pankaj; Craft, Ian

doi:10.1023/a:1020589829458

Cited by 33 publications

(1 citation statement)

References 23 publications

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“…In practice, only a few studies about the superiority of blastocyst FET have been reported and each of them has presented different results. Some investigators have shown favorable pregnancy outcomes in blastocyst FET compared with other staged embryo FET [ 10 , 13 ]. Another study contradicted the former studies [ 14 ].…”

Section: Discussionmentioning

confidence: 99%

Blastocyst transfer in frozen-thawed cycles

Han

Park

Lee

et al. 2012

Clin Exp Reprod Med

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ObjectiveIt is well known that fresh blastocyst transfer results in better pregnancy outcomes with a smaller number of transferred embryos compared with cleavage stage embryo transfer. However, in terms of frozen-thawed blastocyst transfer, only a few studies are available. We aimed to evaluate clinical outcomes of frozen-thawed embryo transfer (FET) with blastocysts.MethodsRetrospective analysis of FET cycles with blastocysts (B-FET) between Jan 2007 and June 2009 was performed. Age-matched FET cycles with cleavage stage embryos (C-FET) during the same period were collected as controls. A total of 58 B-FET cycles were compared with 172 C-FET cycles and also compared with those of post-thaw extended culture blastocysts from frozen pronuclear stage embryos (22 cycles).ResultsThere was no difference in the patient characteristics of each group. The embryos' survival rates after thawing were comparable (>90%) and there was no difference in the implantation rate or clinical and ongoing pregnancy rate among the three groups.ConclusionIn FET, blastocyst transfers may not present better pregnancy outcomes than cleavage stage embryo transfers. A further large-scale prospective study is needed.

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Section: Discussionmentioning

confidence: 99%