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Journal of Assisted Reproduction and Genetics

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01-12-2009 | ASSISTED REPRODUCTION

The number of blastomeres in post-thawing embryos affects the rates of pregnancy and delivery in freeze-embryo-transfer cycles

Authors: ShunJi Zhang, ChangFu Lu, Ge Lin, Fei Gong, GuangXiu Lu

Published in: Journal of Assisted Reproduction and Genetics | Issue 11-12/2009

Abstract

Purpose

To observe the differences in pregnancy rates (PRs), delivery rates, and abortion rates associated with frozen-embryo-transfer (FET)-based use of post-thawing embryos with different numbers of blastomeres.

Methods

959 FET cycles and 361 successful FET cycles performed between January 2007 and December 2007. Compare the PRs and abortion rates in post-thawing embryos with 8 blastomeres (8c), 7c, 6c, 5c, 4c,and 3c.

Results

1. The total PRs of post-thawing 8c, 7c, 6c, 5c, 4c, and 3c embryos were 44.1%, 41.0%, 34.4%, 23.8%, 12.5%, and 0%, respectively (p < 0.05). 2. The abortion rates for the transferred embryos of the 8c, 7c, 6c, 5c, and 4c groups were 17.92%, 19.35%, 27.69%, 24%, 20%, respectively (p < 0.05).

Conclusion

The number of blastomeres in the post-thawing embryos is an important factor influencing the occurrence of pregnancy in FET procedures; however, the criterion that post-thawing embryos with 50% intact blastomeres will lead to pregnancy may not be valid.

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Title: The number of blastomeres in post-thawing embryos affects the rates of pregnancy and delivery in freeze-embryo-transfer cycles
Authors: ShunJi Zhang
ChangFu Lu
Ge Lin
Fei Gong
GuangXiu Lu
Publication date: 01-12-2009
Publisher: Springer US
Published in: Journal of Assisted Reproduction and Genetics / Issue 11-12/2009
Print ISSN: 1058-0468
Electronic ISSN: 1573-7330
DOI: https://doi.org/10.1007/s10815-009-9360-4

Keynote webinar | Spotlight on medication adherence

Springer Medicine

The number of blastomeres in post-thawing embryos affects the rates of pregnancy and delivery in freeze-embryo-transfer cycles

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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