Document Detail

Comparison of clinical outcomes between single and double vitrified-warmed blastocyst embryo transfer according to the day of vitrification.
MedLine Citation:
PMID:  23715875     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To compare the efficacy of single vitrified-warmed blastocyst embryo transfer (SVBT) versus double vitrified-warmed blastocyst embryo transfer (DVBT) according to the day of vitrification.
METHODS: This retrospective study included a total of 1,051 cycles in women less than 37 years of age with their autologous SVBT cryopreserved on day 5 (5d-SVBT, n = 737) or day 6 (6d-SVBT, n = 154) and DVBT on day 5 (5d-DVBT, n = 129) or day 6 (6d-DVBT, n = 31) from January 2009 to December 2011.
RESULTS: The clinical pregnancy rate (41.8 % vs. 48.1 %, p = 0.184) and ongoing pregnancy rate (36.6 % vs. 45.0 %, p = 0.072) were not significantly different between the 5d-SVBT group and the 5d-DVBT group. However, the clinical pregnancy (29.9 % vs. 58.1 %, p = 0.003) and ongoing pregnancy rates (23.4 % vs. 51.6 %, p = 0.001) were significantly lower in the 6d-SVBT group compared with those in the 6d-DVBT group. The implantation rate (42.2 % vs. 34.5 %, p = 0.03) of the 5d-SVBT group was significantly higher than that of the 5d-DVBT group, while the implantation rate (29.9 % vs. 37.1 %, p = 0.303) of the 6d-SVBT group was not statistically different compared with that in the 6d-DVBT group. The multiple pregnancy rates (1.0 % in the 5d-SVBT group vs. 38.7 % in the 5d-DVBT group, p < 0.001 and 0 % in the 6d-SVBT group vs. 22.2 % in the 6d-DVBT group, p = 0.001) were statistically significantly lower in the SVBT group compared with those in the DVBT group regardless of the day of vitrification.
CONCLUSIONS: This study showed that the 5d-SVBT resulted in comparable clinical outcomes compared to the 5d-DVBT while the 6d-SVBT yielded significantly lower clinical outcomes compared to the 6d-DVBT.
Sang Min Kang; Sang Won Lee; San Hyun Yoon; Joo Cheol Kim; Jin Ho Lim; Seong Goo Lee
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Publication Detail:
Type:  Journal Article     Date:  2013-05-30
Journal Detail:
Title:  Journal of assisted reproduction and genetics     Volume:  30     ISSN:  1573-7330     ISO Abbreviation:  J. Assist. Reprod. Genet.     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-07-01     Completed Date:  2014-02-13     Revised Date:  2014-06-03    
Medline Journal Info:
Nlm Unique ID:  9206495     Medline TA:  J Assist Reprod Genet     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  779-85     Citation Subset:  IM    
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MeSH Terms
Blastocyst / cytology*
Embryo Transfer / methods*
Fertilization in Vitro
Pregnancy Rate*
Treatment Outcome

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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