Document Detail

A randomized controlled study of human Day 3 embryo cryopreservation by slow freezing or vitrification: vitrification is associated with higher survival, metabolism and blastocyst formation.
MedLine Citation:
PMID:  18544577     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The aim of this study was to compare two methods of cryopreservation for the cleavage-stage human embryo: slow freezing and vitrification. METHODS: A total of 466 Day 3 embryos, donated with consent, underwent cryopreservation by either slow freezing in straws or vitrification using the cryoloop. The vitrification procedure did not include dimethyl sulfoxide, but rather employed ethylene glycol and 1,2-propanediol as the cryoprotectants. Survival, embryonic metabolism and subsequent development to the blastocyst were used to determine the efficacy of the two procedures. RESULTS: Significantly, more embryos survived the vitrification procedure (222/234, 94.8%) than slow freezing (206/232, 88.7%; P < 0.05). Consistent with this observation, pyruvate uptake was significantly greater in the vitrification group, reflecting a higher metabolic rate. Development to the blastocyst was also higher following vitrification (134/222, 60.3%) than following freezing (106/206, 49.5%; P < 0.05). In a separate cohort of 73 patients who had their supernumerary embryos cyropreserved with vitrification, the resulting implantation rate and clinical pregnancy rate were 30 and 49%, respectively. CONCLUSIONS: Analysis of metabolism revealed that vitrification had less impact on the metabolic rate of the embryo than freezing, which was reflected in higher survival rate and subsequent development in vitro. Excellent pregnancy outcomes followed the warming and transfer of vitrified cleavage-stage embryos. These data provide further evidence that vitrification imparts less trauma to cells and is, therefore, a more effective means of cryopreserving the human embryo than conventional slow freezing. identifier: NCT00608010.
B Balaban; B Urman; B Ata; A Isiklar; M G Larman; R Hamilton; D K Gardner
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2008-06-10
Journal Detail:
Title:  Human reproduction (Oxford, England)     Volume:  23     ISSN:  1460-2350     ISO Abbreviation:  Hum. Reprod.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-08-19     Completed Date:  2008-11-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8701199     Medline TA:  Hum Reprod     Country:  England    
Other Details:
Languages:  eng     Pagination:  1976-82     Citation Subset:  IM    
Assisted Reproduction Unit, American Hospital of Istanbul, Guzelbahce Sokak 20, Nisantasi, Istanbul 34365, Turkey.
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MeSH Terms
Blastocyst / metabolism,  physiology*
Cohort Studies
Cryopreservation / methods*
Embryo Culture Techniques
Embryo, Mammalian / metabolism,  physiology
Embryonic Development*
Pregnancy Rate
Pyruvic Acid / metabolism
Reg. No./Substance:
127-17-3/Pyruvic Acid

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

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