alexa A tilting embryo culture system increases the number of high-grade human blastocysts with high implantation competence.
Reproductive Medicine

Reproductive Medicine

Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

Author(s): Hara T, Matsuura K, Kodama T, Sato K, Kikkawa Y,

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Abstract Human embryos normally experience mechanical stimuli during development in vivo. To apply appropriate stimuli to embryos, this study group developed a tilting embryo culture system (TECS) and investigated whether it could improve the grade of fresh human embryos compared with a control static culture system. A total of 450 retrieved oocytes from 32 IVF or intracytoplasmic sperm injection cycles of 32 women were cultured for 5-6 days. Oocytes were divided randomly into TECS and control groups and then were inseminated in vitro. All embryos were evaluated at days 3 and 5 using standard grading criteria for embryo quality. The rates of fertilization per mature oocyte and high-grade cleavage-stage embryo formation in the TECS group were similar to those in the control group. The rates of blastocyst formation and of blastocysts graded 3BB or higher at day 5 were significantly higher in the TECS group than those in the control group: 45.3\% (67/148) versus 32.1\% (51/159) (P=0.018) and 29.1\% (43/148) versus 17.6\% (28/159) (P=0.018), respectively. The TECS group produced more high-grade blastocysts than the control group. Embryo movement or mechanical stimulation during embryo culture may be beneficial for human embryonic development. Copyright © 2012 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved. This article was published in Reprod Biomed Online and referenced in Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

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