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Clinical and Experimental Obstetrics & Gynecology  2017, Vol. 44 Issue (4): 577-580    DOI: 10.12891/ceog3496.2017
Original Research Previous articles | Next articles
Preliminary study for pregnancy rate according to developmental stages of vitrified-warmed blastocyst
J.K. Joo1, J.E. Jeong1, J.B. Son1, G.R. Ko2, K.S. Lee1, *()
1 Department of Obstetrics and Gynecology, Medical Research Institute, Pusan National University, School of Medicine, Busan, Korea
2 Infertility clinic, Pusan National University Hospital, Busan, Korea
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Abstract  Purpose: To examine the pregnancy rate according to developmental stages of vitrified-warmed human blastocyst at the time of embryo transfer (ET). Materials and Methods: Retrospectively, the outcomes of total 140 elective frozen thawed blastocyst transfers were analyzed regarding the embryo developmental stage of the thawed blastocysts at the time of transfer. Group 1 included only expanding blastocysts, group 2 included an expanding blastocyst and a hatching blastocyst, and group 3 included only hatching blastocysts. Results: Implantation rate, clinical pregnancy rate, and ongoing pregnancy rate were significantly higher in group 3 than group 1 and 2. Implantation rates were 32.6% (group 1), 56.6% (group 2), and 77.2% (group 3) (p < 0.05). Clinical pregnancy rates were 25.6% (group 1), 45.3% (group 2) and 70.5% (group 3) (p < 0.05). Ongoing pregnancy rates were 20.9% (group 1), 39.6% (group 2), and 47.7% (group 3) (p < 0.05). Conclusions: Pregnancy rate was higher in transfer of hatching blastocysts than in expanding blastocysts.
Key words:  Assisted hatching      Frozen-thawed embryo transfer      Hatching blastocyst      Pregnancy rate     
Published:  10 August 2017     
*Corresponding Author(s):  K.S. LEE     E-mail:  kuslee@pusan.ac.kr

Cite this article: 

J.K. Joo, J.E. Jeong, J.B. Son, G.R. Ko, K.S. Lee. Preliminary study for pregnancy rate according to developmental stages of vitrified-warmed blastocyst. Clinical and Experimental Obstetrics & Gynecology, 2017, 44(4): 577-580.

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https://ceog.imrpress.com/EN/10.12891/ceog3496.2017     OR     https://ceog.imrpress.com/EN/Y2017/V44/I4/577

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