Clinical and Experimental Reproductive Medicine
- Volume 28 Issue 4
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- Pages.287-293
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- 2001
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- 2233-8233(pISSN)
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- 2233-8241(eISSN)
Effects of Different Infusion Frequency of Liquid Nitrogen on Human Embryo Development and Pregnancy Rates after Freezing and Thawing
인간 배아 동결 해빙시 액체질소의 분사속도가 배아 발달 및 임신에 미치는 영향
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Kim, Young-Ah
(Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University) ;
- Seo, Seong-Seog (Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University) ;
- Kim, Mi-Ran (Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University) ;
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Hwang, Kyung-Joo
(Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University) ;
- Park, Dong-Wook (Department of Molecular Science and Technology, Graduate School of Medicine, Ajou University) ;
- Jo, Mi-Yeong (Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University) ;
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Ryu, Hee-Suk
(Department of Obstetrics and Gynecology, Ajou University School of Medicine, Ajou University)
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김영아
(아주대학교 의과대학 산부인과학교실) ;
- 서성석 (아주대학교 의과대학 산부인과학교실) ;
- 김미란 (아주대학교 의과대학 산부인과학교실) ;
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황경주
(아주대학교 의과대학 산부인과학교실) ;
- 박동욱 (아주대학교 대학원 분자과학기술과) ;
- 조미영 (아주대학교 의과대학 산부인과학교실) ;
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유희석
(아주대학교 의과대학 산부인과학교실)
- Published : 2001.12.30
Abstract
Objective : To investigate the efficacy of high infusion frequency of liquid nitrogen on pregnancy in human embryo after freezing and thawing. Materials and Methods: 150 infertile patients underwent 162 consecutive thawing-ET cycles. In the high infusion frequency group (Group A), 47 patients (50 cycles) underwent cryopreservation with high infusion frequency of liquid nitrogen. In the low infusion frequency group (Group B), 103 patients (112 cycles) underwent cryopreservation with low infusion frequency of liquid nitrogen. We analyzed the clinical characteristics, fertilization rates, development of embryo, good quality embryo ratio, implantation rates, and pregnancy rates between these two groups. Results: There was no difference between the groups with regard to clinical characteristics (mean age, infertility duration, infertility factors, hormone profile), mean number of oocyte retrieval, fertilization rates, and mean embryo number of transfers. The survival rates in group A was 64.9% (228 of 350 embryos), and among the 228 embryos 190 embryos (83.3%) which progressed to the two- to eight-cell stage. After thawing, the embryo numbers were 65 (34.2%), 29 (15.3%), 35 (18.4%), and 37 (19.5%) of grades 1, 2, 3, and above 4, respectively. The survival rates in group B was 63.8% (482 of 755 embryos), and among the 482 embryos 465 embryos (96.5%) which progressed to the two- to eight-cell stage. After thawing, the embryo numbers were 106 (22.8%), 94 (20.2%), 89 (19.1%), and 112 (24.1%) of grades 1, 2, 3, and above 4, respectively. There was no difference in embryo quality change after the freezing-thawing procedure between the groups. Implantation rates (31.1% vs. 34.3%) were not significant. However hCG positive rates in group A (40%) were higher than group B, but not statistically significant. Clinical pregnancy rate (26% vs. 25.9%), on going pregnancy rates (>20 weeks) were not significant (26% vs. 25%). Conclusion: We compared embryo quality change, survival rates, and pregnancy rates between high infusion frequency group and low infusion frequency group and the results were similar between the two groups. Therefore, high infusion frequency of liquid nitrogen for cryopreservation is a worthy method to preserve in human embryos.