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대한생식의학회지 제21권 제1호 2010년
전핵 시기 및 2-4 세포 시기에 동결 보존된 배아의 발생률 및 임신률
P.L. 산부인과 체외수정 연구실;P.L. 산부인과 체외수정 연구실;P.L. 산부인과 체외수정 연구실;P.L. 산부인과 체외수정 연구실;P.L. 산부인과 체외수정 연구실;P.L. 산부인과 체외수정 연구실;
양현원;최규완;전한식;차영범;이승재;박종민;,
Pregnancy and Development Rates of Human Embryos Cryopreserved at Pronuclear and 2-4 cell stages
Yang, Hyun-Won;Choi, Kyoo-Wan;Cheon, Han-Sik;Cha, Young-Beom;Lee, Seung-Jae;Park, Jong-Min;
IVF Research Laboratory, Park & Lee Infertility Clinic;IVF Research Laboratory, Park & Lee Infertility Clinic;IVF Research Laboratory, Park & Lee Infertility Clinic;IVF Research Laboratory, Park & Lee Infertility Clinic;IVF Research Laboratory, Park & Lee Infertility Clinic;IVF Research Laboratory, Park & Lee Infertility Clinic;
The survival and pregnancy rates were compared between non-frozen embryos and cryopreserved embryos at either pronucleate or 2-4 cell stages using the freezing and thawing techniques being identical in both groups were compared with fresh embryos. 496 embryos were frozen with 1, 2-propanediol and sucrose and 117 2-4 cell stages embryos had been thawed and 79.6 and 66.0% of them respectively were survival. Clinical pregnancy rate was 19.2% for embryos frozen at the pronucleate stage and 19.0% for embryos frozen at the 2-4 cell stages while the pregnancy rate of non-frozen embryos was 21.3%. There were no significant difference in the survival and pregnancy rates of embryos frozen at pronucleate and 2-4 cell stages. The current cumulative pregnancy rate per retrieval in all cycles with frozen zygotes is 35.4 %, consid~ erably higher than observed in single transfers of embryos without cryopreservation(21.3%); predicted pregnancy rate after transfer of all frozen embryos is 43.3 %. It is concluded that firstly, the survival and pregnancy rate of cryopreserved embryos at pronucleate or 2-4 cell stages are very similar to those from their fresh embryos and non-frozen embryos and secondly, cryopreservation substantially enhances pregnancy attainment from in vitro fertilization.
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