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Minimally Invasive Embryo Transfer and Embryo Vitrification at the Optimal Embryo Stage in Rabbit Model
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Clinical outcomes of vitrified-thawed embryo transfer using a pull and cut straw method
Joon Gyo Lim1, Young Tae Heo, Seung Gi Min
1Department of Animal Sciences, Chungbuk National University, Cheongju, Korea. ; Min Byeong Yeol Obstetrics and Gynecology, Cheongju, Korea.
Obstetrics & Gynecology Science
|December 12, 2013
Summary
The pull and cut straw (PNC) method enhances embryo survival and pregnancy rates after vitrification. Selective assisted hatching improves pregnancy rates for poor-quality embryos, optimizing IVF outcomes.
Area of Science:
- Reproductive Medicine
- Embryology
- In Vitro Fertilization
Background:
- Vitrification is a key technique for preserving embryos in assisted reproductive technology.
- Optimizing embryo cryopreservation and transfer protocols is crucial for improving IVF success rates.
Purpose of the Study:
- To compare the clinical outcomes of embryo transfer using the 0.25 mL straw method versus the pull and cut straw (PNC) method.
- To evaluate the impact of assisted hatching at different embryonic stages (cleaved embryo or blastocyst) on pregnancy rates.
Main Methods:
- Retrospective analysis of women undergoing vitrified-warmed embryo transfer between May 2000 and December 2011.
- Comparison of survival and pregnancy rates between assisted hatching treated and non-treated groups post-warming.
Main Results:
- The PNC vitrification method demonstrated improved survival and pregnancy rates, particularly for partially lysed embryos.
- Assisted hatching did not significantly alter developmental or pregnancy rates in the vitrified-warmed blastocyst group.
- Assisted hatching increased the pregnancy rate for poor-quality vitrified-warmed cleaved embryos.
Conclusions:
- The PNC method shows potential for increasing clinical pregnancies through vitrification of both cleaved embryos and blastocysts.
- Targeted assisted hatching for embryos with a poor prognosis post-warming may enhance clinical pregnancy rates.
