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Ongoing pregnancy rates from vitrified eggs as good as those from fresh
Date:6/30/2010

nts who would be at risk of ovarian hyperstimulation, and those where a semen sample is not immediately available."

Once an egg donor is recruited and screened she undergoes ovarian stimulation to produce a number of oocytes, which are then retrieved. The oocytes then need to be fertilised by the sperm of the male partner of the recipient and the best embryos thus produced are placed in the uterus of the recipient, whose uterine lining has been previously prepared to be ready to receive the embryo.

When using fresh oocytes, the need for synchronisation of all these procedures is paramount, but not always possible. Egg banking precludes the need to synchronise these timings, which can also be the cause of long delays.

"As well as being able to shorten or even eliminate the current long waiting lists, egg banking also offers a safer donation process because it allows oocytes to be quarantined while the absence of any contagious disease in the donor is confirmed," said Dr. Cobo. "Until now we have been unable to do this with any certainty."

The scientists now intend to continue their research by following up the progress of babies born after oocyte vitrification. "We need to ascertain that there are no adverse effects on children conceived from cryopreserved oocytes," said Dr. Cobo, "so we will compare obstetric and neonatal data from babies born after oocyte vitrification with those resulting from the replacement of embryos originating from fresh oocytes. Having made sure that the pregnancies are safe, it is important to ensure that pregnancy outcomes are also free from harm."


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Contact: Mary Rice
mary@mrcommunication.org
European Society of Human Reproduction and Embryology
Source:Eurekalert

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