Πέμπτη, 1 Μαΐου 2008

the more eggs the better???





A milder form of fertility treatment that is safer for women also results in higher quality embryos that are more likely to develop successfully inside the mother, according to researchers


A milder form of fertility treatment that is safer for women also results in higherquality embryos that are more likely to develop successfully inside the mother, accordingto researchers who compared the method with conventional methods.
They say the technique,which is cheaper because it uses lower doses of hormone-mimicking drugs, should be used more widely by fertility clinics.In conventional IVF doctors begin by massively stimulating the woman's ovaries to produce 10 or more eggs. When these are mixed with sperm this gives the doctors plenty of choice about which embryos to implant back into the womb.
But the new study suggests that many of these embryos will be genetically defective and so will not develop. Even under natural conditions around 30% of early embryos do not progress to the foetus stage because of genetic abnormalities."It has always been thought that the more eggs the better. We like to have a nice assortment of embryos to choose from," said Dr Esther Baart, an embryologist at the University MedicalCentre in Utrecht who carried out the study. But her research suggests that the number of normal eggs is about the same as those delivered by the gentle technique.

source: The Guardian (link below)

1 σχόλιο:

kosmogonia είπε...

It always been difficult to form a strategy when many eggs are collected.
Despite the risk of hyper-stimulation, a unpleasant and sometimes dangerous side effect of stimulated the ovaries, the ivf team must decide when to freeze the many embryos that are produced: Whether it is beneficial to wait until the day of embryo-transfer, select the best embryos and to freeze the surplus embryos… or to freeze some of the embryos on the first day (when the success rate for freeze-thaw survival is higher) and culture blindly the remaining embryo for selection for embryo-transfer ....but being uncertain of their development potential.