Word: embryos
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...strong language used by Obama struck some observers as the sort of black-and-white rhetoric he usually avoids - and that his predecessor had embraced. Many Catholics, including New York Times columnist Peter Steinfels, embraced the critique leveled by Slate writer William Saletan (a non-Catholic). "Proponents of embryo research are insisting that because we're in a life-and-death struggle - in this case, a scientific struggle - anyone who impedes that struggle by renouncing effective tools is irrational and irresponsible," wrote Saletan. "The war on disease is like the war on terror. Either you're with science...
...lead author and the chief physician at the University of Oulu Division of Infertility and Reproductive Endocrinology. "Now we have more and more experience, and we are doing more and more frozen cycles," he says. He points out the importance of not only transferring but also preserving each embryo on its own, which makes it possible to use frozen embryos one at a time rather than in bigger batches. "[If you transfer] three embryos in each cycle, you very soon don't have any good-quality embryos left," he says. (See the top 10 medical breakthroughs...
...increasingly concerned about the hazards of multiple births, which not only increase risks to mother and infant during pregnancy and delivery, but also raise the chances of later developmental problems for babies who are often born prematurely. Although other studies have also shown the benefits of using elective single-embryo transfer to reduce multiple births, and the technique has become standard in several European countries, there is elsewhere a persistent belief that fewer embryo transfers will yield fewer pregnancies. The idea that more is better is difficult to shake...
...Indeed, some past studies have shown the benefit of multiple-embryo transfer. "When you're just reporting pregnancy rate per transfer, some studies have shown better results in transferring two versus one," says Dr. Lynn Marie Westphal, a fertility specialist and director of women's health at Stanford University School of Medicine...
...even as doctors increasingly consider elective single-embryo transfer the best practice for many IVF candidates, and as more and more fertility clinics report comparable success rates between single- and multiple-embryo transfers, there is still no rule for all women. Even among the best candidates for IVF, says Westphal, there may be much variation. "People don't realize that there's a range," she says. "One 36-year-old is not the same as another 36-year-old, or someone who has done many, many cycles and has terrible embryo quality is not the same as someone...