A new study by the American Heart Association points to a connection between using frozen embryos during IVF and an increased risk of high blood pressure during pregnancy.
journal Hypertension has found fertilization with frozen embryos to be associated with a considerably higher risk of high blood pressure-related pregnancy complications.
The findings come as a shock to many who previously believed frozen and fresh embryo transfers to have equal risks. “Frozen embryo transfers are now increasingly common all over the world, and in the last few years, some doctors have begun skipping fresh embryo transfer to routinely freeze all embryos in their clinical practice, the so-called ‘freeze-all’ approach,” lead study author Sindre H. Petersen, MD, said in a news release.
Not all scientists are convinced that the spike in high blood pressure is due to the frozen embryo itself as much as the process in which it is transferred. The different ways the uterus is prepared for transfer has been pointed to as a possible risk factor, with even the study’s authors agreeing that additional research is needed to investigate what part of the process might be increasing hypertension risk.
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