The shape of fetal oxyhemoglobin dissociation curve places umbilical vein PaO2 values below 30 mmHg on the steep part of the curve, so small changes in maternal PaO2 may cause significant changes in fetal oxygen content. This topic is undergoing peer review. Most books will be available for public use by May 1. To locate only topics that are complete, please use our eMedicine Search Wizard. Medicine is a constantly changing science and not all therapies are clearly established.
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