Tension maternal arterial oxygen

Effects of Varying Maternal Arterial Oxygen Tension. Oxygen, air, and various N2-air mixtures were administered randomly to four ewes for 3-10-min intervals (47). The inspired gases achieved maternal arterial 02 tensions ranging from 30-350 mm Hg. During this interval the isolated... 

The fetal and maternal flow rates were set at 40-80 ml/min and 450 ml/min, respectively, and an amniotic fluid pressure of 15 mm Hg was maintained over the placenta throughout the experiment. Oxygen tensions were 60-160 mm Hg in the maternal artery and 14-28 mm Hg in the fetal vein. Glucose was added at the beginning of the perfusion to help maintain placental viability. 

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