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- W2414078766 abstract "In 12 experiments on 9 chronically-cathetized pregnant sheep (116-143 days of gestation), fetal oxygen consumption, umbilical blood flow and blood gas values were measured before, during and after a 30-min period of hypercapnia, induced by having the ewes breathe 5% CO2 and 18% O2 in N2. During the large amplitude breathing stimulated by hypercapnia, O2 consumption increased by 21%, solely via a rise in O2 extraction. During apnoeic periods and low amplitude breathing in the hypercapnia period, oxygen consumption was not different from the control value, but fetal arterial and umbilical venous PO2 was significantly raised, by 3 and 6 mm Hg respectively. These changes were probably due to a Bohr shift in the maternal oxygen dissociation curve. During large amplitude breathing, PO2 fell to control levels, probably due in part to the increase in O2 extraction. It is concluded that vigorous breathing movements in the fetal sheep, such as those stimulated by hypercapnia, result to an increase in fetal O2 demands. Further, the work of such breathing is large, and probably equivalent to that performed in adults during vigorous hyperventilation against an inspiratory resistance." @default.
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- W2414078766 date "1986-12-01" @default.
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- W2414078766 title "Fetal oxygen consumption and PO2 during hypercapnia in pregnant sheep." @default.
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