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• W2106982855 abstract "Glucocorticoid administration to women in premature labor significantly decreases preterm infant morbidity and mortality. Fetal exposure to maternally administered glucocorticoids in late gestation causes fetal hypertension. We determined the effects of a single course (4 injections at 12-hr intervals) of dexamethasone (DM; 2 mg, a weight-adjusted dose equivalent to one-third the dose administered to pregnant women) or saline (S) in sheep at 103-104 days of gestation (dGA; term 149 dGA) on maternal and fetal blood pressure (BP). We also determined the BP and placental perfusion effects of acute maternal hypoxemia. Venous and arterial catheters were placed in 10 ewes and fetuses (DM = 6, S = 4) at 96 +/- 1 dGA. Maternal and fetal placental perfusion was determined with fluorescent microspheres. Dexamethasone increased fetal but not maternal BP; maternal and fetal placental blood flow and vascular resistance (VR) were unchanged. At 105 dGA, hypoxemia was induced for 1 hr by maternal nitrogen gas inhalation to decrease fetal PaO2 by 40%. Hypoxemia increased BP in DM but not S fetuses or mothers in either group. Hypoxemia decreased maternal placental blood flow by 39 +/- 7% and 51 +/- 9% and increased maternal placental VR by 65 +/- 7% and 69 +/- 6% in S and DM mothers, respectively. Hypoxemia did not alter fetal placental blood flow or VR in either treatment group. In summary, at 0.7 gestation, DM induces a hypertensive response to fetal hypoxemia that is characteristic of older fetuses but does not alter hypoxemia-induced reductions in maternal placental blood flow." @default.
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• W2106982855 date "2004-01-01" @default.
• W2106982855 modified "2023-09-27" @default.
• W2106982855 title "Effects of Maternally Administered Dexamethasone and Acute Hypoxemia at 0.7 Gestation on Blood Pressure and Placental Perfusion in Sheep" @default.
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• W2106982855 doi "https://doi.org/10.1081/prg-120028283" @default.
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• W2106982855 hasPublicationYear "2004" @default.
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