240 HEMODYNAMIC RESPONSES OF LAMBS AND ADULT SHEEP TO HEMORRHAGE

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Comparison of the Adrenal and Renal Responses to Angiotensin II in Fetal Lambs and Adult Sheep

The adrenal and renal responses to similar increases in plasma angiotensin II (All) were studied in chronically catheterized fetal lambs (112-131 days gestation; term 145 days) and adult nonpregnant sheep. The rate of All infusion was adjusted to compare the effect of similar rises in plasma AH concentration between fetuses and adult ewes. Increases in plasma All were associated with a decrease...

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Comparison of the adrenal and renal responses to angiotensin II fetal lambs and adult sheep.

The adrenal and renal responses to similar increases in plasma angiotensin II (AII) were studied in chronically catheterized fetal lambs (112-131 days gestation: term 145 days) and adult nonpregnant sheep. The rate of AII infusion was adjusted to compare the effect of similar rises in plasma AII concentration between fetuses and adult ewes. Increases in plasma AII were associated with a decreas...

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Hemodynamic responses of the sheep fetus to vasopressin infusion.

The effects of intravenous infusion of vasopressin on the circulation of the fetus were studied in lambs in utero with chronically maintained intravascular catheters. Vasopressin infused in doses of 0.91-2.26 mU/min per kg fetal weight resulted in plasma levels of arginine vasopressin of 6.836.4 /iU/ml; these levels are similar to those achieved during fetal hypoxia. Petal mean arterial blood p...

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Effect of hemorrhage rate on early hemodynamic responses in conscious sheep

Physiological compensatory mechanisms can mask the extent of hemorrhage in conscious mammals, which can be further complicated by individual tolerance and variations in hemorrhage onset and duration. We assessed the effect of hemorrhage rate on tolerance and early physiologic responses to hemorrhage in conscious sheep. Eight Merino ewes (37.4 ± 1.1 kg) were subjected to fast (1.25 mL/kg/min) an...

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Pregnancy alters hemodynamic responses to hemorrhage in conscious rabbits.

Pregnant animals are less able to maintain mean arterial pressure (MAP) during hemorrhage compared with nonpregnant animals, but the hemodynamic basis of this difference is unknown. The hypothesis that pregnancy attenuates responses of cardiac output, as well as total peripheral resistance (TPR) and femoral conductance, to hemorrhage was tested in conscious rabbits in both the pregnant and nonp...

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ژورنال

عنوان ژورنال: Pediatric Research

سال: 1985

ISSN: 0031-3998,1530-0447

DOI: 10.1203/00006450-198504000-00270