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AJP - Regulatory, Integrative and Comparative Physiology, Vol 252, Issue 2 314-R319, Copyright © 1987 by American Physiological Society
ARTICLES |
S. M. Block, J. C. Rose, J. M. Ernest, K. Flowe, S. South and C. Zimmerman
To evaluate the role of the alpha 1-adrenergic system in the response to hemorrhage during development, lambs and adult sheep were chronically catheterized and hemorrhaged after pretreatment with prazosin or vehicle. The adults became markedly more hypotensive after alpha 1-blockade and hemorrhage than after vehicle and hemorrhage (26.1 +/- 4 vs. 10.7 +/- 2%, P less than 0.0001), whereas the lambs were no more hypotensive when hemorrhaged after prazosin (21.5 +/- 3.2 vs. 23.1 +/- 4.4%, P greater than 0.05). In the adults and the lambs, hemorrhage produced elevations in plasma renin activity and arginine vasopressin. However, after prazosin, the adults had a far greater increase in arginine vasopressin levels than after vehicle treatment (1,970 +/- 820 vs. 320 +/- 273%).
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F. G. Smith and I. Abu-Amarah Renal denervation alters cardiovascular and endocrine responses to hemorrhage in conscious newborn lambs Am J Physiol Heart Circ Physiol, July 1, 1998; 275(1): H285 - H291. [Abstract] [Full Text] [PDF] |
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