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Effects of angiotensin II on plasma antidiuretic hormone and renal water excretion.

Abstract：

:The effects of intravenous (i.v.) and intracarotid (IC) angiotensin II (AII) infusion on systemic and renal hemodynamics, renal water excretion, and plasma antidiuretic hormone (ADH) levels were examined in six conscious dogs under water loaded and hydropenic conditions. In the first group of seven studies, AII in a mean dose of 12.7 ng/kg/min was administered i.v. to water loaded dogs. The infusion induced a significant increase in mean arterial pressure (MAP, 99 to 118 mm Hg, P less than 0.001), and significant reductions in both glomerular filtration rate (GFR, 67 to 57 ml/min, P less than 0.05) and para-aminohippurate clearance (CPAH, 280 to 212 ml/min, P less than 0.005) occurred. Despite this decrement in renal hemodynamics, urine remained maximally dilute (Uosm, 58 to 61 mOsm/kg H2O, NS). Furthermore, plasma ADH was suppressed maximally after water load and did not increase after i.v. AII infusion. The IC infusion of AII (mean dose 5.8 ng/kg/min) produced similar changes in hemodynamics; plasma ADH remained undetectable. When AII was administered i.v. to hydropenic animals (mean dose 8.3 ng/kg/min), MAP again increased (86 to 111 mm Hg, P less than 0.001) as GFR (81.3 to 68.6 ml/min, NS) and CPAH (291 to 223 ml/min, P less than 0.05) declined modestly. In these animals, Uosm decreased significantly (1429 to 1114 mOsm/kg H2O, P less than 0.005) and plasma ADH did not change significantly (1.66 to 1.88 pg/ml, NS). When IC AII (4 ng/kg/min) was repeated in hydropenic dogs pretreated with indomethacin, neither Usom (1787 to 1664 mOsm/kg H2O, NS) nor plasma ADH were altered.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Kidney Int

journal_title

Kidney international

authors

Henrich WL,Walker BR,Handelman WA,Erickson AL,Arnold PE,Schrier RW

doi

10.1038/ki.1986.214

subject

Has Abstract

pub_date

1986-10-01 00:00:00

pages

503-8

issue

4

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)33797-2

journal_volume

30

pub_type

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