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J Physiol Vol 331 pp 443-450
Copyright © 1982 by The Physiological Society
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Renal excretion of sodium after bilateral renal sympathectomy in the anaesthetized and conscious rat.

P Bencsáth, M I Fekete, B Kanyicska, G Szénási and L Takács

1. The effect of bilateral renal denervation on sodium excretion was studied in conscious rats on normal, low and high sodium diet, and in rats recovering from anaesthesia, as well as in anaesthetized rats fed a normal sodium diet. 2. Sodium excretion of bilaterally denervated conscious rats on normal sodium intake and during either 2 weeks of sodium depletion or 6 days of sodium loading was not different from that of controls, despite changes in sodium supply of more than two orders of magnitude. Cortical noradrenaline concentration of control kidneys was 138 +/- 12 ng/g, but was only 7 +/- 3 ng/g (P less than 0 . 001) 6 weeks after denervation. 3. In rats recovering from anaesthesia urine flow, sodium excretion and glomerular filtration rate (G.F.R.) were not affected by denervation. 4. In anaesthetized non-diuretic rats on normal sodium diet chronic bilateral renal denervation increased urine flow and sodium excretion four and five times, respectively, with no changes in G.F.R. 5. Mean arterial blood pressure in bilaterally denervated anaesthetized rats and in those recovering from anaesthesia was decreased by 2 . 7 kPa, P less than 0 . 001 and 1 . 2 kPa, P less than 0 . 05, respectively. 6. The participation of renal nerves in the regulation of sodium excretion in conscious rats seems improbable. The denervation natriuresis in anaesthetized rats can be related to higher pre-denervation renal sympathetic nervous activity due to narcosis and surgical stress.




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Am. J. Physiol. Heart Circ. Physiol.Home page
F. Jacob, P. Ariza, and J. W. Osborn
Renal denervation chronically lowers arterial pressure independent of dietary sodium intake in normal rats
Am J Physiol Heart Circ Physiol, June 1, 2003; 284(6): H2302 - H2310.
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