Document Detail


Redistribution of glomerular filtration and renal plasma flow in CNS-induced natriuresis.
MedLine Citation:
PMID:  3751635     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Infusion of hypertonic sodium chloride solution into the third cerebral ventricle results in a marked increase in renal sodium output, indicating an important regulator of extracellular volume homeostasis. The intrarenal events governing the enhanced excretion have not been thoroughly studied previously. In 12 anaesthetized male rats a stainless steel cannula was introduced stereotaxically into the right lateral cerebral ventricle. Urine volume and excretion rates, Na, K, and osmotically active particles were measured during control infusion of artificial cerebrospinal fluid and during stimulation of central mechanisms with I M NaCl (520 nl min-1). At the end of the stimulation period, regional renal plasma flow (86RbCl) and glomerular filtration rate (51Cr-EDTA) were measured with single injection techniques. A second group of 12 non-stimulated rats served as controls. During ICV stimulation, the urine flow rate increased from 1.8 +/- 0.19 to 6.4 +/- 1.01 microliter min-1 (P less than 0.001). The urinary concentrations of Na and K increased, leading to a rise in the excretion rates of these ions from 0.12 +/- 0.025 to 0.96 +/- 0.352 mumol min-1 (P less than 0.001) and 0.40 +/- 0.083 to 1.70 +/- 0.196 (P less than 0.001), respectively. The osmolar excretion rate was 2.9 +/- 0.35 mu Osm min-1 before stimulation and 9.6 +/- 1.09 higher (P less than 0.001) during stimulation. Simultaneously the inner medullary plasma flow rose two-fold from 0.7 +/- 0.06 to 1.4 +/- 0.12 microliter min-1 tissue (P less than 0.008).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
M Sjöquist; A Göransson; P Hansell; B Isaksson; H R Ulfendahl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  127     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1986 Aug 
Date Detail:
Created Date:  1986-10-15     Completed Date:  1986-10-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  491-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Glomerular Filtration Rate / drug effects*
Injections, Intraventricular
Male
Natriuresis / drug effects*
Nephrons / drug effects
Osmolar Concentration
Potassium / urine
Rats
Rats, Inbred Strains
Renal Circulation / drug effects*
Saline Solution, Hypertonic / administration & dosage*
Sodium / urine
Sodium Chloride / administration & dosage*
Chemical
Reg. No./Substance:
0/Saline Solution, Hypertonic; 7440-09-7/Potassium; 7440-23-5/Sodium; 7647-14-5/Sodium Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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