State-dependent expression of pressure diuresis in conscious rats

Janet E. Steele, Lauren G. Koch, Paul H. Brand

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

In 1967, Guyton and Coleman modeled pressure diuresis as the underlying, essential, long-term mechanism that regulates arterial pressure when sodium intake changes. Other mechanisms that influence renal function interact with pressure diuresis to achieve sodium balance and determine the blood pressure. Increases in sodium intake suppress sodium conserving mechanisms and activate natriuretic mechanisms; decreases in sodium intake have the opposite effect. If the Guyton-Coleman model is correct, then pressure diuresis should be more readily detected in animals on a high-salt diet than in animals on a low-salt diet. We measured spontaneous changes in arterial pressure and urine flow in conscious rats fed low-salt (0.4% NaCl) and high-salt (8.0% NaCl) chow. For 10 rats fed a high-salt diet, arterial pressure and urine flow were positively correlated in 19 of 32 (59%) trials. In 10 rats fed a low-salt diet, a positive correlation was observed in 10 of 33 (30%) trials. Chi- square analysis revealed that differences in Na+ content of the diet were significantly associated with the probability of a positive relationship between blood pressure and urine flow. These results support the hypothesis that the expression of pressure diuresis across time is dependent on the state of sodium balance.

Original languageEnglish (US)
Pages (from-to)109-115
Number of pages7
JournalProceedings of the Society for Experimental Biology and Medicine
Volume224
Issue number2
DOIs
StatePublished - Jun 2000

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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