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Role of blood volume expansion in Dahl rat model of hypertension. Am J Physiol 1990 Feb;258(2 Pt 2):H508-14 PMID: 2309916

Abstract

Continuous measurement and servo control (SC) of total body weight of unrestrained rats were used to investigate the role of volume expansion in the development of hypertension in Dahl salt-resistant (SR) and Dahl salt-sensitive (SS) rats. A change in sodium intake from 1 to 20 meq/day was associated with an increase in total body weight of 7.2% in both SS and SR rats over 96 h. Plasma sodium (pNa) increased from 145.0 to 147.4 meq/l in both SS (n = 10) and SR (n = 10) rats. Only in the SS rats was the volume expansion associated with an increase in arterial pressure of 27 +/- 3 mmHg. Prevention of the volume expansion by SC blocked the rise in arterial pressure in the SS rats (n = 10) but increased pNa from 143.5 to 152.4 meq/l. Hematocrit fell from 36.6 to 27.5% in both non-SC groups but decreased less in SC groups (35.7 to 32.0%). Plasma volume expansion from 17.6 +/- 0.6 to 25.2 +/- 0.8 ml in non-SC rats was greatly blunted by SC. In non-SC rats, SS (n = 10) and SR (n = 9) rats an increase in salt intake was associated with a rise in cardiac output from 413 +/- 6 to 507 +/- 12 ml.min-1.kg-1 in both groups. These results indicate that fluid retention is required to trigger the rise of pressure in Dahl SS rats.

Author List

Greene AS, Yu ZY, Roman RJ, Cowley AW Jr

Author

Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Blood Pressure
Blood Volume
Cardiac Output
Diet
Drug Resistance
Hypertension
Rats
Rats, Inbred Strains
Rats, Mutant Strains
Sodium
Sodium Chloride



View this publication's entry at the Pubmed website PMID: 2309916
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