Heritability of salt sensitivity in black Americans.


Journal Article

Salt sensitivity is defined as a change in blood pressure in response to changes in salt and water homeostasis. Found in 73% of hypertensive and 36% of normotensive blacks, it is generally considered a hallmark of hypertension in blacks. The higher prevalence of salt sensitivity in blacks compared with whites suggests a genetic influence on this trait, but there is little direct evidence of heritability. We determined the extent to which salt sensitivity is correlated in black families and estimated the heritability of this phenotype. Black families were recruited through a hypertensive proband. Both hypertensive and normotensive adults were phenotyped with respect to salt sensitivity with an intravenous sodium-loading, furosemide volume-depletion protocol. Salt sensitivity was defined as the difference between sodium-loaded and volume-depleted blood pressure. We enrolled 20 families, comprising 30 parent-offspring pairs and 115 adult sibling pairs. Age-adjusted familial correlations ranged from .33 to .44, .19 to .37, and .12 to .21 for mean arterial and systolic and diastolic pressure responses to the salt sensitivity maneuver, respectively. Corresponding heritability estimates were 0.26 to 0.84, 0.26 to 0.74, and 0.004 to 0.24, respectively. These data strongly suggest a heritable component of salt sensitivity.

Full Text

Duke Authors

Cited Authors

  • Svetkey, LP; McKeown, SP; Wilson, AF

Published Date

  • November 1996

Published In

Volume / Issue

  • 28 / 5

Start / End Page

  • 854 - 858

PubMed ID

  • 8901834

Pubmed Central ID

  • 8901834

International Standard Serial Number (ISSN)

  • 0194-911X

Digital Object Identifier (DOI)

  • 10.1161/01.hyp.28.5.854


  • eng

Conference Location

  • United States