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Related Experiment Videos

Genetically determined chloride-sensitive hypertension and stroke

M Tanaka1, O Schmidlin, S L Yi

  • 1Department of Medicine, General Clinical Research Center, University of California, 1202 Moffitt Hospital, San Francisco, CA 94143-0126, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 7, 1998
PubMed
Summary

Dietary chloride, not potassium, determines stroke and hypertension severity in stroke-prone spontaneously hypertensive rats (SHRSP). Chloride supplementation exacerbates conditions, while other potassium salts mitigate them, highlighting chloride

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Area of Science:

  • Nephrology
  • Cardiovascular Science
  • Hypertension Research

Background:

  • Stroke-prone spontaneously hypertensive rats (SHRSP) are a key model for studying salt-sensitive hypertension and stroke.
  • The full expression of SHRSP phenotype is traditionally linked to high sodium (Na+) and low potassium (K+) diets.

Purpose of the Study:

  • To investigate the role of dietary chloride (Cl-) in determining the phenotypic expression of hypertension and stroke in SHRSP.
  • To test the hypothesis that dietary Cl- is a critical factor in SHRSP's stroke and hypertension development.

Main Methods:

  • Radiotelemetric monitoring of blood pressure (BP) in SHRSP under varying dietary potassium (K+) salt supplements (KCl, KHCO3, potassium citrate).
  • Analysis of plasma renin activity (PRA) and stroke incidence in relation to dietary interventions.

Related Experiment Videos

  • Comparison of BP and PRA responses to KCl versus other potassium salts (KB/C).

    • Main Results:

    • Supplementation with potassium chloride (KCl) exacerbated hypertension and induced strokes in SHRSP, unlike potassium bicarbonate or citrate (KB/C).
    • Stroke incidence correlated with high BP and high plasma renin activity (PRA) specifically in the KCl-supplemented group.
    • KCl supplementation led to higher PRA compared to KB/C supplementation.

    Conclusions:

    • The phenotypic expression of hypertension and stroke in SHRSP is selectively sensitive and determined by dietary chloride.
    • Chloride supplementation, even without added sodium, significantly increases hypertension and stroke risk in SHRSP.
    • The likelihood of stroke in chloride-supplemented SHRSP is dependent on the combined increase in blood pressure and plasma renin activity.