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Total body potassium falls with age

B Rajagopalan, G W Thomas, L J Beilin

    Clinical Science (London, England : 1979)
    |December 1, 1980
    PubMed
    Summary
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    Mild hypertension patients showed similar plasma volume and urine sodium to controls. Total body potassium correlated with renin activity, but this link weakened with age in both groups.

    Area of Science:

    • Cardiovascular Physiology
    • Renal Physiology
    • Hypertension Research

    Background:

    • Understanding the relationship between body fluid composition and blood pressure regulation is crucial in hypertension.
    • Previous studies suggest potential links between electrolytes, hormones, and hypertension, but age-related factors require further investigation.

    Purpose of the Study:

    • To investigate the association between plasma volume, electrolytes, and renin-angiotensin-aldosterone system activity in patients with mild hypertension compared to normotensive controls.
    • To explore the influence of age on these physiological parameters and their interrelationships.

    Main Methods:

    • Cross-sectional study comparing 89 untreated patients with mild hypertension and 89 matched controls.
    • Measurements included plasma volume, 24-hour urine sodium excretion, and total body potassium.

    Related Experiment Videos

  • Renin activity was assessed, and statistical analyses, including partial correlation, were used to evaluate relationships, accounting for age.

    • Main Results:

    • No significant differences were observed in plasma volume, 24-hour urine sodium, or total body potassium between hypertensive patients and controls.
    • A positive correlation was found between total body potassium and renin activity in both groups.
    • Both renin activity and total body potassium demonstrated a significant decline with increasing age in both hypertensive and control subjects.
    • Partial correlation analysis revealed that the relationship between renin activity and total body potassium was not independent of age.

    Conclusions:

    • In mild, untreated hypertension, basic volume and electrolyte status are comparable to normotensive individuals.
    • While total body potassium and renin activity are linked, this association is significantly confounded by the aging process.
    • Age is a critical factor that modifies the interplay between renin activity and potassium balance, irrespective of hypertension status.