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Potassium supplementation for the management of primary hypertension in adults

H O Dickinson, D J Nicolson, F Campbell

    The Cochrane Database of Systematic Reviews
    |July 21, 2006
    PubMed

    Insights

    Potassium supplementation did not significantly lower blood pressure in individuals with elevated levels. More high-quality, longer-term studies are needed to confirm these findings on blood pressure and health outcomes.

    Area of Science:

    • Cardiovascular Health
    • Nutritional Science
    • Clinical Trials

    Background:

    • Inconsistent epidemiological data exists regarding potassium's effect on blood pressure.
    • Elevated blood pressure (hypertension) is a significant global health concern.

    Purpose of the Study:

    • To assess the impact of potassium supplementation on blood pressure and health outcomes in individuals with elevated blood pressure.
    • To synthesize evidence from randomized controlled trials (RCTs) on potassium's hypertensive effects.

    Main Methods:

    • Systematic literature search across multiple databases (Cochrane Library, MEDLINE, EMBASE, etc.).
    • Inclusion of parallel or crossover RCTs with >=8 weeks follow-up in adults (>=18 years) with elevated SBP (>=140 mmHg) or DBP (>=85 mmHg).
    • Random effects meta-analyses and sensitivity analyses were performed on extracted data.

    Main Results:

    • Six RCTs (n=483) met the criteria; meta-analysis of five trials (n=425) showed non-significant reductions in SBP (MD: -11.2 mmHg) and DBP (MD: -5.0 mmHg).
    • Substantial heterogeneity was observed and not explained by dose, quality, or baseline blood pressure.
    • Sensitivity analyses, including exclusion of a high-baseline BP trial and focus on high-quality trials, also yielded non-significant blood pressure reductions.

    Conclusions:

    • This review found no statistically significant effect of potassium supplementation on blood pressure.
    • The evidence remains inconclusive due to small sample sizes, short follow-up, and unexplained heterogeneity.
    • Further high-quality, longer-duration RCTs are necessary to definitively determine potassium's role in blood pressure management and health outcomes.
    Abstract

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