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Resistant hypertension and the neglected antihypertensive: sodium restriction

Rajiv Agarwal

    Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
    |August 18, 2012
    PubMed

    Insights

    Resistant hypertension, affecting 15% of treated patients, requires careful diagnosis. Sodium restriction is a key, yet often overlooked, strategy to manage high blood pressure (BP) and enhance antihypertensive medication effectiveness.

    Area of Science:

    • Cardiology
    • Nephrology
    • Pharmacology

    Background:

    • Resistant hypertension (RH) is defined as blood pressure (BP) remaining above goal despite optimal doses of three antihypertensive agents, including a diuretic.
    • It affects approximately 15% of treated hypertensive patients and is linked to risk factors like older age, chronic kidney disease (CKD), obesity, and diabetes mellitus.

    Discussion:

    • Causes of RH include poor adherence, biological-behavioral factors, CKD, secondary causes, and exogenous substances.
    • Pseudo-resistant hypertension must be excluded via home BP monitoring and ambulatory BP monitoring before diagnosing RH.
    • Dietary sodium restriction is a crucial, yet neglected, antihypertensive strategy.

    Key Insights:

    • Sodium restriction can lower BP and potentiate the anti-proteinuric effects of renin-angiotensin system inhibitors in patients with proteinuria.
    • Patient education on food labels and feedback via 24-hour urine sodium assessment are effective sodium restriction methods.
    • Implementing sodium restriction can improve BP control and medication efficacy in resistant hypertension.

    Outlook:

    • Further research into optimizing sodium restriction protocols for resistant hypertension is warranted.
    • Integrating comprehensive patient education on sodium intake into routine care could improve outcomes.
    • Exploring the synergistic effects of sodium restriction with novel antihypertensive therapies may offer new management avenues.

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