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JOURNAL ARTICLE
REVIEW
New Therapeutic Approaches for the Treatment of Hyperkalemia in Patients Treated with Renin-Angiotensin-Aldosterone System Inhibitors.
Cardiovascular Drugs and Therapy 2018 Februrary
Hyperkalemia (serum potassium > 5.5 mEq/L) is a common clinical problem in patients with chronic kidney disease, hypertension, diabetes, and heart failure. It can result from increased K+ intake, impaired distribution between intracellular and extracellular spaces, and most frequently, decreased renal excretion. Patients at the highest risk of hyperkalemia are treated with renin-angiotensin-aldosterone system inhibitors (RAASIs) as they improve cardiovascular and renal outcomes and are strongly recommended in clinical guidelines. However, RAASIs cause or increase the risk of hyperkalemia, a key limitation to fully titrate RAASIs in patients who are most likely to benefit from treatment. Until recently, drugs for the treatment of hyperkalemia presented limited efficacy and/or safety concerns and there was an unmet need of new drugs to control hyperkalemia while maintaining RAASI therapy. We provide an overview of the mechanisms involved in K+ homeostasis and the epidemiology and management of hyperkalemia as a complication in cardiovascular patients and, finally, analyze the efficacy and safety of two new polymer-based, non-systemic agents, patiromer calcium and sodium zirconium cyclosilicate (ZS-9), designed to increase fecal K+ loss and to normalize elevated serum K+ levels and chronically maintain K+ homeostasis in hyperkalemic patients treated with RAASIs.
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