Hyperkalemia is a condition characterized by elevated serum potassium levels above 5 mEq/L, which can cause dangerous cardiac arrhythmias and potentially death. It requires prompt recognition and management to prevent cardiac complications.
Key points for clinical pharmacists:
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Etiology: Common causes include impaired renal excretion (e.g., chronic kidney disease), medications that reduce potassium elimination or shift potassium extracellularly (e.g., ACE inhibitors, potassium-sparing diuretics), cell lysis, and metabolic acidosis.
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Clinical significance: Elevated potassium affects cardiac membrane potentials, increasing the risk of life-threatening arrhythmias. ECG changes such as peaked T waves can indicate severity.
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Acute management:
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Stabilize cardiac membranes: IV calcium gluconate or calcium chloride to reduce arrhythmia risk without lowering potassium levels.
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Shift potassium intracellularly: Use insulin (with glucose to prevent hypoglycemia) or beta-2 adrenergic agonists (e.g., albuterol).
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Remove potassium from the body: Sodium polystyrene sulfonate, newer potassium binders (sodium zirconium cyclosilicate or patiromer), loop diuretics, or dialysis if urgent removal is needed.
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Medication review: Identify and discontinue or adjust contributing drugs.
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Monitoring: Frequent potassium and ECG monitoring until stabilized.
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Pharmacist roles:
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Provide guidance on medication adjustments.
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Assist in selecting appropriate treatment options.
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Educate patients about diet and medication adherence to prevent hyperkalemia.
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Collaborate with healthcare teams to maintain guideline-directed medical therapy safely despite elevated potassium.
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