Hyperkalemia — Emergent Treatment Protocol
A potassium of 6.8 mEq/L with peaked T waves means the heart could stop in minutes. The treatment sequence you choose — and the order you choose it in — determines whether it does.
Core Concept
Emergent hyperkalemia management follows three priorities in a specific order: stabilize the heart, shift potassium intracellularly, then remove potassium from the body. First, IV calcium gluconate (or calcium chloride via central line) is given to stabilize the cardiac membrane — it does NOT lower potassium but buys time by raising the threshold for cardiac depolarization. Effect is immediate (1-3 minutes) and lasts 30-60 minutes. Second, potassium is shifted into cells using regular insulin (typically 10 units IV) co-administered with dextrose (D50) to prevent hypoglycemia, and/or nebulized albuterol. Insulin-dextrose onset is 15-30 minutes, lasting 2-6 hours. Sodium bicarbonate may be used if acidosis is present since correcting pH drives potassium intracellularly. Third, potassium is eliminated via sodium polystyrene sulfonate (Kayexalate) orally or rectally, loop diuretics if renal function allows, or emergent hemodialysis for refractory cases. Nursing priorities include continuous cardiac monitoring, checking blood glucose every 1-2 hours after insulin administration, and monitoring for rebound hyperkalemia as shifting agents wear off.
Watch Out For
Calcium gluconate protects the heart but does NOT lower potassium — students frequently select it as a potassium-lowering intervention. Insulin shifts potassium into cells (temporary fix) while Kayexalate removes it from the body (actual elimination) — these are different mechanisms with different timelines. Regular insulin is used, never rapid-acting analogs like lispro, for this IV protocol.
Clinical Pearl
Think C-S-E: Cardiac stabilization first (calcium), Shift second (insulin + glucose), Eliminate last (Kayexalate, dialysis). Calcium buys time, insulin buys hours, elimination solves the problem.
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