Time-critical hyperkalemia protocol (K+ > 6.5 mEq/L or ECG changes): immediate membrane stabilization with IV Calcium, intracellular shifting with Insulin/Dextrose and beta-agonists, and definitive potassium elimination.
Severe hyperkalemia (serum potassium [K+] > 6.5 mEq/L, or any potassium elevation accompanied by ECG changes or muscle weakness) is a time-critical cardiovascular emergency. Elevated extracellular potassium partially depolarizes the resting membrane potential of cardiomyocytes, inactivating voltage-gated sodium channels and slowing cardiac conduction velocity, leading swiftly to ventricular fibrillation, high-grade AV block, sine wave rhythm, and asystolic cardiac arrest.
Caution
Dangerous Diagnosis Not to Miss: Imminent Hyperkalemic Cardiac Arrest (sine wave ECG progressing to VF/asystole), Severe Acute Rhabdomyolysis (massive muscle breakdown releasing intracellular potassium and myoglobin), Tumor Lysis Syndrome, and Anuric Acute Renal Failure.
Severe hyperkalemia: stabilize, shift, remove
Calcium protects the myocardium but does not lower serum potassium; every severe case still needs potassium shifting, removal and repeat measurement.
Progression of electrophysiologic signs (can occur unpredictably or rapidly):
K+ 5.5–6.5 mEq/L: Tall, peaked, symmetrical T-waves with a narrow base (best seen in precordial leads V2–V4).
K+ 6.5–7.5 mEq/L: PR interval prolongation, loss/flattening of P-waves, ST-segment depression.
K+ 7.5–8.5 mEq/L: QRS complex widening, bundle branch blocks, fascicular blocks, high-grade AV block, junctional or ventricular bradycardia.
K+ > 8.5 mEq/L: Merging of wide QRS with T-wave forming the ominous 'Sine Wave' pattern -> immediate Ventricular Fibrillation or Asystole.
Indication: Any ECG changes (peaked T-waves, wide QRS, loss of P) OR serum K+ > 6.5–7.0 mEq/L.
Mechanism: Calcium restores resting membrane threshold potential, counteracting potassium depolarization without lowering serum potassium.
Dosing & Administration:
Drives extracellular potassium into cells temporarily (buys 2–4 hours for elimination):
IV Regular Insulin + Dextrose (Gold Standard):
Inhaled Beta-2 Agonists (Albuterol):
IV Sodium Bicarbonate (8.4%):
Caution
Common Diagnostic Trap: Giving shifting agents (Insulin/Dextrose and Albuterol) and assuming the hyperkalemia is resolved. Shifting agents wear off in 2 to 4 hours, causing intracellular potassium to leak back into the extracellular space with rebound fatal arrhythmias unless definitive elimination (diuresis, binders, or dialysis) was initiated simultaneously.
Hyperkalemia: Comprehensive membrane biophysics, EKG gallery, and dialytic removal.
AKI: Acute tubular necrosis and renal electrolyte management.
CRRT: Continuous venovenous hemodiafiltration and dialysate potassium prescription.
Arrhythmias: Conduction blocks, sine wave rhythms, and overdrive pacing.
Cardiac Arrest: ACLS arrest algorithms for hyperkalemia and toxic ingestions.
Evidence status
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From first-line norepinephrine titration to multi-agent vasopressor escalation and inotrope selection.
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From emergent cardiac membrane stabilization to intracellular shifting, elimination, and dialysis triggers.
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Sepsis-AKI microcirculatory decoupling, KDIGO staging, Furosemide Stress Test (FST), urine microscopy, and the AEIOU dialysis threshold framework.
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Stepwise 6-step interpretation algorithm, compensation formulas, albumin-corrected anion gap, delta ratio, and Stewart physicochemical (SID) principles.