IBCC Episode 67 - Hypokalemia

Hypokalemia management requires balancing substantial intracellular deficits against the risks of rapid extracellular repletion. Because potassium shifts are complex, clinicians should prioritize oral or enteral routes for safety, reserving IV administration for severe cases or patients with impaired gut function. While traditional dogma suggests maintaining potassium levels above 4.0 mmol/L in cardiac patients, recent evidence indicates that 3.5 to 4.0 mmol/L is often sufficient and safer. Refractory hypokalemia frequently stems from concomitant hypomagnesemia, necessitating aggressive magnesium replacement to stabilize cardiac rhythms. Although hospital protocols often restrict IV potassium to 20 mEq per hour, higher infusion rates are clinically viable in emergent scenarios—such as severe arrhythmias or high-dose insulin therapy—provided the patient receives frequent, diligent monitoring of serum levels and telemetry to prevent dangerous toxicity.