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What is the recommended treatment protocol for a patient with severe

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MSt MRCGP.

Posted: 7 September 2026Updated: 7 September 2026 Guideline-Aligned (High Confidence) Clinically Reviewed

Immediate hospital-level management: A potassium of 6.4 mmol/L is below the source’s stated threshold of >6.5 mmol/L requiring immediate attention, but it is close enough to warrant urgent assessment, repeat potassium measurement, 12-lead/continuous ECG monitoring, and measurement of urea, electrolytes, and creatinine.

Stop potassium loading: Withdraw all potassium-containing drugs and discontinue potassium-sparing diuretics.

If ECG changes, arrhythmia, or potassium rises above 6.5 mmol/L: Give IV calcium gluconate 10–20 mL of 10% solution over 1–5 minutes with ECG monitoring; its effect may be transient and repeat dosing may be needed.

Shift potassium intracellularly: Give 10–25% glucose 300–500 mL/hour with up to 10 units of insulin for each 20 g glucose, or give sodium bicarbonate infusion.

Remove potassium: Sodium polystyrene sulphonate may be used for mild hyperkalaemia, and haemodialysis or peritoneal dialysis may be required if initial measures fail.

Monitoring: Recheck potassium every 2–3 hours while raised, use continuous 12-lead ECG monitoring, and observe asymptomatic patients for at least 6 hours.

Educational content only. Always verify information and use clinical judgement.