What is the recommended IV calcium gluconate dosage and onset time in hyperkalemia?

• A. Calcium gluconate 2-4 grams IV over 30 minutes; onset 10-20 minutes
• B. Calcium chloride 10 mEq IV push; onset 0-5 minutes
• C. Calcium gluconate 0.5-1 gram IV over 5 minutes; onset 5-10 minutes
• D. Calcium gluconate 1-2 grams IV over 10 minutes; onset 1-2 minutes

Answer: (D)

Stabilizing the heart quickly is the immediate priority in hyperkalemia. IV calcium protects cardiac membranes and does not lower potassium itself, so you want a rapid, safe calcium salt to flash-stabilize the myocardium while you address the potassium level. Calcium gluconate given in a 1–2 gram IV dose over about 10 minutes provides that quick membrane stabilization, with effects appearing within roughly 1–2 minutes. This aligns with common practice for immediate cardioprotection in hyperkalemia and is safer for peripheral IV access than calcium chloride, which is more caustic and often reserved for central-line use or specific situations. The other dosing options either use a different calcium salt (calcium chloride) or propose slower, lower-dose regimens that don’t furnish the same rapid cardiac protection.