Which medication is part of hyperkalemia management in cardiac arrest?

Which medication is part of hyperkalemia management in cardiac arrest?

• A. Epinephrine 0.01 mg/kg
• B. Sodium Bicarbonate 50 mEq IV/IO
• C. Calcium Chloride 1 g IV/IO slow
• D. Albuterol 10 mg Nebulized

Answer: (C)

When hyperkalemia is present during cardiac arrest, the immediate goal is to stabilize the heart’s electrical activity to prevent life-threatening arrhythmias. Calcium does this quickly by stabilizing the myocardial cell membranes. Calcium chloride given IV/IO slowly raises the threshold for depolarization, making cardiac cells less excitable despite high potassium levels. This is a rapid, crucial step that buys time for definitive potassium-reducing measures to be implemented. Calcium’s effect is membrane-stabilizing, not potassium-lowering. It doesn’t lower serum potassium by itself but reduces the risk of dangerous conduction abnormalities right away. The other options can help shift potassium into cells or address acidosis in other contexts, but they don’t provide the same immediate membrane stabilization needed in cardiac arrest with hyperkalemia. Epinephrine is essential for CPR in general but doesn’t specifically treat hyperkalemia. Sodium bicarbonate and beta-agonists like albuterol can be useful adjuncts to move potassium intracellularly, but they are not the primary, immediate stabilizers of the myocardium in this scenario. So, the best choice is calcium chloride.

When hyperkalemia is present during cardiac arrest, the immediate goal is to stabilize the heart’s electrical activity to prevent life-threatening arrhythmias. Calcium does this quickly by stabilizing the myocardial cell membranes. Calcium chloride given IV/IO slowly raises the threshold for depolarization, making cardiac cells less excitable despite high potassium levels. This is a rapid, crucial step that buys time for definitive potassium-reducing measures to be implemented.

Calcium’s effect is membrane-stabilizing, not potassium-lowering. It doesn’t lower serum potassium by itself but reduces the risk of dangerous conduction abnormalities right away. The other options can help shift potassium into cells or address acidosis in other contexts, but they don’t provide the same immediate membrane stabilization needed in cardiac arrest with hyperkalemia. Epinephrine is essential for CPR in general but doesn’t specifically treat hyperkalemia. Sodium bicarbonate and beta-agonists like albuterol can be useful adjuncts to move potassium intracellularly, but they are not the primary, immediate stabilizers of the myocardium in this scenario.

So, the best choice is calcium chloride.