In adult hyperkalemia, which treatment should be given first?

In adult hyperkalemia, which treatment should be given first?

• A. Albuterol: 10 mg Nebulized
• B. Sodium Bicarbonate: 50 mEq IV/IO over 2 min
• C. Calcium Chloride: 1 g IV/IO over 2 min (FIRST)
• D. Normal Saline: 500 ml (if hypotensive)

Answer: (C)

The key idea here is to protect the heart first. In adult hyperkalemia, the immediate priority is to stabilize the myocardium against the dangerous electrical effects of high potassium. Calcium given IV quickly stabilizes cardiac cell membranes and raises the threshold for excitability, which helps prevent life-threatening arrhythmias. It does not lower potassium by itself, but it buys time to safely implement other measures to remove or shift potassium. After calcium, you address the potassium itself: shift potassium into cells (through insulin with glucose, beta-agonists like albuterol, and, if indicated, bicarbonate for acidosis) and increase removal (fluids/diuretics if renal function allows, or renal replacement therapy in severe cases). Calcium is the first step precisely because it protects the heart immediately while you carry out the potassium-lowering strategies.

The key idea here is to protect the heart first. In adult hyperkalemia, the immediate priority is to stabilize the myocardium against the dangerous electrical effects of high potassium. Calcium given IV quickly stabilizes cardiac cell membranes and raises the threshold for excitability, which helps prevent life-threatening arrhythmias. It does not lower potassium by itself, but it buys time to safely implement other measures to remove or shift potassium.

After calcium, you address the potassium itself: shift potassium into cells (through insulin with glucose, beta-agonists like albuterol, and, if indicated, bicarbonate for acidosis) and increase removal (fluids/diuretics if renal function allows, or renal replacement therapy in severe cases). Calcium is the first step precisely because it protects the heart immediately while you carry out the potassium-lowering strategies.