A 60-year-old male with chronic kidney disease presents to the ED with generalized weakness. ECG shows peaked T waves. Labs reveal potassium 7.2 mEq/L. Which of the following is the MOST appropriate initial emergent treatment to stabilize the cardiac membrane?

✓ Correct Answer: Option C

Calcium gluconate (or calcium chloride) rapidly stabilizes the cardiac membrane in severe hyperkalemia, especially with ECG changes like peaked T waves, by antagonizing the cardiac effects of potassium, thereby reducing arrhythmia risk.