A 55-year-old man with a history of chronic kidney disease presents with generalized weakness and fatigue. An electrocardiogram (ECG) shows tall, peaked T waves. Laboratory results reveal a serum potassium level of 7.2 mEq/L. What is the most important immediate intervention to stabilize the cardiac membrane?
✓ Correct Answer: Option C
In severe hyperkalemia with ECG changes (like peaked T waves), intravenous calcium gluconate is the immediate priority. It directly stabilizes the cardiac membrane, reducing the risk of arrhythmias, without lowering serum potassium levels.