A 50-year-old man with a history of end-stage renal disease on hemodialysis presents to the emergency department with generalized weakness and palpitations. His EKG shows widened QRS complexes and peaked T waves. Laboratory results show a potassium level of 7.2 mEq/L. Which of the following is the most immediate intervention to stabilize the cardiac membrane?
✓ Correct Answer: Option C
The patient has severe hyperkalemia with EKG changes. Calcium gluconate is the most immediate intervention to stabilize the cardiac membrane and prevent life-threatening arrhythmias, although it does not lower serum potassium levels.