A client admitted with Diabetic Ketoacidosis (DKA) has a blood glucose of 750 mg/dL, K+ of 2.8 mEq/L, and a pH of 7.18. After initiating insulin infusion, what is the MOST critical electrolyte to monitor closely?

✓ Correct Answer: Option C

In DKA, insulin infusion shifts potassium from the extracellular to the intracellular space, which can profoundly worsen existing hypokalemia. Close monitoring and aggressive potassium replacement are critical to prevent life-threatening cardiac arrhythmias.