A client with diabetic ketoacidosis has a serum potassium of 3.0 mEq/L. The physician prescribes an insulin infusion and IV potassium. What should the nurse do?

Appeared in: NORCET-11 Mains

Explanation

In Diabetic Ketoacidosis (DKA), patients often have a total body potassium deficit, even if initial serum levels appear normal or high due to acidosis.
Insulin therapy drives potassium from the extracellular space back into the cells, which can rapidly worsen hypokalemia.
If a patient's initial serum potassium is less than 3.5 mEq/L, potassium replacement must precede the administration of insulin.
Administering insulin first or simultaneously in this scenario can precipitate life-threatening cardiac arrhythmias and respiratory muscle weakness.

Option A: Insulin shifts potassium intracellularly. Giving insulin first to a patient who is already hypokalemic will cause a precipitous drop in serum potassium, leading to fatal cardiac arrhythmias.
Option C: Simultaneous administration does not allow enough time for the serum potassium to reach a safe level before insulin exerts its intracellular shifting effect.
Option D: Starting insulin in the presence of severe hypokalemia is dangerous. Rechecking after an hour would be too late to prevent life-threatening complications like cardiac arrest.

Clinical Relevance

Nursing practice connection: Knowing Management of hypokalemia in Diabetic Ketoacidosis (DKA) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Continuous cardiac monitoring is essential for patients in DKA, especially when correcting electrolyte imbalances, to detect early signs of hypokalemia (e.g., flattened T waves, U waves) or hyperkalemia.
What if? If the patient's initial serum potassium was 4.5 mEq/L, the nurse would start the insulin infusion and add potassium to the IV fluids simultaneously to prevent hypokalemia as the acidosis resolves.

How to Approach the Question

Identify the patient's diagnosis (DKA) and the critical lab value provided (potassium 3.0 mEq/L).
Recall the physiological effect of insulin on potassium: insulin drives potassium into the cells, lowering serum levels.
Recognize that a potassium level of 3.0 mEq/L is already dangerously low (normal is 3.5 to 5.0 mEq/L).
Conclude that giving insulin would worsen the hypokalemia, so potassium must be replenished first before starting the insulin infusion.

Concept Tested & Keywords

Concept Tested: Management of hypokalemia in Diabetic Ketoacidosis (DKA)
Stem keywords: Diabetic ketoacidosis, serum potassium of 3.0 mEq/L, insulin infusion, IV potassium
Lead-in keywords: What should the nurse do
Clinical cues: Serum potassium of 3.0 mEq/L indicates severe hypokalemia, which is a critical priority before initiating insulin therapy.

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 569-570

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1333

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