Why should potassium levels be monitored before and during IV insulin therapy?

Why should potassium levels be monitored before and during IV insulin therapy?

• A. Insulin drives potassium into cells, risking hypokalemia
• B. Insulin increases potassium excretion
• C. Insulin reduces potassium absorption in the gut
• D. Insulin raises potassium production in the liver

Answer: (A)

Potassium moves into cells when insulin is present, so initiating IV insulin therapy can cause serum potassium to fall rapidly. This makes monitoring potassium before and during treatment essential to prevent hypokalemia, which can lead to dangerous heart rhythm problems. In states like diabetic ketoacidosis, total body potassium is often depleted even if the starting serum level appears normal or high; insulin drives the remaining potassium into cells, revealing or worsening a deficit, so potassium supplementation may be needed as therapy continues. The other statements aren’t correct because insulin does not increase potassium excretion, reduce gut absorption, or increase liver potassium production.

Potassium moves into cells when insulin is present, so initiating IV insulin therapy can cause serum potassium to fall rapidly. This makes monitoring potassium before and during treatment essential to prevent hypokalemia, which can lead to dangerous heart rhythm problems. In states like diabetic ketoacidosis, total body potassium is often depleted even if the starting serum level appears normal or high; insulin drives the remaining potassium into cells, revealing or worsening a deficit, so potassium supplementation may be needed as therapy continues. The other statements aren’t correct because insulin does not increase potassium excretion, reduce gut absorption, or increase liver potassium production.