NCLEX RN Questions Medical Surgical Nursing Related

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The client's serum potassium level is elevated in acute renal failure, and the nurse administers sodium polystyrene sulfonate (Kayexalate). This drug acts to:

  • A. Increase potassium excretion from the colon.
  • B. Release hydrogen ions for sodium ions.
  • C. Increase calcium absorption in the colon.
  • D. Exchange sodium for potassium ions in the colon.
Correct Answer: D

Rationale: Kayexalate exchanges sodium for potassium in the colon, reducing serum potassium levels in acute renal failure.