A nurse is reviewing laboratory values of a client with chronic renal failure and discovers the client has a serum potassium of 6.2 mEq/L. Which of the following interventions should the nurse anticipate?

A. Encouraging the client to eat bananas: Bananas are high in potassium and should be avoided in clients with hyperkalemia. Consuming potassium-rich foods can further elevate serum potassium levels, increasing the risk of cardiac complications. B. Administering a potassium-sparing diuretic: Potassium-sparing diuretics, such as spironolactone, can exacerbate hyperkalemia by reducing potassium excretion. They are contraindicated in clients with elevated serum potassium levels, especially those with chronic renal failure. C. Initiating an IV potassium infusion: Administering intravenous potassium would further increase serum potassium levels, posing a significant risk of life-threatening arrhythmias. This intervention is inappropriate for a client already experiencing hyperkalemia. D. Administering sodium polystyrene sulfonate: Sodium polystyrene sulfonate is a cation-exchange resin that binds potassium in the gastrointestinal tract, facilitating its excretion. It is commonly used to treat hyperkalemia in clients with chronic kidney disease, helping to lower serum potassium levels effectively.