Which electrolyte imbalance does kayexalate (sodium polysteyrene) treat?

A. Hyperchloremia: Hyperchloremia is an elevated serum chloride level, usually caused by dehydration, renal dysfunction, or excessive saline administration. Kayexalate does not bind chloride ions and therefore has no therapeutic effect on this electrolyte imbalance. B. Hyperphosphatemia: Hyperphosphatemia occurs when serum phosphate levels rise, often due to renal failure or excessive phosphate intake. Sodium polystyrene sulfonate does not bind phosphate ions, so it is not indicated for treating elevated phosphate levels. C. Hyperkalemia: Kayexalate (sodium polystyrene sulfonate) is a cation-exchange resin that binds potassium ions in the gastrointestinal tract in exchange for sodium. This process facilitates the removal of excess potassium through feces, lowering serum potassium levels and preventing complications such as cardiac arrhythmias associated with hyperkalemia. D. Hypermagnesemia: Hypermagnesemia is an elevated serum magnesium level, often related to renal insufficiency or excessive magnesium intake. Kayexalate does not remove magnesium from the body and is therefore ineffective in treating this electrolyte disorder.