A nurse is caring for a newly admitted patient who will receive Digoxin to treat cardiac dysrhythmia.The patient takes hydrochlorothiazide and reports regular use of OTC laxatives.Before administering the first dose of Digoxin, the nurse will review the patient’s electrolyte levels with careful attention to which electrolytes?

Choice A rationaleCalcium and magnesium imbalances are less likely to influence Digoxin's effects compared to potassium and magnesium.Choice B rationaleWhile chloride levels are important, potassium is more critical due to its significant impact on Digoxin’s action.Choice C rationaleCorrect, potassium and magnesium levels are crucial as imbalances can potentiate Digoxin toxicity or reduce its efficacy.Choice D rationaleSodium and calcium imbalances are less directly related to Digoxin efficacy compared to potassium and magnesium.