A client with congestive heart failure is prescribed a beta-blocker. The nurse should closely monitor the client for which potential adverse effect of this medication?

A) This choice is incorrect because serum sodium levels are not directly impacted by digoxin. However, electrolyte imbalances, including hypokalemia, can potentiate digoxin toxicity, so potassium levels should be monitored.

B) This choice is incorrect because while digoxin can impact liver function, it is not the primary parameter to be monitored. Liver function tests may be performed periodically to assess liver health during digoxin therapy.

C) This choice is correct. Digoxin is a cardiac glycoside that can impact renal function. Monitoring urine output is essential to assess kidney function and the client's response to the medication.

D) This choice is incorrect because blood glucose levels are not specifically impacted by digoxin. However, hypokalemia resulting from digoxin therapy can cause alterations in glucose metabolism, so blood glucose levels should be monitored in clients taking digoxin.

A) This choice is incorrect because hypernatremia (high sodium levels) is not a common adverse effect of loop diuretics. Loop diuretics primarily impact sodium and water excretion.

B) This choice is incorrect because hyperkalemia (high potassium levels) is not typically associated with loop diuretics. In fact, loop diuretics can lead to increased potassium excretion, potentially causing hypokalemia.

C) This choice is incorrect because hypocalcemia (low calcium levels) is not a common adverse effect of loop diuretics. Loop diuretics primarily affect sodium, potassium, and water excretion.

D) This choice is correct. Loop diuretics are potent potassium-wasting diuretics, meaning they increase potassium excretion in the urine, potentially causing hypokalemia. The nurse should closely monitor the client's potassium levels and provide potassium supplementation if necessary.