The nurse is caring for a client who is experiencing pulmonary edema. The client is treated with furosemide. What will the nurse monitor most closely?

A. Sodium levels: While sodium levels should be monitored, furosemide is more likely to cause imbalances in potassium levels rather than sodium levels. Monitoring potassium is more crucial due to the risk of hypokalemia from diuretics like furosemide. B. Bone marrow function: Bone marrow function is not typically affected by furosemide. While some medications may cause bone marrow suppression, this is not a common concern with furosemide use. C. Calcium levels: Furosemide can affect calcium balance, but it is more commonly associated with hypocalcemia (low calcium) rather than hypercalcemia. However, potassium levels are a more immediate concern. D. Potassium levels: Furosemide is a loop diuretic that increases potassium excretion, leading to a high risk of hypokalemia (low potassium levels). This can cause serious complications like arrhythmias, making potassium monitoring the most important in this case.