A nurse is assessing a school-age child who has heart failure and is taking furosemide. Which of the following findings should the nurse identify as an indication that the medication is effective?

A. Furosemide is a diuretic that helps to reduce fluid volume, which would lead to a decrease in venous pressure, not an increase. B. Furosemide is primarily used to reduce fluid retention (edema). A decrease in peripheral edema indicates that the medication is working effectively. C. Furosemide can actually cause hypokalemia (low potassium levels) as a side effect. D. Furosemide is used to improve cardiac output by reducing the fluid overload that puts a strain on the heart.