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 can cause a decrease in potassium levels, so an increase in potassium would not be expected. B. Furosemide helps improve cardiac output by reducing fluid overload, not decreasing it. C. A decrease in peripheral edema indicates that the furosemide (a diuretic) is effectively reducing fluid retention, which is a sign that the medication is working. D. Furosemide typically reduces venous pressure by promoting diuresis, so an increase in venous pressure would indicate a problem.