A nurse is collecting data from a 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. An increase in potassium levels is not directly related to the effectiveness of furosemide, which is a diuretic and can actually cause hypokalemia. B. A decrease in edema indicates that the diuretic is effectively removing excess fluid from the body, which is a desired effect of furosemide in treating heart failure. C. An increase in respiratory rate could indicate worsening heart failure or fluid overload, not the effectiveness of the medication. D. A decrease in appetite is not a specific indication of the effectiveness of furosemide.