A Patient with Graves' Disease Is Prepared for Surgery with Drug

A patient with Graves' disease is prepared for surgery with drug therapy consisting of 4 weeks of propylthiouracil (PTU) and 10 days of iodine before surgery. When teaching the patient about the drugs, the nurse explains that the drugs are given preoperatively to

A) eliminate the risk for tetany during the postoperative period.
B) decrease the risk of hypometabolism during and after the surgery.
C) normalize metabolism and decrease the size and vascularity of the gland.
D) assist in differentiating the thyroid and parathyroid glands during surgery.

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