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THE USE OF RADIOACTIVE IODINE IN THE TREATMENT OF GRAVES' DISEASE
Authors:Myron Prinzmetal  Clarence M. Agress  H. C. Bergman  Benjamin Simkin
Abstract:Fifty patients with uncomplicated Graves'' disease were treated with radioactive iodine (I131). Twenty-six patients who were followed for one year or longer are the basis of this report. Twenty-five are now euthyroid; only one is not completely well.The total dose of radioiodine administered varied from 0.5 to 10 millicuries. The average length of time necessary for return to a euthyroid state was from three to four months.Hypometabolism developed in three patients, and in one the signs and symptoms of myxedema developed. No other complications ensued. One patient who apparently relapsed had complete return to normal after further iodine administration.The determination of the uptake of radioactive iodine by the thyroid gland is a useful diagnostic procedure in differentiating conditions simulating hyperthyroidism.Following treatment with radioactive iodine, the thyroid gland becomes smaller, the uptake of iodine by the gland is reduced, and the level of organic iodine in the plasma becomes normal.In acute thyroiditis, in spite of a high basal metabolic rate, high content of organic iodine in the plasma and other evidences of “hyperthyroidism,” the uptake of I131 has been very low.
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