Outcome of pediatric Graves' disease after treatment with antithyroid medication and radioiodine.
OBJECTIVE
To evaluate the efficacy of antithyroid medication in the initial treatment of pediatric Graves' disease and the frequency of use and outcome of radioiodine as second-line therapy.


METHODS
Retrospective review.


METHODS
Tertiary care children's hospital.


METHODS
Thirty-three patients (29 female, 4 male; mean age 12.7 years) who started treatment for hyperthyroidism between Jan. 1, 1990, and Dec. 31, 1994.


METHODS
Initial treatment with propylthiouracil or methimazole (with addition of levothyroxine if needed to maintain euthyroidism); subsequent treatment with radioiodine.


METHODS
1) Clinical and laboratory features at the time of diagnosis; 2) doses and duration of antithyroid drug treatment and response to treatment; 3) need for treatment with levothyroxine to maintain euthyroidism during the trial of antithyroid medication; 4) indications for radioiodine therapy, and the dose and number of treatments with 131iodine (131I); 5) thyroid status at last follow-up visit (at least 2 years after diagnosis).


RESULTS
All patients were initially treated with antithyroid drugs, and levothyroxine was added in 16 subjects to maintain euthyroidism. The median duration of drug treatment was 21 months. Ultimately, 24/33 patients (73%) received radioiodine following a trial of antithyroid drugs because of a) side effects of antithyroid medication (in 3 patients); b) inadequate response to medication (in 8 patients); and c) relapse (in 13 patients), which occurred at a median of 6 (range 1 to 16) months following cessation of drug therapy. Five patients required a second dose of radioiodine and 2 patients required 3 doses. Of the 24 patients treated with radioiodine, at last follow-up after the most recent treatment (median 18.5, range 3 to 55 months), 6 patients were euthyroid, 16 required thyroxine replacement, and 2 were-still, or again, hyperthyroid.


CONCLUSIONS
In our population of children and adolescents, treatment of hyperthyroidism with antithyroid drugs frequently resulted in either side effects, inadequate response to medication or subsequent relapse, all of which led to radioiodine therapy. We conclude, therefore, that radioiodine could be considered as one of the first-line options in older children and adolescents with hyperthyroidism.
Ward
L
L
Department of Medical Imaging, Hôpital Sainte-Justine, Université de Montréal, Quebec.
Huot
C
C
Lambert
R
R
Deal
C
C
Collu
R
R
Van Vliet
G
G
D000293:Adolescent; D000328:Adult; D013956:Antithyroid Agents / Q000009:adverse effects / Q000627:therapeutic use*; D002648:Child; D003131:Combined Modality Therapy; D004341:Drug Evaluation; D005260:Female; D006111:Graves Disease / Q000188:drug therapy*; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D008297:Male; D008713:Methimazole / Q000009:adverse effects / Q000627:therapeutic use*; D011433:Propranolol / Q000627:therapeutic use; D011441:Propylthiouracil / Q000009:adverse effects / Q000627:therapeutic use*; D012189:Retrospective Studies; D013974:Thyroxine / Q000627:therapeutic use; D016896:Treatment Outcome
D013956:Antithyroid Agents; D007457:Iodine Radioisotopes; D008713:Methimazole; D011441:Propylthiouracil; D011433:Propranolol; D013974:Thyroxine