Time course to hypothyroidism after fixed-dose radioablation therapy of Graves' disease in children.

J Pediatr

Section of Pediatric Endocrinology/Diabetology, Department of Pediatrics, James Whitcomb Riley Hospital for Children, Indianapolis, Indiana 46202, USA.

Published: July 2002

AI Article Synopsis

  • The study aimed to evaluate how hypothyroidism develops in pediatric patients treated with a fixed dose of radioactive iodine (RAI) for Graves' disease.
  • All 40 children reviewed in the study eventually developed permanent hypothyroidism, with an average onset time of about 77 days after treatment.
  • The researchers could not identify specific factors that predict how quickly patients would develop hypothyroidism after receiving RAI, though it was effective for nearly all participants.

Article Abstract

Objective: To characterize the development of hypothyroidism in pediatric patients who receive a fixed dose of radioactive iodine (RAI).

Study Design: Medical records of children treated with fixed-dose RAI for Graves'disease between 1993 and 2001 were reviewed. Multiple variables including sex, age, thyroid hormone levels, thyroid-stimulating immunoglobulin titer, antithyroid medication use, and 24-hour radioiodine uptake were investigated as possible predictive factors for the development of hypothyroidism after treatment. All patients received RAI at a dose of between 13.8 and 15.6 mCi (average, 14.7 mCi; SD, 0.5).

Results: Permanent hypothyroidism developed in all 40 patients, although a second dose of RAI was required in one case. The average time to hypothyroidism was 77 days (SD, 32), with a range of 28 to 194 days; 75% of the patients were diagnosed with hypothyroidism between 40 and 90 days. RAI treatment was ineffective in an additional patient, who required subtotal thyroidectomy.

Conclusions: We conclude that a fixed dose of RAI is effective therapy in nearly all pediatric patients with Graves'disease. Factors predicting the time course to hypothyroidism were not identified.

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Source
http://dx.doi.org/10.1067/mpd.2002.125494DOI Listing

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