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International Journal of Endocrinology
Volume 2014, Article ID 949068, 6 pages
http://dx.doi.org/10.1155/2014/949068
Clinical Study

Evaluating the Efficacy of Primary Treatment for Graves’ Disease Complicated by Thyrotoxic Periodic Paralysis

1Department of Surgery, The University of Hong Kong, Hong Kong
2Division of Endocrine Surgery, Department of Surgery, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong

Received 16 February 2014; Revised 22 June 2014; Accepted 14 July 2014; Published 3 August 2014

Academic Editor: Andreas Tomaschitz

Copyright © 2014 Rita Yuk-Kwan Chang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. Thyrotoxic periodic paralysis (TPP) is a potentially life-threatening complication of Graves’ disease (GD). The present study compared the long-term efficacy of antithyroid drugs (ATD), radioactive iodine (RAI), and surgery in GD/TPP. Methods. Sixteen patients with GD/TPP were followed over a 14-year period. ATD was generally prescribed upfront for 12–18 months before RAI or surgery was considered. Outcomes such as thyrotoxic or TPP relapses were compared between the three modalities. Results. Eight (50.0%) patients had ATD alone, 4 (25.0%) had RAI, and 4 (25.0%) had surgery as primary treatment. Despite being able to withdraw ATD in all 8 patients for 37.5 (22–247) months, all subsequently developed thyrotoxic relapses and 4 (50.0%) had ≥1 TPP relapses. Of the four patients who had RAI, two (50%) developed thyrotoxic relapse after 12 and 29 months, respectively, and two (50.0%) became hypothyroid. The median required RAI dose to render hypothyroidism was 550 (350–700) MBq. Of the 4 patients who underwent surgery, none developed relapses but all became hypothyroid. Conclusion. To minimize future relapses, more definitive primary treatment such as RAI or surgery is preferred over ATD alone. If RAI is chosen over surgery, a higher dose (>550 MBq) is recommended.