long-term carbimazole pretreatment reduces the efficacy of radioiodine therapy
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ID: 132681
2015
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Abstract
Introduction: Data from several studies suggest that pretreatment with antithyroid drugs (ATD) before 131 I increases the risk of treatment failure. This effect has been demonstrated more consistently with propylthiouracil than with carbimazole (CMZ) or methimazole (MMI). Men with Graves′ disease (GD) have a lower rate of remission with 131 I compared to women and the impact of long-term ATD pretreatment on the success of 131 I is unknown. The objective of our study was to compare the efficacy of fixed doses of radioiodine between patients with and without long-term CMZ pretreatment. Materials and Methods: We performed a retrospective study on 335 male patients with GD treated with 131 I from 1998 to 2008. 148 patients had been pretreated with CMZ, and the remaining 187 patients received 131 I without pretreatment. We compared the success rate of a single dose of 131 I, between patients with and without long-term CMZ pretreatment. Results: The success rate of a single dose of 131 I was significantly higher in patients without pretreatment than in patients who were pretreated with CMZ (91.4% vs. 82.3%, P = 0.01). The rate of hypothyroidism in the first 6 months after 131 I therapy was significantly higher in patients without pretreatment (55.1% vs. 44.6%, P = 0.05). There was also a trend for higher cumulative rate of hypothyroidism at last follow-up in nonpretreated patients (78.1% vs. 69.7%). Conclusion: Male patients with Graves′ hyperthyroidism pretreated with CMZ have lower efficacy with 131I therapy compared to nonpretreated patients. CMZ pretreatment given for a prolonged period reduces the efficacy of 131 I therapy.
| Reference Key |
shivaprasad2015indianlong-term
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|---|---|
| Authors | ;C Shivaprasad;K M Prasanna Kumar |
| Journal | journal of physical chemistry a |
| Year | 2015 |
| DOI |
10.4103/2230-8210.146865
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