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Effective Iodide Therapy for Untreated Patients With Graves' Hyperthyroidism Avoiding Thionamide Drugs With Many Side Effects

NCT04686006 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 504

Last updated 2020-12-28

No results posted yet for this study

Summary

As the drug treatment of Graves' hyperthyroidism, Plummer reported the effectiveness of excess iodide in 1923 and iodide was used as the therapy for Graves' hyperthyroidism starting from the 1930s. After the introduction of more potent antithyroid drug, thionamide, most thyroidologists preferred to use thionamide expecting potent antithyroid effect, but some careful thyroidologists continued to prescribe iodide in mild type Graves' hyperthyroidism. Recently, American and Europe Thyroid Association recommended methylmercaptoimidazole (MMI), one of the potent thionamide drugs, as the first-choice drug for Graves' hyperthyroidism. However, it became apparent that thionamide has serious side effects such as not only agranulocytosis, but also severe liver injury, MPO-ANCA related vasculitis and embryopathy in the pregnant women. In Japan, one patient died of thionamide-induced agranulocytosis every year. The incidence of side effects including minor side effect of drug eruption is more than 10%. We used to treat the patients with Graves' hyperthyroidism with MMI, as we reported in J Clin Endocrinol Metab 65:719, 1987. However, many side effects of thionamide prompted us to revive the treatment with classical KI in our outpatient clinic and found that KI was effective in the patients who showed side effects to thionamide, resulting in remission (reported in J Clin Endocrinol Metab 99:3995, 2014). Therefore, we began to treat the patients without serious complications such as heart failure or arrhythmia, with 100mg KI since 1996 and followed for 180 days. We were surprised to find that serum thyroid hormone level decreased in all the patients. Thionamide drugs were added only when euthyroidism could not be achieved by KI alone. Compared with thionamide, side effect of KI was almost none. Between 1996 and 2004, about 504 patients were treated with KI and a third of the patients were successfully treated with KI alone and other patients were also successfully treated with the combination of KI and thionamide, suggesting additive effect, or by radioactive iodine therapy. The long term prognosis of the patients initially treated with KI was almost the same as the patients initially treated with MMI. Our clinical experience suggested that patients with Graves' hyperthyroidism are also susceptible to excess iodide, as in the cases with Hashimoto thyroiditis, and this suppressive effect of excess iodide on the thyroid gland is a useful information for many patients suffering from Graves' hyperthyroidism and thionamide side effects.

Conditions

  • Graves Disease

Interventions

DRUG

Potassium Iodide

Sponsors & Collaborators

  • Kyushu University

    lead OTHER

Eligibility

Min Age
15 Years
Max Age
90 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
1996-04-01
Primary Completion
2005-07-01

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This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04686006 on ClinicalTrials.gov