alexa Hyperthyroidism in a population with Down syndrome (DS).
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Thyroid Disorders & Therapy

Author(s): GodayArno A, CerdaEsteva M, FloresLeRoux JA, ChillaronJordan JJ, Corretger JM, , GodayArno A, CerdaEsteva M, FloresLeRoux JA, ChillaronJordan JJ, Corretger JM,

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Abstract BACKGROUND: Thyroid disorders are frequent in patients with Down syndrome (DS). It is well-known that the prevalence of hypothyroidism is high but data on hyperthyroidism are scarce. OBJECTIVES: To assess the prevalence, aetiology, clinical characteristics, evolution and treatment of hyperthyroidism in a population with DS attending a specialized medical centre. METHODS: Data were gathered by systematic review of 1832 medical records from the Catalan DS Foundation, in Spain, registered between January 1991 and February 2006. Patients with the diagnosis of hyperthyroidism were identified and data on clinical features, physical examination, laboratory and imaging tests, treatment and evolution were collected. RESULTS: Twelve patients with hyperthyroidism were recorded (6.5 cases/1000 patients with DS). There were 5 males and 7 females, with a mean age at diagnosis of 16.8 years. The most common presenting symptoms were decreased heat tolerance, sweating, increased irritability and weight loss. All patients had diffuse goitre at physical examination and two patients presented with exophthalmia. Clinical diagnosis was confirmed biochemically. Thyroid-stimulating immunoglobulin levels were raised (mean 128.1 U/l) and imaging tests confirmed the diagnosis of Graves' disease in all cases. Patients started treatment with carbimazole at diagnosis and after a mean period of 40 months without clinical remission, they required definitive therapy with radioactive iodine. Subjects developed hypothyroidism after radio-iodine therapy and replacement therapy with levothyroxine was necessary. CONCLUSIONS: Hyperthyroidism is more prevalent in patients with DS than in the general population and has no gender predominance. It is caused mainly by Graves' disease. Anti-thyroid drugs were not effective in achieving remission and radioactive iodine as a definitive treatment was required in all cases. This article was published in Clin Endocrinol (Oxf) and referenced in Journal of Thyroid Disorders & Therapy

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