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Effect of lifelong iodine supplementation on thyroid 131-I uptake: a decrease in uptake in euthyroid but not hyperthyroid individuals compared to observations 50 years ago.

Journal article
Authors Mille Milakovic
Gertrud Berg
Robert Eggertsen
Ernst Nyström
Published in European journal of clinical nutrition
Volume 60
Issue 2
Pages 210-3
ISSN 0954-3007
Publication year 2006
Published at Institute of Medicine, School of Public Health and Community Medicine
Institute of Medicine, Department of Internal Medicine
Institute of Clinical Sciences
Pages 210-3
Language en
Links dx.doi.org/10.1038/sj.ejcn.1602290
Keywords iodine supplementation, radioiodine uptake, scintigraphy
Subject categories Medical and Health Sciences

Abstract

BACKGROUND: In Sweden, iodine has been added to table salt (10 mg/kg) since 1936; this amount was increased in 1966 to 50 mg/kg. OBJECTIVE: To investigate a euthyroid Swedish population (n = 44, 60-65 years) with its entire lifespan with iodine supplementation as for 24-h 131-I uptake (24 h IU) and thyroid nodularity (thyroid scintigraphy). To compare the euthyroid 24 h IU with uptake of thyrotoxic individuals, and with observations from 1955. METHODS: The 24 h IU was used in euthyroid individuals after oral administration of 0.1 MBq/2.7 microCi radioiodine and imaging of the thyroid gland was carried out using 99mTc-pertechnetate. RESULTS: In 1999-2000, the mean 24 h IU in the euthyroid individuals was 21% (range 11-33%) and the normal (central 95%) reference interval was 14-30%. Scintigraphy suggested multinodular goitre in three euthyroid individuals. In Graves' patients (n = 53, 50-65 years), the mean 24 h IU was 61% (range 29-89%). In 1955, the 24 h IU in euthyroid individuals was higher (38%, range 10-70%), while hyperthyroid patients had uptake values similar to those recorded in the present investigation (mean 62%, range 40-90%). CONCLUSIONS: The population sample studied had to be small for ethical reasons. We conclude that the reference interval for 24 h IU is 14-30% in this population that had spent its entire lifespan with iodine supplementation. This is lower than that recorded in a Swedish euthyroid population half a century ago having had low-grade table-salt iodine supplementation for 20 years. Values for hyperthyroid patients, however, do not appear to have been affected likewise.

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