THE EXTRATHYROIDAL DISTRIBUTION OF 131I THYROXINE

ABSTRACT The elimination of radioactivity from the blood stream has been examined in 6 subjects after intravenous administration of 131I-thyroxine. About 50 per cent of the radioactivity left the blood within 60–90 minutes and 75 per cent within 6 hours. In both in vivo and in vitro experiments ther...

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Published inEuropean journal of endocrinology Vol. 48; no. 4; pp. 536 - 546
Main Authors Blomstedt, B., Plantin, L. O.
Format Journal Article
LanguageEnglish
Published 01.04.1965
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Abstract ABSTRACT The elimination of radioactivity from the blood stream has been examined in 6 subjects after intravenous administration of 131I-thyroxine. About 50 per cent of the radioactivity left the blood within 60–90 minutes and 75 per cent within 6 hours. In both in vivo and in vitro experiments there was a rapid linking of the labelled thyroxine to the serum proteins. The elimination of radioactivity from the blood and the excretion in urine and faeces was followed in 12 subjects for 12 days. To calculate the distribution and exchange of the labelled thyroxine between the various extrathyroidal pools, a model comprising 4 pools was constructed. The working of the model was analysed by means of an analogue computer. There was a close agreement between the curves thus obtained and those yielded by empirical methods. According to the 4-pool model 6 – 7 times the intravascular thyroxine pool was exchanged with the extravascular pool in 24 hours.
AbstractList ABSTRACT The elimination of radioactivity from the blood stream has been examined in 6 subjects after intravenous administration of 131 I-thyroxine. About 50 per cent of the radioactivity left the blood within 60–90 minutes and 75 per cent within 6 hours. In both in vivo and in vitro experiments there was a rapid linking of the labelled thyroxine to the serum proteins. The elimination of radioactivity from the blood and the excretion in urine and faeces was followed in 12 subjects for 12 days. To calculate the distribution and exchange of the labelled thyroxine between the various extrathyroidal pools, a model comprising 4 pools was constructed. The working of the model was analysed by means of an analogue computer. There was a close agreement between the curves thus obtained and those yielded by empirical methods. According to the 4-pool model 6 – 7 times the intravascular thyroxine pool was exchanged with the extravascular pool in 24 hours.
ABSTRACT The elimination of radioactivity from the blood stream has been examined in 6 subjects after intravenous administration of 131I-thyroxine. About 50 per cent of the radioactivity left the blood within 60–90 minutes and 75 per cent within 6 hours. In both in vivo and in vitro experiments there was a rapid linking of the labelled thyroxine to the serum proteins. The elimination of radioactivity from the blood and the excretion in urine and faeces was followed in 12 subjects for 12 days. To calculate the distribution and exchange of the labelled thyroxine between the various extrathyroidal pools, a model comprising 4 pools was constructed. The working of the model was analysed by means of an analogue computer. There was a close agreement between the curves thus obtained and those yielded by empirical methods. According to the 4-pool model 6 – 7 times the intravascular thyroxine pool was exchanged with the extravascular pool in 24 hours.
Author Plantin, L. O.
Blomstedt, B.
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Snippet ABSTRACT The elimination of radioactivity from the blood stream has been examined in 6 subjects after intravenous administration of 131I-thyroxine. About 50...
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