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American Journal of Clinical Nutrition, Vol 57, 267S-270S, Copyright © 1993 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

The epidemiology of iodine-deficiency disorders in relation to goitrogenic factors and thyroid-stimulating-hormone regulation

CH Thilly, B Swennen, P Bourdoux, K Ntambue, R Moreno-Reyes, J Gillies and JB Vanderpas
Cemubac Medical Team, Free University of Brussels, Belgium.

In children aged 5-7 y from goiter-endemic areas in Ubangi, Zaire, and Ntcheu, Malawi, mean serum thyroxin (T4) concentrations were 53 +/- 49 vs 81 +/- 33 nmol/L (P < 0.05), and thyroid-stimulating hormone (TSH) values were 24.3 +/- 9.6 vs 4.5 +/- 3.3 mU/L respectively (P < 0.01); mean urinary iodine concentrations were 0.14 +/- 0.02 vs 0.09 +/- 0.02 mumol/L, and mean thiocyanate concentrations were 0.33 +/- 0.05 vs 0.17 +/- 0.05 nmol/L, respectively (P < 0.05). Mean serum selenium concentrations were 0.343 +/- 0.176 mumol/L in Ubangi and 0.437 +/- 0.178 mumol/L in Ntcheu (P < 0.05). In two groups of 11 adolescent girls from Ubangi, the mean values for excretion of urinary iodine were 1.31 +/- 0.14 and 0.58 +/- 0.17 mumol/L (P < 0.05) after a meal of cassava or a control meal of rice, respectively. In euthyroid subjects from Ubangi, mean serum TSH for a given serum T4 was approximately twice as high for children aged < 15 y than for those aged 16-25 y. The high frequency of myxedematous cretins observed in Ubangi very probably result from both severe iodine and selenium deficiency together with thiocyanate overload.


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