The importance of reverse triiodothyronine in hypothyroid children on replacement treatment.

Abstract:

:Reverse triiodothyronine (rT3), triiodothyronine (T3), thyroxine (T4), and thyroid stimulating hormone (TSH) values were measured by radioimmunoassay in 40 children with congenital hypothyroidism who were being given levothyroxine (0.05-0.35 mg/day) and in 14 normal controls. In 15 of the children with hypothyroidism the treatment, judged by serum T4 and TSH values and thyrotrophin releasing hormone (TRH) test, seemed to be adequate and their mean rT3 value and rT3:T4 ratio were comparable with the controls. The remaining 25 children had a raised serum T4 and a low TSH value. Only 4 (16%) of these children had an abnormally high T3 concentration but the rT3 value was raised in 23 (92%) and their mean rT3 value and rT3:T4 ratio were significantly higher than in the control children. Less than 20% of this 'overtreated' group, however, had clinical hyperthyroidism. We suggest that in patients on T4 replacement treatment the peripheral thyroid homeostatic mechanisms produce larger amounts of rT3, thereby preventing high T3 values where serum T4 values are raised. This may explain why the 'overtreated' children showed no clinical evidence of hyperthyroidism. These findings emphasise the protective and selective role of peripheral monodeiodination.

journal_name

Arch Dis Child

authors

Desai M,Irani AJ,Patil K,Pandya CS

doi

10.1136/adc.59.1.30

subject

Has Abstract

pub_date

1984-01-01 00:00:00

pages

30-5

issue

1

eissn

0003-9888

issn

1468-2044

journal_volume

59

pub_type

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