LETTER TO FRONTIERS OF MEDICINE |
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Sensitivity of supplementation of thyroid hormone on treatment of idiopathic short-stature children during therapy with recombinant human growth hormone |
Wei Wang1,2(), Shuqin Jiang2, Zhirui Cui2, Xiangyang Luo2, Lingli Shi2, Heli Zheng2 |
1. Pediatric Endocrinology Clinic, Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China 2. Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China |
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Abstract This study aimed to evaluate the effects of thyroid hormone supplementation on growth rate of children with idiopathic short stature (ISS) and low-normal serum free thyroxine FT4 who were receiving growth hormone therapy. We selected 64 prepubertal children with FT4 levels in the lowest third of the normal range as the lower FT4 group, and these children were divided randomly into two subgroups: L-thyroxine (L-T4)-treated subgroup was treated with L-T4 (0.5–3.0 g/(kg·d)) from the beginning of the study, and the non-L-T4-treated subgroup received placebo. We also selected 39 ISS children with FT4 in the upper two-thirds of the normal range as the higher FT4 group. During the first year, the lower FT4 group featured lower FT3, FT4, thyroid stimulating hormone (TSH), and insulin-like growth factor-I standard deviation score (IGF-I SDS) and significantly lower height velocity (HV) compared with the higher FT4 group. However, in the lower FT4 group, the L-T4-treated subgroup presented higher FT4, FT3, TSH, and IGF-I SDS concentrations and significantly higher HV compared with children in the non-L-T4-treated subgroup. In children with ISS, the negative effect of thyroid hormone deficiency on growth rate should be considered when FT4 level lies in the low-normal range prior to recombinant human growth hormone treatment.
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Keywords
therapeutic
idiopathic short-stature children
free T4
the first year
recombinant human growth hormone
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Corresponding Author(s):
Wei Wang
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Just Accepted Date: 15 January 2018
Online First Date: 09 April 2018
Issue Date: 29 September 2018
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