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  • Title: Bone metabolism in children with congenital hypothyroidism--a longitudinal study.
    Author: Verrotti A, Greco R, Altobelli E, Morgese G, Chiarelli F.
    Journal: J Pediatr Endocrinol Metab; 1998; 11(6):699-705. PubMed ID: 9829223.
    Abstract:
    In order to evaluate the effect of thyroid replacement therapy on bone metabolism in congenital hypothyroid children, we studied 23 (10 girls and 13 boys) consecutive patients. Their age ranged from 3 to 8 weeks. One of these patients had familiar dyshormonogenesis, 21 had ectopic glands and one hemiagenesis. As a control group, we studied 46 sex- and age-matched healthy newborns. Before the beginning of therapy, the hypothyroid patients showed higher values of calcium (2.78 +/- 0.04 vs 2.65 +/- 0.07 mmol/l; p < 0.05) and of 1,25-dihydroxy-vitamin D (159.7 +/- 31.6 vs 90.5 +/- 33.1 ng/l; p < 0.01), while they showed lower values of osteocalcin (1.9 +/- 0.8 vs 2.9 +/- 0.9 ng/ml; p < 0.01) than controls. After 3 months of therapy, we found a complete normalization of all these parameters and a progressive increase of osteocalcin. Our data show that in congenital hypothyroid children there are abnormalities in calcium metabolism which seem to be transient and reversible after L-thyroxine replacement therapy.
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