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Effect of long-term L-thyroxine treatment on bone mineral density in young adults with congenital hypothyroidism
Ist Teil von
European journal of endocrinology, 2004-12, Vol.151 (6), p.689
Ort / Verlag
England
Erscheinungsjahr
2004
Quelle
MEDLINE
Beschreibungen/Notizen
To evaluate whether long-term L-thyroxine therapy in young adults with congenital hypothyroidism may affect bone mineral density (BMD).
Thirty-seven subjects with congenital hypothyroidism, detected by neonatal screening and longitudinally followed from the time of diagnosis and treatment (26+/-4 days) up to the age of 17.8+/-1.0 years, were studied.
Spinal (L2-L4) BMD, measured by dual-energy X-ray densitometry, and bone quality, measured as amplitude-dependent speed of sound (Ad-SoS) by quantitative ultrasound, were evaluated.
Z-score mean values (+/-s.d.) of BMD (-0.3+/-0.7) and Ad-SoS (-0.7+/-1. 1) were slightly below the average but within the normal range. Ad-SoS resulted in a z-score below -1 in 38% of patients as compared with BMD which resulted in a z-score below -1 in only 13.5% of subject. No significant differences were observed between males (BMD, -0.3+/-0.7; Ad-SoS, -0.9+/-1.0) and females (BMD, -0.3+/-0.7; Ad-SoS, -0.5+/-1.2) or when dividing patients on the basis of aetiological defects; ectopic gland (BMD, -0.3+/-0.6; Ad-SoS, -0.8+/-0.9), athyreosis (BMD, -0.3+/-0.9; Ad-SoS, -0.8+/-1.0) and eutopic gland (BMD, -0.3+/-0.8; Ad-SoS, -0.4+/-1.3). No significant relationships were observed between BMD or Ad-SoS z-score and hormonal status or L-thyroxine dosages at the time of the study or during the pubertal period.
The careful monitoring of serum thyroid-stimulating hormone and adjustment of l-thyroxine dosage avoided the significant deleterious effects of prolonged L-thyroxine replacement therapy on bone tissue in adolescents and young adults with congenital hypothyroidism treated from the neonatal period.