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[Osteocalcin and hyperthyroidism].

C Pandolfi1, G Montanari, F Mercantini

  • 1I Divisione Medica, Ospedale Maggiore, Lodi, Milano.

Minerva Endocrinologica
|April 1, 1992
PubMed
Summary
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Hyperthyroidism increases bone turnover, potentially leading to osteoporosis. Monitoring serum osteocalcin (sBGP) helps manage thyroid hormone therapy and prevent bone loss.

Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Thyroid Disorders

Context:

  • Hyperthyroidism elevates bone turnover, with resorption exceeding formation, increasing osteoporosis risk.
  • Thyroid hormone therapy, particularly TSH-suppressive doses, can decrease bone mineral content.
  • Circulating osteocalcin (sBGP) is a validated non-invasive marker for bone turnover in hyperthyroxinemia.

Purpose:

  • To investigate serum osteocalcin (sBGP) levels in hyperthyroid post-menopausal women compared to pre-menopausal women.
  • To assess the persistence of elevated sBGP in hyperthyroid patients during therapy.
  • To examine the relationship between sBGP and thyroid hormone levels (fT4).

Summary:

  • Serum osteocalcin (sBGP) showed an additional increase in hyperthyroid post-menopausal women compared to pre-menopausal women.

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  • Elevated sBGP levels persisted in all hyperthyroid patients after four months of therapy, regardless of etiology.
  • A positive correlation was observed between sBGP levels and free thyroxine (fT4) in hyperthyroid patients.

    • Impact:

    • Monitoring sBGP may aid in optimizing 1-thyroxine therapy, preventing over-treatment and potential bone mineral reduction.
    • This study highlights sBGP as a sensitive indicator of bone turnover in various hyperthyroid states.
    • Findings suggest routine sBGP monitoring for patients on chronic thyroid hormone replacement therapy.