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[Phosphorus-calcium metabolism in hyperthyroidism].

M Popelier1, B Jollivet, B Fouquet

  • 1Service de Médecine B, Endocrinologie, Hôpital Bretonneau, CHU, Tours.

Presse Medicale (Paris, France : 1983)
|April 14, 1990
PubMed
Summary
This summary is machine-generated.

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Hyperthyroidism alters calcium and phosphorus metabolism, increasing bone remodelling markers like osteocalcin. This leads to hypercalciuria and reduced calcium absorption, contributing to a negative calcium balance.

Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Calcium Homeostasis

Context:

  • Hyperthyroidism significantly impacts calcium-phosphorus metabolism due to increased bone remodeling.
  • Graves' disease, a common cause of hyperthyroidism, affects various metabolic parameters.

Purpose:

  • To investigate the specific mechanisms by which hyperthyroidism alters calcium-phosphorus metabolism.
  • To compare metabolic parameters between hyperthyroid patients and healthy controls.
  • To assess changes in these parameters upon achieving euthyroidism.

Summary:

  • Hyperthyroid patients exhibited elevated serum calcium, phosphorus, alkaline phosphatase, and urinary hydroxyproline compared to controls.
  • Osteocalcin levels were significantly increased and correlated with thyroid hormone levels, indicating heightened bone turnover.

Related Experiment Videos

  • Intestinal calcium absorption was reduced, and while parathormone and 25-hydroxycholecalciferol levels were unchanged initially, they increased upon returning to euthyroidism.

    • Impact:

    • Identifies dual mechanisms contributing to negative calcium balance in hyperthyroidism: hypercalciuria due to suppressed parathormone and decreased intestinal calcium absorption linked to reduced 1,25-dihydroxycholecalciferol.
    • Highlights osteocalcin as a reliable marker for bone remodeling in hyperthyroidism.
    • Provides insights into the reversibility of metabolic disturbances with thyroid hormone normalization.