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Primary hypoparathyroidism in two horses.

N P Hudson1, D B Church, J Trevena

  • 1Department of Veterinary Clinical Sciences, University of Sydney, Camden, New South Wales.

Australian Veterinary Journal
|September 24, 1999
PubMed
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Two horses with primary hypoparathyroidism experienced severe hypocalcemia. Treatment with calcium, magnesium, and vitamin D analogues led to full recovery, highlighting effective management for this rare equine condition.

Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Equine Health

Background:

  • Primary hypoparathyroidism is a rare endocrine disorder characterized by insufficient parathyroid hormone production.
  • This condition leads to hypocalcemia (low blood calcium) and hyperphosphatemia (high blood phosphate).
  • Clinical signs in horses can be severe and include neurological and muscular abnormalities.

Observation:

  • Two Thoroughbred horses presented with clinical signs including sweating, agitation, muscle twitching, and synchronous diaphragmatic flutter.
  • These signs were correlated with profound hypocalcemia.
  • Diagnostic evaluation revealed low serum ionized calcium, hyperphosphatemia, and markedly reduced serum immunoreactive parathyroid hormone concentrations with normal renal function.

Findings:

Related Experiment Videos

  • A diagnosis of primary hypoparathyroidism was confirmed in both horses.
  • Treatment involved intravenous and oral calcium, magnesium, and a vitamin D analogue (dihydrotachysterol).
  • Complete remission of clinical signs was achieved within 65 days of treatment.

    • Implications:

    • This case study demonstrates the successful treatment of primary hypoparathyroidism in horses using a combination of supplements and vitamin D analogues.
    • The findings suggest that prompt diagnosis and aggressive management can lead to full recovery and return to athletic function in affected horses.
    • Necropsy in one horse confirmed the absence of parathyroid tissue, supporting the diagnosis of primary hypoparathyroidism.