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Equine laminitis--another hypothesis for pathogenesis.

J R Field1, L B Jeffcott

  • 1Department of Veterinary Clinical Sciences, University of Melbourne Veterinary Clinical Centre, Werribee, Victoria, Australia.

Medical Hypotheses
|November 1, 1989
PubMed
Summary
This summary is machine-generated.

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Fat ponies and those with a history of laminitis show insulin insensitivity. This impaired insulin response contributes to the development of laminitis in horses and ponies.

Area of Science:

  • Equine health
  • Metabolic disorders
  • Veterinary medicine

Background:

  • Laminitis is a serious equine condition with a poor prognosis and high recurrence rate, particularly in ponies.
  • Multiple etiological factors contribute to laminitis, with obesity and prior laminitis episodes being significant risk factors.

Purpose of the Study:

  • To investigate the role of insulin insensitivity in the pathogenesis of laminitis in ponies.
  • To compare glucose and insulin responses in fat and laminitic ponies versus normal ponies and horses.

Main Methods:

  • Oral glucose loading (1 g/kg body weight) and intravenous insulin response tests (0.4 IU/kg body weight) were administered to different pony and horse groups.
  • Plasma insulin levels were monitored after glucose loading to assess glucose tolerance and insulin response.

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Main Results:

  • Fat and previously laminitic ponies demonstrated significantly lower tolerance to oral glucose loading compared to normal ponies and horses.
  • These ponies exhibited exaggerated plasma insulin level responses to glucose loading, indicating impaired insulin sensitivity.
  • Insulin response tests revealed minimal and prolonged insulin responses in fat and laminitic ponies, confirming innate insulin insensitivity.

Conclusions:

  • The study establishes a link between insulin insensitivity and laminitis in ponies.
  • Reduced insulin effectiveness may lead to elevated thromboxane A2 activity, causing peripheral vasoconstriction and compromising blood flow to the foot, thus contributing to laminitis development.