Equine laminitis: Induced by 48 h hyperinsulinaemia in Standardbred horses

de Laat, M. A., McGowan, C. M., Sillence, M. N. and Pollitt, C. C. (2010) Equine laminitis: Induced by 48 h hyperinsulinaemia in Standardbred horses. Equine Veterinary Journal, 42 2: 129-135. doi:10.2746/042516409X475779


Author de Laat, M. A.
McGowan, C. M.
Sillence, M. N.
Pollitt, C. C.
Title Equine laminitis: Induced by 48 h hyperinsulinaemia in Standardbred horses
Journal name Equine Veterinary Journal   Check publisher's open access policy
ISSN 0425-1644
2042-3306
Publication date 2010-03
Sub-type Article (original research)
DOI 10.2746/042516409X475779
Volume 42
Issue 2
Start page 129
End page 135
Total pages 7
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2011
Language eng
Formatted abstract
Reasons for performing study: Hyperinsulinaemia is known to induce laminitis experimentally in healthy ponies with no history of the condition. Horses are more insulin sensitive than ponies and whether prolonged hyperinsulinaemia and euglycaemia would have a similar laminitogenic effect requires study.
Objectives: To determine if laminitis results when the prolonged euglycaemic hyperinsulinaemic clamp technique (p-EHC) is applied to clinically normal Standardbred horses, and to monitor hoof wall temperature seeking an association between vascular activity and laminitis development.
Methods: Eight young, clinically normal Standardbred horses were assigned into 4 pairs and within each pair, one was assigned randomly to either treatment (n = 4) or control (n = 4) groups. Treated horses received continuous infusions of insulin and glucose until clinical signs of laminitis developed, at which point the horses were subjected to euthanasia. Control horses received an equivalent volume of a balanced electrolyte infusion for the same period. Hoof wall surface temperature (HWST) was monitored continuously throughout the experimental period.
Results: All horses in the treatment group were calculated to have normal insulin sensitivity. All treated horses, and none in the control group, developed laminitis (P = 0.01). Pronounced digital pulses were a feature of the treatment group, while insignificant digital pulses occurred in control horses. HWST was higher and less variable in treated horses once hyperinsulinaemia was established.
Conclusions: Healthy Standardbred horses subjected to prolonged hyperinsulinaemia develop laminitis within 48 h, demonstrating that laminitis in horses can be triggered by insulin.
Potential relevance: Insulin resistance and the associated hyperinsulinaemia place horses and ponies at risk of developing laminitis. This study demonstrates a need for prompt management of the persistent hyperinsulinaemia seen in some endocrinopathies.
© 2009 EVJ Ltd.
Keyword Horse
Insulin
Equine
Laminitis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Australian Equine Genetics Research Centre Publications
 
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Created: Sun, 21 Feb 2010, 00:08:25 EST