Insulin tolerance in laminitic ponies.
Authors: Coffman, Colles
Journal: Canadian journal of comparative medicine : Revue canadienne de medecine comparee
Summary
# Editorial Summary: Insulin Tolerance in Laminitic Ponies Coffman and Colles investigated whether ponies with a history of chronic laminitis display altered insulin sensitivity, suspecting metabolic dysfunction might underlie their predisposition to recurrent episodes. Using insulin tolerance testing—a standard method of assessing glucose clearance—they measured both blood glucose responses and blood pressure changes in laminitic animals compared to healthy controls. The laminitic ponies demonstrated significantly reduced insulin sensitivity when assessed by glucose clearance, indicating their tissues were responding poorly to insulin signalling; however, they showed an exaggerated hypotensive response, with greater drops in diastolic, systolic and mean arterial pressure following insulin administration. These findings suggest that laminitis-prone ponies exhibit metabolic dysfunction extending beyond glucose regulation to include cardiovascular instability, which practitioners should consider when evaluating risk factors and may help explain why some animals remain susceptible to recurrent episodes despite dietary management. The implications merit further investigation into whether insulin resistance represents a primary cause or consequence of laminitis, and whether targeted management of insulin sensitivity could reduce clinical incidence in predisposed populations.
Read the full abstract on PubMed
Practical Takeaways
- •Insulin insensitivity in laminitic ponies suggests metabolic dysfunction may be involved in laminitis pathogenesis; insulin tolerance testing could help identify at-risk horses
- •The exaggerated blood pressure response to insulin in laminitic ponies indicates possible cardiovascular or autonomic nervous system involvement in the condition
- •Consider metabolic assessment and insulin sensitivity evaluation in horses with chronic or recurrent laminitis to inform management and prevention strategies
Key Findings
- •Laminitic ponies demonstrated significantly reduced sensitivity to insulin compared to control ponies based on blood glucose response
- •Laminitic ponies showed significantly greater post-insulin decline in diastolic, systolic, and mean blood pressure compared to controls
- •Insulin tolerance testing revealed differential metabolic and cardiovascular responses between laminitic and non-laminitic ponies