Equine laminitis: its development coincides with increased sublamellar blood flow.
Authors: Pollitt, Davies
Journal: Equine veterinary journal. Supplement
Summary
# Editorial Summary Pollitt and Davies investigated the vascular events preceding laminitis onset by monitoring digital blood flow changes in horses subjected to acute carbohydrate overload. Using continuous hoof temperature logging as a non-invasive proxy for sublamellar blood flow in 21 Standardbred horses maintained in a cold environment (10°C), they identified a critical 16–40 hour window following nasogastric administration of ground wheat flour (17.5 g/kg body weight) during which laminitis-affected horses exhibited sustained digital vasodilation, whilst control and laminitis-negative animals maintained normal vasoconstriction. Between 12 and 32 hours post-overload, hoof surface temperature proved the only parameter significantly differentiating laminitis-positive from laminitis-negative horses (P < 0.05), suggesting that prolonged sublamellar vasodilation concurrent with severe metabolic derangement may expose lamellar tissues to pathogenic circulating factors capable of triggering tissue separation. This work fundamentally reframes laminitis pathogenesis as a vascular phenomenon rather than purely metabolic, with direct implications for therapeutic timing—interventions aimed at maintaining digital vasoconstriction or limiting blood flow during the critical 12–40 hour window may prevent lamellar injury regardless of the initial metabolic insult. The findings highlight why early recognition of digital heat and careful thermal monitoring could become valuable clinical tools for early intervention in at-risk individuals.
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Practical Takeaways
- •Monitor hoof temperature as a non-invasive indicator of digital blood flow changes; elevated hoof temperatures 16-40 hours after grain overload may signal laminitis risk
- •Strict dietary management to prevent carbohydrate overload is critical, as the metabolic crisis combined with vasodilation creates conditions for lamellar damage
- •If carbohydrate overload occurs, supporting digital vasoconstriction (through cooling protocols or other means) during the critical 12-40 hour window may help prevent laminitis development
Key Findings
- •Horses that developed laminitis experienced prolonged digital vasodilation 16-40 hours after carbohydrate overload, whereas laminitis-negative horses did not
- •Hoof temperature was significantly higher in laminitis-positive horses between 12-32 hours post-carbohydrate overload (P < 0.05), and was the only parameter that differentiated the two groups
- •Sustained digital vasoconstriction during the 12-40 hour post-overload period prevented laminitis development
- •Sublamellar vasodilation concurrent with metabolic crisis from carbohydrate overload may expose lamellar tissues to blood-borne factors triggering lamellar separation