Equine laminitis: cryotherapy reduces the severity of the acute lesion.

The research explores the use of cryotherapy, inducing a hypometabolic and vasoconstrictive state, to prevent laminitis (a painful condition in horses) caused by dietary carbohydrate overload. The results indicate that cryotherapy can significantly reduce the severity of acute laminitis.

Objective and Methodology

The ultimate goal of this research lies in the application of distal limb cryotherapy, a cold therapy technique, to prevent laminitis brought on by an overload of carbohydrates in a horse’s diet. The research tested this theory on 6 Standardbred horses. This breed was chosen due to its historical exposure to the condition, each of which had one of their front limbs continuously cooled using a mixture of ice and water. To evaluate the severity and effects of the cryotherapy, the researchers used:

• Lameness evaluations
• Blinded lamellar histological grading
• Analysis for lamellar matrix metalloproteinase-2 (MMP-2) mRNA expression

Results of the Study

The findings showed that cryotherapy was both well tolerated by the horses and effective at cooling their limbs. More importantly, no lameness was observed in any of the treated limbs. Measurements of laminitis histology scores in the treated limbs were significantly lower than in the corresponding untreated forelimbs. Similarly, scores were also lower than those of other untreated limbs (both fore and hind limbs in entirety, treated as a group). The study also demonstrated that MMP-2 mRNA expression (a component implicated in damaging tissue functionality in laminitis) was significantly lower in the cryotherapy-treated feet than in the untreated ones.

Conclusions and Implications

The study concludes that cryotherapy, when applied accurately and continuously to a horse’s foot, can drastically mitigate the severity of acute laminitis. The researchers propose that the primary therapeutic mechanisms in this treatment are vasoconstriction and hypometabolism. These respectively refer to narrowing of the blood vessels (which helps prevent the delivery of certain trigger factors from the bloodstream) and slowing metabolic activity (which reduces lamellar MMP activity). The study suggests that while additional research is required to confirm these findings, cryotherapy poses a potentially effective preventative strategy for horses at risk of developing acute laminitis.