horse nerve blocks

Nerve blocks can be invaluable diagnostic tools for veterinarians working on equine lameness cases. By injecting anesthetics to numb a specific spot, they can often localize the painful area and prescribe appropriate treatment.

However, previous research has shown that, after injection, the anesthetics can seep away from the injection site and numb more of the area—and potentially more internal structures—than intended. This can result in a less precise diagnosis because a larger area than expected is desensitized, said Stine Jacobsen, DVM, PhD, Dipl. ECVS, a professor at the University of Copenhagen Faculty of Health and Medical Sciences, in Denmark.

The good news is Jacobsen and colleagues recently found a way to keep the anesthetic closer to where the practitioner wants it: Applying a compression bandage before injections can help prevent anesthetic diffusion during palmar digital nerve blocks, which veterinarians use to numb the hoof’s internal structures.

The researchers applied a compression bandage to the pastern region before injecting a radiodense drug as they would a nerve block. The radiodense material allowed them to follow the substance’s movement inside the horse’s leg using radiographs.

When a simple compression bandage was applied before the initial injection, radiographs showed that the drugs remained localized rather than spreading further up into the leg, Stine said.

Jacobsen said this study’s focus was to establish the technique of using compression bandages during nerve block procedures. She noted that additional research is needed to investigate if compression bandages can lead to better nerve block results. If so, she said, compression bandage use could lead to more precise diagnoses, which is the prerequisite for effective treatment.

The study, “The effect of a compression bandage on the distribution of radiodense contrast medium after palmar digital nerve blocks,” was published in the Equine Veterinary Journal.

About The Author

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Katie Navarra has worked as a freelance writer since 2001. A lifelong horse lover, she owns and enjoys competing a dun Quarter Horse mare.