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Equine degenerative myeloencephalopathy

M M Miller¹, C Collatos

¹New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, USA.

The Veterinary Clinics of North America. Equine Practice

|April 1, 1997

Summary

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Equine degenerative myeloencephalopathy (EDM) is a progressive neurologic disease in young horses. While vitamin E supplementation may help, complete recovery is unlikely due to its hereditary and degenerative nature.

Area of Science:

Veterinary Neurology
Equine Medicine
Animal Pathology

Background:

Equine degenerative myeloencephalopathy (EDM) is a neurologic condition affecting young horses.
Characterized by insidious, symmetric ataxia, EDM diagnosis is supported by clinical signs like diminished reflexes and predisposing factors.
Key suspected causes include vitamin E deficiency and genetic predisposition.

Purpose of the Study:

To outline the clinical presentation and pathogenesis of Equine degenerative myeloencephalopathy.
To discuss diagnostic indicators and histopathological findings associated with EDM.
To recommend management strategies for affected horses.

Main Methods:

Clinical case observation and review of diagnostic signs.
Analysis of predisposing factors including genetics and environmental exposures.

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Histopathological examination of affected nervous tissue.

Evaluation of treatment outcomes with alpha-tocopherol acetate supplementation.

Main Results:

Clinical signs include symmetric ataxia and reduced cutaneous trunci reflex.
Neuraxonal dystrophy is the characteristic histopathological finding.
Long-term alpha-tocopherol acetate treatment may show some improvement, but prognosis is generally poor.

Conclusions:

EDM is a significant neurologic disease in horses with poor recovery prognosis.
Vitamin E deficiency and hereditary factors are crucial in EDM pathogenesis.
Early diagnosis and supplementation are recommended, though complete recovery is rare.