MSD Manual

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Differential Diagnoses of Equine Myopathies

Differential Diagnoses of Equine Myopathies

Myopathy Type

Differential Diagnoses

Non-exercise-associated Rhabdomyolysis

Inflammatory

Influenza myositis

Immune-mediated myositis

Toxic

Ionophore toxicity

Senna occidentalis

Rayless goldenrod/white snakeroot

Hypoglycin A in box elder and European sycamore trees

Traumatic

Compressive anesthetic myopathy

Trauma

Genetic

Myosin heavy chain myopathy (Quarter Horse-related breeds)

Exertional Rhabdomyolysis

Focal muscle strain

Overexertion, dietary imbalances, vitamins, minerals, electrolytes

Idiopathic chronic exertional rhabdomyolysis

Exertional Myopathy with Normal CK activity

Myofibrillar myopathy

Muscle Atrophy

Myogenic atrophy

Severe rhabdomyolysis

Disuse

Vitamin E–responsive myopathy

Myofibrillar myopathy

Neurogenic atrophy

Equine protozoal myelitis

Local nerve trauma

Idiopathic peripheral neuropathy

Toxic peripheral neuropathies

Muscle Fasciculations

Pain, fear

Electrolyte abnormalities

Hypokalemia

Otobius megnini (ear tick) infestation

Stiff horse syndrome