Neuromyotonia in a horse

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Zakia, Luiza Stachewski [UNESP]
Palumbo, Mariana Isa Pocci
Teixeira, Raffaella Bertoni Cavalcanti
Resende, Luiz Antônio Lima [UNESP]
Soares, Mauro Pereira
de Oliveira-Filho, José Paes [UNESP]
Amorim, Rogério Martins [UNESP]
Borges, Alexandre Secorun [UNESP]

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This article describes the clinical and electromyographic findings of neuromyotonia in a 19-month-old male crossbred Quarter Horse that presented with stiffness and muscle asymmetry in the hind limbs as well as sacrococcygeal, paravertebral, and gluteal myokymia. An electromyographic study showed spontaneous continuous muscle fiber activity with high-frequency discharges, fibrillations, positive sharp waves, fasciculation potentials, and complex repetitive discharges. Histological examination of the gluteal muscle showed a mixed neurogenic and myopathic pattern. The findings are consistent with neuromyotonia.



electromyography, equine, myokymia, myopathy, stiffness

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Journal of Veterinary Internal Medicine, v. 33, n. 1, p. 287-291, 2019.