The role of electromyography in clinical diagnosis of neuromuscular locomotor problems in the horse.
Authors: Wijnberg I D, Back W, de Jong M, Zuidhof M C, van den Belt A J M, van der Kolk J H
Journal: Equine veterinary journal
Summary
# Editorial Summary: EMG's Clinical Value in Equine Neuromuscular Diagnosis Wijnberg and colleagues examined whether needle electromyography (EMG) meaningfully improved diagnostic accuracy in horses presenting with neuromuscular locomotor dysfunction, evaluating 108 equine patients across a range of ages and body types using systematic muscle examination protocols. Clinical diagnosis alone identified myopathy in 20 horses and neuropathy in 58, yet EMG analysis revised these figures to 17 and 82 cases respectively—substantially altering the proportion of neuropathic diagnoses. Beyond disease classification, EMG proved particularly valuable for lesion localisation, revealing cervical pathology (C1-T2) in 27% of cases when EMG was included versus just 7% without it, whilst modifying the anatomical location in 37% of neuropathic and 12% of myopathic cases overall. Notably, when clinical examination alone proved non-diagnostic, EMG identified either localised cervical involvement (29% of these cases) or generalised neuropathy (54%), providing crucial information that would otherwise have remained obscure. For practitioners managing horses with subtle or atypical presentations of neuromuscular disease, these findings underscore that EMG should be considered a complementary rather than confirmatory tool, capable of directing treatment and prognosis by clarifying both disease type and spinal cord segment involvement.
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Practical Takeaways
- •EMG should be part of the diagnostic protocol for horses with suspected neuromuscular problems, as it significantly improves both diagnosis and localization of lesions
- •Cervical spinal lesions are underdiagnosed without EMG; consider EMG when standard clinical examination is inconclusive
- •EMG can identify generalized neuropathy in horses where clinical examination alone yields no diagnosis, potentially changing management and prognosis
Key Findings
- •EMG analysis increased neuropathy diagnosis from 58 to 82 horses (41% increase) and changed myopathy diagnosis from 20 to 17 horses
- •EMG changed anatomical localization in 37% of neuropathy cases and 12% of myopathy cases
- •Cervical lesions (C1-T2) were diagnosed in only 7% without EMG but 27% with EMG, while L3-S3 lesions decreased from 30% to 17%
- •In cases with no initial diagnosis, EMG revealed 29% had localized cervical lesions and 54% had generalized neuropathy