ISSN 2398-2977      

Electrodiagnostic testing

pequis

Synonym(s): Electromyography EMG, electroencephalography EEG, auditory brainstem testing ABR


Introduction

  • The changes in cell electrical activity which occur during neurologic disease can be measured using specialist electronic equipment.
  • Such measurements can be useful in localizing, diagnosing and prognosing neurologic disease.
  • The techniques should be used as an extension of the neurological examination   Neurology: examination - adult    Neurology: examination - foal  and other diagnostic procedures, eg cerebrospinal fluid (CSF) evaluation   CSF: collection  , radiography   Head: radiography    Spine: radiography  , ultrasound   Ultrasonography: overview  , to provide a more complete picture of the disease process and assist in obtaining a distinct diagnosis. 
  • Because of recent advances made in magnetic resonance imaging (MRI)   Magnetic resonance imaging  , scintigraphy   Brain: scintigraphy  and computed tomography (CT)   Computed tomography  electrodiagnostic testing is used less frequently today. 
  • It is far more common to perform an MRI on horses with CNS disease.
  • techniques include:
    • Electromyography (EMG)useful for defining diseases of: 
      • Lower motor neuron.
      • Motor unit:
        • Nerve cell body.
        • Myoneural junction.
        • Muscle fibers.
    • Nerve conduction studiesuseful for defining diseases of: 
      • Lower motor neuron.
      • Motor unit.
    • Auditory brainstem response (ABR)useful for defining diseases of:
      • Cranial nerve VIII.
      • Auditory pathways through the brainstem.
    • Electroencephalography (EEG)useful for defining: 
      • Focal and diffuse intracranial lesions.

Advantages

Disadvantages

  • Expensive equipment required.
  • High degree of specialist expertise required to perform procedures and interpret results.

Electromyography (EMG)

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Nerve conduction studies

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Auditory brainstem evoked response (ABR testing)

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Electroencephalography (EEG)

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Other

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Further Reading

Publications

Refereed papers

Other sources of information

  • Andrews F M (2004) Electrodiagnostic Aids and Selected Neurologic diseases. In: Equine Internal Medicine. Eds: Reed S M, Bayly W M & Sellon D C. Saunders, USA. pp 546-560. ISBN: 0721697771.
  • Byrne B A (1992) Nervous System Diagnostic Procedures. In: Equine Surgery. Eds: Auer J A & Stick J A. W B Saunders, USA. pp 412-423. ISBN: 0721677339.

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