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Related Experiment Video

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Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats
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Visual evoked potentials in the horse.

L Ström1, B Ekesten2

  • 1Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, SE-750 07, Uppsala, Sweden. lena.strom@slu.se.

BMC Veterinary Research
|June 23, 2016
PubMed
Summary

This study successfully recorded flash visual evoked potentials (FVEPs) in sedated horses, establishing a new clinical method for assessing post-retinal visual pathways. The equine FVEP waveform was characterized, showing potential for diagnosing visual impairments.

Keywords:
EquineFVEPFlash visual evoked potentialsHorseVEPVisual cortical evoked potentialsVisual evoked potentialsVisual impairment

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Area of Science:

  • Veterinary Ophthalmology
  • Neuroscience
  • Electrodiagnostics

Background:

  • Flash visual evoked potentials (FVEPs) are non-invasive recordings of central nervous system electrical activity in response to visual stimuli.
  • While used in human medicine and other animal species, FVEP recording methods have not been established in horses.
  • This technique could aid in evaluating visual impairment linked to post-retinal pathway disorders in equine patients.

Purpose of the Study:

  • To develop and validate a clinical method for recording FVEPs in horses.
  • To characterize the waveform morphology of FVEPs in normal, sedated horses.

Main Methods:

  • Ten horses were sedated with detomidine, and scalp electrodes were used for recording.
  • Optimal electrode placement was determined by evaluating various scalp positions.
  • Flash electroretinograms (FERGs) were recorded concurrently, with nerve blocks and optic nerve transection used to confirm the origin of potentials.

Main Results:

  • Consistent and reproducible FVEP waveforms (N1, P2, N2, P4 peaks) were recorded in all horses.
  • Midline electrode placement rostral to the nuchal crest yielded the most reliable results.
  • Optic nerve transection resulted in irreversible FVEP loss, confirming post-retinal origin.

Conclusions:

  • A reliable method for recording FVEPs in sedated horses within a clinical setting has been established.
  • The recorded potentials were confirmed to originate from post-retinal pathways.
  • Further research is required to establish normative data and explore clinical applications for equine visual assessment.