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Visual evoked potentials in the horse

Overview of attention for article published in BMC Veterinary Research, June 2016
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Title
Visual evoked potentials in the horse
Published in
BMC Veterinary Research, June 2016
DOI 10.1186/s12917-016-0743-3
Pubmed ID
Authors

L. Ström, B. Ekesten

Abstract

Electrical potentials generated in the central nervous system in response to brief visual stimuli, flash visual evoked potentials (FVEPs), can be recorded non-invasively over the occipital cortex. FVEPs are used clinically in human medicine and also experimentally in a number of animal species, but the method has not yet been evaluated in the horse. The method would potentially allow the ophthalmologist and equine clinician to evaluate visual impairment caused by disorders affecting post-retinal visual pathways. The aim was to establish a method for recording of FVEPs in horses in a clinical setting and to evaluate the waveform morphology in the normal horse. Ten horses were sedated with a continuous detomidine infusion. Responses were recorded from electrodes placed on the scalp. Several positions were evaluated to determine suitable electrode placement. Flash electroretinograms (FERGs) were recorded simultaneously. To evaluate potential contamination of the FVEP from retinal potentials, a retrobulbar nerve block was performed in two horses and transection of the optic nerve was performed in one horse as a terminal procedure. A series of positive (P) and negative (N) peaks in response to light stimuli was recorded in all horses. Reproducible wavelets with mean times-to-peaks of 26 (N1), 55 (P2), 141 (N2) and 216 ms (P4) were seen in all horses in all recordings. Reproducible results were obtained when the active electrode was placed in the midline rostral to the nuchal crest. Recording at lateral positions gave more variable results, possibly due to ear muscle artifacts. Averaging ≥100 responses reduced the impact of noise and artifacts. FVEPs were reproducible in the same horse during the same recording session and between sessions, but were more variable between horses. Retrobulbar nerve block caused a transient loss of the VEP whereas transection of the optic nerve caused an irreversible loss. We describe the waveform of the equine FVEP and our results show that it is possible to record FVEPs in sedated horses in a clinical setting. The potentials recorded were shown to be of post-retinal origin. Further studies are needed to provide normative data and assess potential clinical use.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 29 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 29 100%

Demographic breakdown

Readers by professional status Count As %
Student > Postgraduate 5 17%
Student > Doctoral Student 4 14%
Other 4 14%
Student > Ph. D. Student 4 14%
Researcher 3 10%
Other 5 17%
Unknown 4 14%
Readers by discipline Count As %
Veterinary Science and Veterinary Medicine 14 48%
Medicine and Dentistry 4 14%
Neuroscience 2 7%
Psychology 1 3%
Agricultural and Biological Sciences 1 3%
Other 0 0%
Unknown 7 24%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 21 June 2016.
All research outputs
#7,449,392
of 8,607,055 outputs
Outputs from BMC Veterinary Research
#1,054
of 1,304 outputs
Outputs of similar age
#221,600
of 267,938 outputs
Outputs of similar age from BMC Veterinary Research
#60
of 71 outputs
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