May 10, 2008

Qualitative and quantitative characteristics of the electroencephalogram in normal horses during spontaneous drowsiness and sleep

Journal of Veterinary Internal Medicine
D C WilliamsR A Lecouteur

Abstract

The influence of sleep on the equine electroencephalogram (EEG) has not been well documented. The objectives were to develop a noninvasive method of electrode placement for recording the EEG in horses and to establish normal EEG parameters for the various states of vigilance. Findings are compared with previously published reports on equine sleep based on electrocorticography (ECoG). Five neurologically normal horses. Overnight EEGs were recorded digitally in association with simultaneous videotaping of the horses' behavior. Data were analyzed by visual inspection, states of vigilance were identified, and representative segments were quantitatively processed. Transient EEG events were examined. Slow wave sleep (SWS) was significantly different (P < .05) in frequency and power from drowsiness and rapid eye movement (REM) sleep. Second-degree heart block was associated with SWS as were transient events commonly recognized in EEGs of humans. Drowsiness and REM sleep were similar. In both, background activity was low-amplitude beta activity admixed with prominent activity of approximately 4 Hz. Standing REM sleep was associated with numerous partial collapses in 1 horse. Normative data for several states were described and probable...Continue Reading

  • References10
  • Citations17

Mentioned in this Paper

Heart Block
Electroencephalography
Slow Virus Diseases
Sleep, Slow-Wave
Genus equus
Sleep Stages
Equus caballus
Sedatives
Sleep, REM
Specimen Type - Electrode

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