Brainstem Auditory Evoked Responses in an Equine Patient Population. Part II: Foals

M. Aleman, J. E. Madigan, D. C. Williams, T. A. Holliday

Research output: Contribution to journalArticle

Abstract

Background: Reports of the use of brainstem auditory evoked response (BAER) as a diagnostic modality in foals have been limited. Hypothesis/Objectives: To describe BAER findings and associated causes of hearing loss in foals. Animals: Study group 18 foals (15 neonatal, 3 nonneonatal), control group (5 neonatal foals). Methods: Retrospective. BAER records from the Clinical Neurophysiology Laboratory were reviewed from the years of 1982 to 2013. Peak latencies, amplitudes, and interpeak intervals were measured when visible. Clinical data were extracted from the medical records. Foals were grouped under disease categories. Descriptive statistics were performed. Results: Ten neonatal foals had complete absence of BAER bilaterally and 5 had findings within reference range. Abnormalities were associated with common neonatal disorders such as sepsis, neonatal encephalopathy, neonatal isoerythrolysis, and prematurity. BAER loss also was observed in foals with specific coat color patterns such as completely or mostly white with blue irides or lavender with pale yellow irides. An American Miniature foal with marked facial deformation also lacked BAER bilaterally. One nonneonatal foal with an intracranial abscess had no detectable BAER peaks bilaterally, and 2 older foals, 1 with presumed equine protozoal myeloencephalitis and the other with progressive scoliosis and ataxia, had BAER within normal limits. Conclusions and Clinical Importance: In neonatal foals, BAER deficits commonly are complete and bilateral, and associated with common neonatal disorders and certain coat and eye color patterns. Sepsis, hypoxia, bilirubin toxicity, and prematurity should be investigated as potential causes of auditory loss in neonatal foals.

Original languageEnglish (US)
Pages (from-to)1318-1324
Number of pages7
JournalJournal of Veterinary Internal Medicine
Volume28
Issue number4
DOIs
StatePublished - 2014

Fingerprint

Brain Stem Auditory Evoked Potentials
brain stem
foals
Horses
horses
Population
Iris
iris (eyes)
premature birth
Lavandula
Eye Color
Encephalomyelitis
Neurophysiology
Brain Diseases
Scoliosis
equine protozoal myeloencephalitis
Ataxia
scoliosis
Hearing Loss
Bilirubin

Keywords

  • Deafness
  • Electrophysiology
  • Equine
  • Hearing

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Brainstem Auditory Evoked Responses in an Equine Patient Population. Part II : Foals. / Aleman, M.; Madigan, J. E.; Williams, D. C.; Holliday, T. A.

In: Journal of Veterinary Internal Medicine, Vol. 28, No. 4, 2014, p. 1318-1324.

Research output: Contribution to journalArticle

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