Brainstem Auditory Evoked Responses in an Equine Patient Population

Part I - Adult Horses

Monica R Aleman, T. A. Holliday, Jorge Nieto, D. C. Williams

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Background: Brainstem auditory evoked response has been an underused diagnostic modality in horses as evidenced by few reports on the subject. Hypothesis/Objectives: To describe BAER findings, common clinical signs, and causes of hearing loss in adult horses. Animals: Study group, 76 horses; control group, 8 horses. 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. Horses were grouped under disease categories. Descriptive statistics and a posthoc Bonferroni test were performed. Results: Fifty-seven of 76 horses had BAER deficits. There was no breed or sex predisposition, with the exception of American Paint horses diagnosed with congenital sensorineural deafness. Eighty-six percent (n = 49/57) of the horses were younger than 16 years of age. The most common causes of BAER abnormalities were temporohyoid osteoarthropathy (THO, n = 20/20; abnormalities/total), congenital sensorineural deafness in Paint horses (17/17), multifocal brain disease (13/16), and otitis media/interna (4/4). Auditory loss was bilateral and unilateral in 74% (n = 42/57) and 26% (n = 15/57) of the horses, respectively. The most common causes of bilateral auditory loss were sensorineural deafness, THO, and multifocal brain disease whereas THO and otitis were the most common causes of unilateral deficits. Conclusions and Clinical Importance: Auditory deficits should be investigated in horses with altered behavior, THO, multifocal brain disease, otitis, and in horses with certain coat and eye color patterns. BAER testing is an objective and noninvasive diagnostic modality to assess auditory function in horses.

Original languageEnglish (US)
Pages (from-to)1310-1317
Number of pages8
JournalJournal of Veterinary Internal Medicine
Volume28
Issue number4
DOIs
StatePublished - 2014

Fingerprint

Brain Stem Auditory Evoked Potentials
brain stem
Horses
horses
Population
deafness
central nervous system diseases
Paint (horse breed)
Brain Diseases
Deafness
Otitis
Paint
Labyrinthitis
Eye Color
otitis media
Neurophysiology
neurophysiology
Otitis Media
hearing
Hearing Loss

Keywords

  • Deafness
  • Electrophysiology
  • Equine
  • Hearing

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Brainstem Auditory Evoked Responses in an Equine Patient Population : Part I - Adult Horses. / Aleman, Monica R; Holliday, T. A.; Nieto, Jorge; Williams, D. C.

In: Journal of Veterinary Internal Medicine, Vol. 28, No. 4, 2014, p. 1310-1317.

Research output: Contribution to journalArticle

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