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Home / Equine Research Bank / J Vet Intern Med / Neurologic Deficits Including Auditory Loss and Recovery of ...
Journal of veterinary internal medicine2015; 30(1); 282-288; doi: 10.1111/jvim.13654

Neurologic Deficits Including Auditory Loss and Recovery of Function in Horses with Temporohyoid Osteoarthropathy.

Abstract: Auditory loss is a common deficit in horses with temporohyoid osteoarthropathy (THO), however, recovery of function is unknown. Objective: To investigate neurologic function with emphasis in audition in horses with THO after treatment. To describe anatomical alterations of the petrous temporal bone that might result in auditory loss. Methods: Twenty-four horses with a clinical diagnosis of THO. Methods: Prospective study. A brainstem auditory evoked response (BAER) study was done as part of the criteria for inclusion in horses with a clinical diagnosis of THO from the years of 2005 to 2014. Physical and neurologic status and BAER findings were recorded. Brainstem auditory evoked response variables were compared by using Wilcoxon sign test. Fisher's exact test was also used. Significance was set at P < 0.05. Results: The most common signs included auditory loss (100% of horses), vestibular and facial nerve dysfunction (83%), and exposure ulcerative keratitis (71%). Concurrent left laryngeal hemiparesis was observed in 61% of horses through endoscopy. Auditory dysfunction was bilateral in 50% of the cases (complete and partial), and unilateral affecting more commonly the right ear (R = 8, L = 4). Short- and long-term follow-up revealed persistent auditory loss in all horses based on abnormal response to sound, and further confirmed through a BAER in 8 horses. Conclusions: Auditory dysfunction appears to be a permanent neurologic deficit in horses diagnosed with THO despite overall neurologic improvement.
Copyright © 2015 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.
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Publication Date: 2015-10-29 PubMed ID: 26513722PubMed Central: PMC4913646DOI: 10.1111/jvim.13654Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research investigates the level of auditory loss in horses diagnosed with Temporohyoid Osteoarthropathy (THO), and whether this function recovers post-treatment. It also explores the anatomical changes in the petrous temporal bone that could cause audio loss.

Objectives and Methods

  • The goal of the study was to examine neurological function in horses, with a focus on hearing ability, who have been diagnosed with THO and have undergone treatment. They also aimed to outline any changes in the petrous temporal bone—an area of the skull near the ear—that might contribute to hearing loss.
  • The study consisted of twenty-four horses that had been clinically diagnosed with THO. To make this diagnosis, a brainstem auditory evoked response (BAER) test was performed. This test measures the brain’s response to auditory stimuli and can indicate issues with hearing and auditory nerves.
  • The researchers carried out a prospective study which spanned from 2005 to 2014. In addition to the BAER test, physical and neurological status were recorded and evaluated.
  • Data from the BAER tests were statistically analyzed using the Wilcoxon sign test and Fisher’s exact test, with the significance level set at P<0.05.

Results

  • The most frequently diagnosed conditions included hearing loss (all horses were affected), vestibular and facial nerve dysfunction (83%) and exposure ulcerative keratitis (71%).
  • Concurrent left laryngeal hemiparesis, a condition which affects the horse’s ability to swallow, was seen in 61% of the horses, as determined by endoscopy.
  • The hearing loss was found to be bilateral—or affecting both ears—in half the cases. When only one ear was affected, it was more commonly the right ear.
  • Despite following up both in the short and long term, permanent hearing loss was confirmed through abnormal responses to sound testing, and additional BAER tests in 8 horses.

Conclusions

  • The study concluded that despite overall neurological improvement, hearing loss appears to be a permanent issue for horses diagnosed with Temporohyoid Osteoarthropathy.

Cite This Article

APA
Aleman M, Spriet M, Williams DC, Nieto JE. (2015). Neurologic Deficits Including Auditory Loss and Recovery of Function in Horses with Temporohyoid Osteoarthropathy. J Vet Intern Med, 30(1), 282-288. https://doi.org/10.1111/jvim.13654

Publication

Journal of veterinary internal medicine
ISSN: 1939-1676
NlmUniqueID: 8708660
Country: United States
Language: English
Volume: 30
Issue: 1
Pages: 282-288

Researcher Affiliations

Aleman, M
  • Department of Medicine and Epidemiology, University of California, Davis, CA.
Spriet, M
  • Department of Surgical and Radiological Sciences, University of California, Davis, CA.
Williams, D C
  • William R. Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA.
Nieto, J E
  • Department of Surgical and Radiological Sciences, University of California, Davis, CA.

MeSH Terms

  • Animals
  • Evoked Potentials, Auditory, Brain Stem / physiology
  • Female
  • Hearing Loss
  • Horse Diseases / etiology
  • Horses
  • Male
  • Nervous System Diseases / etiology
  • Nervous System Diseases / veterinary
  • Osteoarthritis / complications
  • Osteoarthritis / veterinary
  • Prospective Studies

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