BAER; Brainstem auditory evoked potentials; Equine neonatology; Animals; Central Nervous System Diseases/diagnosis; Central Nervous System Diseases/veterinary; Evoked Potentials, Auditory, Brain Stem/physiology; Horse Diseases/diagnosis; Horses; Reference Values; Aging; Central Nervous System Diseases; Evoked Potentials, Auditory, Brain Stem; Horse Diseases; Veterinary (all); General Veterinary
Abstract :
[en] BACKGROUND: Age and rate of acoustic stimulation affect peak latencies in brainstem auditory evoked responses (BAER) in humans. Those effects are unknown in foals.
HYPOTHESIS/OBJECTIVES: Our goals were to (1) establish reference values for BAER in foals by using 3 different stimulation protocols, (2) evaluate the effects of age and stimulation frequencies on BAER tracing in foals up to 6 months old, and (3) compare the data with BAER obtained from foals with central nervous system (CNS) disorders.
ANIMALS: Thirty-nine neurologically normal foals and 16 foals with neurologic diseases.
METHODS: Prospective observational clinical study. BAER recorded by using 3 protocols of stimulation (11.33 repetitions per second [Hz]/70 decibel normal hearing level [dBNHL]; 11.33 Hz/90 dBNHL; 90 Hz/70 dBNHL).
RESULTS: No effect of age was observed in normal foals (P > .005). No significant difference was observed for latencies and interpeak latencies (IPL) when comparing foals with neurologic diseases and normal foals (P > .05), but 78.6% of foals with neurologic diseases had an asymmetry in their tracing, reflecting a difference in conduction time between the left and right side of the brainstem. Increasing the stimulation rate did not improve detection of CNS disorders.
CONCLUSIONS AND CLINICAL IMPORTANCE: We propose BAER reference values for foals up to 6 months of age by using 3 protocols. Most foals with neurologic deficits had abnormal BAER tracing.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Lecoq, Laureline ; Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés (DCA) > Médecine interne des équidés ; Département de Sciences Cliniques, Université de Montréal, Saint-Hyacinthe, QC, Canada
Gains, M; Département de Pathologie, Université de Montréal, Saint-Hyacinthe, Canada
Blond, L; Département de Sciences Cliniques, Université de Montréal, Saint-Hyacinthe, Canada
Parent, J; Département de Sciences Cliniques, Université de Montréal, Saint-Hyacinthe, Canada
Language :
English
Title :
Brainstem auditory evoked responses in foals: reference values, effect of age, rate of acoustic stimulation, and neurologic deficits.
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