Brainstem auditory evoked potentials in horses

Abstract

The brainstem auditory evoked potential (BAEP) evaluates the integrity of the auditory pathways to the brainstem. The aim of this study was to evoke BAEPs in (I, II, III, IV, and V) and interpeaks (I-III, III-V, and I-V) were identified. The mean latencies of the waves were as follows: wave I, 2.4 ms; wave II, 2.24 ms; wave III, 3.61ms; wave IV, 4.61ms; and wave V, 5.49ms. The mean latencies of the interpeaks were as follows: I-III, 1.37ms; 1.88ms; 3.26ms. This is the first study using BAEPs in horses in Brazil, and the observed latencies will be used as normative data for the interpretation of tests performed on horses with changes related to auditory system or neurologic abnormalities. ondas foram: onda I 2,24ms; onda II 2,74ms; onda III 3,61ms; onda IV 4,61ms; e onda V 5,49ms Key words: horses, interpeaks, latency, deafness. RESUMO O Potencial Evocado Auditivo de Tronco Encefálico (BAEP-Brainstem Auditory Evoked Potential) avalia a integridade das vias auditivas até o tronco encefálico. O objetivo da pesquisa foi padronizar o uso do BAEP em 21 equinos, sem aparente anormalidade auditiva. Os animais foram sedados com cloridrato de detomidina (0,013mg.kg -1 de PV). Foram utilizados fones de inserção,cliques de rarefação a 90 dB e um ruído de mascaramento de 40 dB. Foram identificadas as latências das ondas I, II, III, IV e V e dos interpicos I-III, III-V e I-V. As médias das latências das