Peaks of brainstem auditory evoked potentials in dogs |
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Authors: | Y Kawasaki S Inada |
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Institution: | (1) Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, 890 Kagoshima, Japan |
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Abstract: | The effects of electrode configuration and click polarity on brainstem auditory evoked potentials (BAEP) in dogs were investigated to clarify the inconsistent nomenclature for each peak. Four positive peaks (waves 1, 2, 3 and 4) before a deep negative trough and a fifth positive peak (wave 5) following the trough were the basic components of BAEP in dogs, which were easily identified regardless of recording conditions such as electrode configuration and click polarity. Additional peaks tended to be present when a noncephalic reference electrode and/or single-polarity (rarefaction or condensation) click stimuli were used. The Roman nomenclature for the individual positive peaks of BAEP in dogs is confused owing to variations in the observed waveforms among researchers, but click polarity and/or reference electrode position can explain all the previously reported variations in BAEP waveforms in dogs. When the criteria concerning wave V in the guidelines of BAEP in human beings are applied to avoid further confusion of Roman nomenclature in dogs, it is recommended that the basic five positive peaks (waves 1, 2, 3, 4 and 5 as identified easily with Ai-Vertex configuration and alternating clicks) are designated as waves I, II, III, V and VI, respectively. Wave IV (wave 3b) occurs occasionally before wave V in dogs.Abbreviations BAEP
brainstem auditory evoked potentials
- dBHL
dB hearing level
- IPL
interpeak latency
- Ai
the caudodorsal end of the zygomatic arch ipsilateral to the stimulated ear
- Nape
the neck over the spinous process of the fourth cervical vertebra |
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Keywords: | acoustic stimulation brainstem potentials click polarity dogs electrode configuration nomenclature |
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