Mudanças nos parâmetros do clique durante a captação do BERA

Abstract

Mani pulation of auditory stimuli affect the ABR evoked potentials and aid the diagnosis, particularly in auditory neuropathy patients. Some patients with auditory neuropathy lose evoked otoacoustic emissions over time; in these cases, comparing responses to rarefaction and condensation clicks, and decreasing the stimulus rate can show an extended cochlear microphonism or yield an improved electric potential record. Aim: To analyze the effect of these click manipulations on the records of potentials of patients with hearing loss as a form of improving the diagnosis. Study design: A clinical prospective study. Patients and Method: 59 patients with hearing loss underwent ABR recording using rarefaction and condensation clicks at a stimulus rate of 27.7/sec, and rarefaction clicks at a stimulus rate of 3.3/sec. The records were compared to the otoacoustic evoked emission. Results: Eight (13.53%) patients showed changes in the recorded ABR potentials as a result of manipulating the characteristics of clicks, such as extended cochlear microphonism or an improved record of electric potentials. Five patients had no otoacoustic evoked emissions. Conclusion: Manipulation of click stimuli can improve the topographic diagnosis of hearing loss, particularly in the group of auditory neuropathy patients with no otoacoustic evoked emissions, where usually, the diagnosis is only possible through the method described above.

Contribuição do potencial evocado auditivo em pacientes com vertigem

“…The use of higher intensities is useful in order to visualize all the components, in such a way that this could have been increased to higher than 80 dB HL when wave I went missing. The change in click characteristics and on polarity patterns may sensitize the test, helping in the topographic diagnosis of the hearing loss, especially in retrocochlear disorders 27 . Moreover, the fact that the patients in the sample had hearing complaints associated to many disorders, even with normal hearing, may have become an influence factor on the results.…”

Potencial evocado auditivo de tronco encefálico por via óssea em indivíduos com perda auditiva sensorioneural

“…A análise do PEATE ocorre por meio dos valores de latências absolutas das ondas I, III e V, como também são considerados os valores de latência interpicos, que é o intervalo de tempo entre as ondas 15,[19][20][21][22] .…”

The Effect of Different Stimulation Rates on Brainstem Auditory-Evoked-Potential Responses

“…17 In 1991, the Committee on Infant Hearing American Speech-Language-Hearing Association suggested the use of click stimulus with a 21.1 stimuli/s repetition rate in the rarefaction and condensed polarities, with the justification that, at this rate, wave morphology showed better visual-izations, which would assist with the verification of the presence of cochlear microphonism, to identify auditory neuropathy spectrum disorders. 18 In a study 19 with 59 patients diagnosed with severe or profound hearing loss, the authors modified the characteristics of the click stimulus to sensitize the BAEP performance. According to the authors, changes in the characteristics of the acoustic stimulus in the BAEP with the use of faster stimulation rates may cause less reproduction and clarity of the waves, in contrast to slower stimulation rates, which can increase amplitude and significantly improve the wave pattern.…”