LS CE-Chirp®vs. Click in the neuroaudiological diagnosis by ABR.
BACKGROUND
The chirp stimulus was developed seeking to counterbalance the delay of the sound wave on its journey through the cochlea, allowing the hair cells to depolarize at the same time. The result is a simultaneous stimulation providing better neural synchrony and, consequently, the recording of responses with greater amplitudes.


OBJECTIVE
To compare the absolute latency of waves I, III and V, the interpeak intervals I-III, III-V and I-V, amplitude values of wave V and its association with the amplitude of wave I, and the interaural difference V-V in the auditory brainstem response (ABR) using Click and LS CE-Chirp®stimuli to determine whether the responses evoked by LS CE-Chirp®could be applied to neuroaudiological diagnosis.


METHODS
Cross-sectional study with 30 normal-hearing individuals. The parameters used were: intensity of 85dBnHL, alternating polarity; 17.1 stimuli/s and 100-3000Hz filters.


RESULTS
The absolute latencies of waves I, III and V observed with LS CE-Chirp®and click did not show significant differences. Significantly higher amplitudes of wave V were observed with the LS CE-Chirp®. The interaural difference between the wave V latencies between stimuli showed no significant difference.


CONCLUSIONS
The LS CE-Chirp®stimulus was shown to be as efficient as the click to capture ABR at high levels of stimulation, with the advantage of producing greater-amplitude V waves.
Universidade Federal de Santa Maria (UFSM), Distúrbios da Comunicação Humana, Santa Maria, RS, Brazil. Electronic address: michellecargnelutti@gmail.com.
Michelle
M
Cargnelutti
Clinica Coser de Otorrino, Santa Maria, RS, Brazil.
Pedro Luis
PL
Cóser
Clinica Coser de Otorrino, Santa Maria, RS, Brazil; Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
Eliara Pinto Vieira
EPV
Biaggio
D000161:Acoustic Stimulation / Q000379:methods*; D000293:Adolescent; D000328:Adult; D001309:Auditory Threshold / Q000502:physiology; D002648:Child; D003430:Cross-Sectional Studies; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009422:Nervous System Diseases / Q000175:diagnosis* / Q000503:physiopathology; D011930:Reaction Time / Q000502:physiology*; D055815:Young Adult
Auditory brainstem response; Audição; Electrophysiology; Eletrofisiologia; Hearing; Potenciais evocados auditivos