Extratympanic electrocochleography in the diagnosis of auditory neuropathy/auditory dyssynchrony.
The brainstem auditory evoked potential (BAEP) is being extensively used as a method for the evaluation of cochlear function in individuals with diagnosis of auditory neuropathy/auditory dyssynchrony (AN/AD). In the absence of otoacoustic emissions, many cases of AN/AD have been diagnosed by the presence of CM identified in the BAEP.


OBJECTIVE
to demonstrate the clinical applicability of extratympanic electrocochleography (ET-Ecochg) in the differential diagnosis of AN/AD compared to the BAEP.


METHODS
a 4-year-old child with a diagnosis of AN/AD seen at the Audiological Research Center was submitted to ET-Ecochg with a 2000 Hz tone burst in rarefaction and condensation polarities.


RESULTS
the ET-Ecochg exam was illustrated. Using an appropriate protocol, it was possible to demonstrate CM and to confirm it in the Ecochg, with a recording quality superior to that obtained in the BAEP.


CONCLUSIONS
ET-Ecochg permitted a more detailed analysis of CM compared to the BAEP, thus showing clinical applicability for the investigation of cochlear function in AN/AD.
Anastasio
Adriana Ribeiro Tavares
AR
FMRP, USP, SP, Brazil.
Alvarenga
Kátia de Freitas
Kde F
Costa Filho
Orozimbo Alves
OA
D001308:Auditory Perceptual Disorders / Q000175:diagnosis* / Q000503:physiopathology; D002675:Child, Preschool; D003055:Cochlear Microphonic Potentials / Q000502:physiology*; D003937:Diagnosis, Differential; D004594:Electrophysiology / Q000379:methods*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D034381:Hearing Loss / Q000175:diagnosis*; D006801:Humans; D015203:Reproducibility of Results; D000160:Vestibulocochlear Nerve Diseases / Q000175:diagnosis* / Q000503:physiopathology