Daniela Polo Camargo Silva,Georgea Espindola,
Electrophysiological Threshold Evaluation in Infants with and Without Risk Indicators for Hearing Loss
Journal of Surgery and Rehabilitation
2019
2733-2551
http://dx.doi.org/10.31487/j.JSR.2019.01.06
https://www.sciencerepository.org/electrophysiological-threshold-evaluation-in-infants-with-and-without-risk-indicators_JSR-2019-1-106 
Abstract: Introduction: The brainstem auditory evoked potential is used to determine the electrophysiological
threshold and assessing the integrity of the auditory system. This test is sensitive to the auditory nerve
maturation and brainstem; therefore, the electrophysiological threshold may change throughout child
development.
Objective: to evaluate the changes in the electrophysilogical threshold of brainstem auditory evoked
potential in two months of follow-up.
Methods: A single non-concurrent cohort study was performed in a public hospital during January 2013 to
January 2015. The brainstem auditory evoked potential was performed in all neonates in two moments with
electrophysiological thresholds measured in the both ears, whose results were categorized into degree: mild,
moderate, severe and profound.
Results: Forty-three infants of both genders, 11 with prematurity and 14 with risk indicators for hearing
loss participated in the study. In the first brainstem auditory evoked potential, with an average age of two
months, 34 infants had abnormal results in the right ear and 31 in the left ear. In the second brainstem
auditory evoked potential, with na average age of four months, normalization was observed in 38% of the
results obtained in the right ear and in 42% on the left ear. This significant change in brainstem auditory
evoked potential thresholds was found in those with mild and moderate degrees.
Conclusion: There were changes in the electrophysiological brainstem auditory evoked potential thresholds
in infants with a mild and moderate degree, while those with a severe and profound degree the results were
permanet at two months of follow-up.Keywords: Hearing loss, neonatal screening, auditory pathways, neonate, risk indicator