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Suppression of otoacoustic emissions in neonates at risk for hearing loss

Author(s):
Paula Maria Faria Martins
Total Authors: 1
Document type: Master's Dissertation
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Ciências Médicas
Defense date:
Examining board members:
Alessandra Spada Durante; Christiane Marques do Couto
Advisor: Maria Francisca Colella dos Santos
Abstract

Introduction: Studies show that there are differences in the values of suppression of otoacoustic emissions compared groups of neonates without risk for hearing loss and those with some risk. The olivocochlear system function, as measured by suppression of otoacoustic emissions, may indicate an inhibitory function in infants with hearing reduced risk indicators for hearing loss. Objective: To investigate the activity of the efferent auditory system in neonates who present risk indicators for retrocochlear hearing loss, through research of the suppression of otoacoustic emissions. Method: Research suppression of otoacoustic emissions accomplished through the cochlear emissions analyzer ILO V6 - OTODYNAMICS -292 USB connected to a computer and probes for contralateral suppression. Participants were 109 neonates who were gathered in three groups. GI, consisted of 42 neonates who present a risk indicator for retrocochlear hearing loss, GII for 17 neonates who present risk factors unrelated bouts retrocochlear and GIII for 50 neonates without risk indicators for hearing loss. The study design was cross-sectional. Results: We found average values of suppression of otoacoustic emissions higher in GII, followed by GI and GIII. We observed that the highest values are found in groups without risk factors for retrocochlear hearing loss, but differences were not statistically significant. Conclusions: The white noise presented contralaterally reduced the response level of otoacoustic emissions, demonstrating the involvement of the medial efferent system in the suppression effect. The risk indicator for retrocochlear hearing loss was not a relevant factor in the study of suppression of otoacoustic emissions in neonates. (AU)

FAPESP's process: 10/13322-8 - Suppression of otoacoustic emissions in neonates at risk for hearing loss
Grantee:Paula Maria Faria Martins
Support type: Scholarships in Brazil - Master