Efferent inhibition of otoacoustic emissions in preterm neonates

ABSTRACT INTRODUCTION: Abnormalities in auditory function of newborns may occur not only because of preterm birth, but also from the use of medications and from diseases related to prematurity. OBJECTIVE: To analyze the inhibitory effect from stimulation of the olivocochlear efferent system on transient evoked otoacoustic emissions in preterm neonates, comparing these data with those from full-term neonates. METHODS: This was a prospective, cross-sectional, contemporary cohort study with 125 neonates, pooled into two groups: full-term (72 full-term neonates, 36 females and 36 males, born at 37-41 weeks of gestational age); and preterm (53 neonates, 28 males and 25 females, born at ≤36 weeks of gestational age, evaluated at the corrected gestational age of 37-41 weeks). Otoacoustic emissions were recorded using linear and nonlinear click-evoked stimuli, with and without contralateral stimulation. RESULTS: The inhibitory effect of the efferent pathway in otoacoustic emissions was different (p = 0.012) between groups, and a mean reduction of 1.48 dB SPL in full-term births and of 1.02 dB SPL in preterm births was observed for the non-linear click-evoked stimulus. CONCLUSION: The results suggest a reduced inhibitory effect of the olivocochlear efferent system on otoacoustic emissions in preterm neonates.

Bibliographic Details

Main Authors:	Carvallo,Renata Mota Mamede, Sanches,Seisse Gabriela Gandolfi, Ibidi,Silvia Maria, Soares,Jordana Costa, Durante,Alessandra Spada
Format:	Digital revista
Language:	English
Published:	Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. 2015
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1808-86942015000500491
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