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Original Article

Contralateral suppression of otoacoustic emissions in neonates: Supresión contralateral de las emisiones otoacüsticas en recién nacidos

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Pages 211-215 | Received 06 Apr 2001, Accepted 02 Nov 2001, Published online: 07 Jul 2009
 

Abstract

The effect of contralateral acoustic stimulation on transient evoked otoacoustic emissions (TEOAEs) was used to investigate the activity of the medial olivocochlear bundle in neonates. TEOAEs were bilaterally recorded, with and without contralateral noise, in 120 full-term neonates without risk for hearing loss. Otoacoustic emission recordings were carried out using the Otodynamic ILO88 system quickscreener non-linear mode, and the contralateral stimulation was presented at 60 dB SPL delivered by CD player. The results revealed a significant (p < 0.01) contralateral suppression of TEOAE response amplitude: 2.32 dB in females and 3.28 dB in males. This study shows that the suppression effect is present in 88.5% of neonates, with a gender difference (greater suppression in males) and frequency effect, suggesting a functional maturation of the medial olivocochlear bundle in the studied population.

Se utilizó el efecto de la estimulación acüstica contralateral sobre las emisiones otoacüsticas evocadas transientes (EOAET) para investigar la actividad del trato olivococlear medial en recién nacidos. Se grabaron las EOAET bilateralmente, con y sin sonido contralateral, en 120 recién nacidos a termo sin riesgo para pérdida auditiva. Se captaron emisiones otoacusticas por medio del sistema “Otodynamic ILO88” modo “quickscreener” no linear, y la estimulacion contralateral fue presentada en 60 dB SPL por “CD player”. Los resultados revelaron supresión contralateral significante (p < 0.01) en la amplitud de las EOAET: 2.32 dB en el sexo femenino e 3.28 dB en el sexo masculino. Este estudio muestra que el efecto de supresión esta presente en 88.5% de los recién nacidos, con diferencia entre sexos (mayor supresión en el sexo masculino) y efecto de frecuencia, sugerindo maduración funcional del trato olivocolear medial en la populatión estudiada.

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