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Original Article

Tone-evoked ABR in full-term and preterm neonates with normal hearing

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Pages 21-29 | Received 31 Oct 2006, Published online: 07 Jul 2009
 

Abstract

This study was designed to investigate the feasibility of applying tone-ABRs in the nursery and neonatal intensive care unit (NICU), and to provide normative tone-ABR data from neonates. Normative tone-ABR latency data were determined. The study obtained intensity series of tone-ABRs from thirty preterm neonates and twenty full-term neonates who had confirmed normal peripheral auditory function after passing both an OAE and ABR screening examination. ABRs were collected in response to 500, 1500, and 4000 Hz tone bursts at 70, 50, 30, and 20 dB nHL. Mean wave V latencies were compared between groups, ears, and by gender. Responses to tone bursts of 20 and 30 dB nHL were detected in 97% and 100% of all ears respectively, in addition to responses to the higher-intensity stimuli. Preterm neonates’ ABRs showed significantly longer latencies than those of the full-term infants. Tone-ABR evaluation was found to be both feasible and reliable as a measure of auditory function in neonates.

Abbreviations
ABR=

Auditory brainstem response

JCIH=

Joint committee on infant hearing

FT=

Full term

GA=

Gestational age

PT=

Preterm

CA=

Conceptional age

OAE=

Otoacoustic emission

Abbreviations
ABR=

Auditory brainstem response

JCIH=

Joint committee on infant hearing

FT=

Full term

GA=

Gestational age

PT=

Preterm

CA=

Conceptional age

OAE=

Otoacoustic emission

Sumario

El estudio fue diseñado para investigar la factibilidad de aplicar ABR con tonos en la sala de neonatos o en la unidad de cuidados intensivos neonatales (UCIN), y para obtener datos normativos para ABR con tonos en neonatos. Se determinaron datos normativos de latencia para ABR con tonos. El estudio obtuvo series de intensidad de ABR con tonos en treinta neonatos de pre-término y en veinte neonatos de término, quienes tenían una función auditiva periférica normal luego de pasar tanto un examen de detección de OAE y de ABR. Los ABR fueron colectados en respuesta a bursts tonales a 500, 1500 y 4000 Hz, a 70, 50, 30 y 20 dB nHL. Se compararon las latencias medias para la onda V entre los grupos de oídos, y por género. Se detectaron respuestas a los bursts tonales a 20 y 30 dB nHL en 97% y 100%, respectivamente, de todos los oídos, además de respuestas a estímulos de mayor intensidad. Los neonatos de pre-término mostraron latencias más prolongadas para los ABR que aquellos de término. Se encontró que la evaluación con ABR con tonos es factible y confiable como una medida de la función auditiva en neonatos.

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