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Original Articles

Speech detection and localization results and clinical outcomes for children receiving sequential bilateral cochlear implants before four years of age

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Pages 636-646 | Received 19 Aug 2007, Published online: 07 Jul 2009
 

Abstract

The aim of this study was to describe the adaptation to bilateral cochlear implant use and the perceptual benefits demonstrated by 10 children who were successful users of a first implant when a second was received before four years of age. Although one subject rejected the second implant at switch-on, the nine subjects who accepted the device adapted easily to bilateral implant use and developed useful listening skills with the second implant. Tests of localization (left versus right) and speech detection in noise were administered in the unilateral and bilateral conditions, usually after six months experience. All subjects demonstrated some bilateral benefit on speech detection testing (mostly due to a headshadow effect), and the majority localized left versus right. Results suggested that outcomes may be negatively impacted by increased age at the time of second implant switch-on. The majority of the subjects adapted well to bilateral implant use within six months and demonstrated some perceptual benefit and, according to subjective parent reports, improved daily functioning; however, device rejection must be discussed pre-operatively as a possibility.

Abbreviations
BiCI=

Bilateral cochlear implants

CI-1=

Cochlear implant that was received first

CI-2=

Cochlear implant that was received second

SNR=

Signal-to-noise ratio

VRA=

Visual-reinforcement audiometry

Abbreviations
BiCI=

Bilateral cochlear implants

CI-1=

Cochlear implant that was received first

CI-2=

Cochlear implant that was received second

SNR=

Signal-to-noise ratio

VRA=

Visual-reinforcement audiometry

Sumario

El objetivo de este estudio fue describir la adaptación a los implantes cocleares bilaterales y los beneficios perceptuales demostrados en 10 niños que fueron usuarios exitosos de un primer implante, cuando recibieron un segundo antes de los cuatro años de edad. Aun cuando un sujeto rechazó el segundo implante durante la activación, los nueve sujetos que aceptaron el dispositivo se adaptaron fácilmente a su uso bilateral y desarrollaron habilidades útiles con el segundo implante. Las pruebas de localización (izquierda vs derecha) y la detección de lenguaje en ruido se realizaron en condiciones de uni y bilateralidad, generalmente después de seis meses de experiencia. Todos los sujetos demostraron algún beneficio bilateral en la detección del lenguaje (más que nada debido al efecto sombra de la cabeza), y la mayoría localizó izquierda vs derecha. Todo sugiere que los resultados pueden ser influidos negativamente al aumentar la edad en la que se activa el segundo implante. La mayoría de los sujetos se adaptó bien en seis meses al uso del implante bilateral y demostraron algunos beneficios perceptuales, y de acuerdo con los reportes subjetivos de los padres, mejoraron su desempeño cotidiano; sin embargo el rechazo del dispositivo debe ser discutido como una posibilidad, antes de la cirugía.

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