Potenciales evocados auditivos de estado estable en recien nacidos: diferencias en la conduccion oseo-aerea a las frecuencias de 500 y 2000 Hz

María del Carmen Hernández Cordero; Ileana  Alonso Rodríguez

doi:10.51445/sja.auditio.vol4.2015.0053

Authors

María del Carmen Hernández Cordero Departamento de Fonoaudiología. Centro de Neurociencias de Cuba. La Habana. Cuba
Ileana Alonso Rodríguez Hospital Materno Infantil Ramón González Coro, La Habana, Cuba

DOI:

https://doi.org/10.51445/sja.auditio.vol4.2015.0053

Keywords:

auditory steady-state responses, air conduction, bone conduction

Abstract

Introduction: Auditory Steady State Evoked Responses (ASSR) constitute a valid method for the objective evaluation of hearing. The detection of responses in newborns based on stimulation by air and bone is a subject little published in the literature, constituting an interesting topic for the proposal of this technique as a tool for hearing screening.

Objective: To determine the differences in hearing thresholds with ASSR in newborns at frequencies of 500 and 2000 Hz, presenting stimuli by air and bone.

Material and Method: A group of 15 newborns was evaluated with ASSR until obtaining the electrophysiological threshold at the frequencies of 500 and 2000 Hz, stimulating the airway and bone independently.

Results: A significant difference is obtained in the auditory response thresholds as a function of the stimulation pathway and frequency. In bone conduction, responses were obtained at a lower intensity (24 ± 7) at 500 Hz, compared with the results obtained for the air conduction (46 ± 6) at the same frequency. For 2000 Hz there was an opposite effect with a higher detection for the air conduction, obtaining a mean threshold value (30 ± 8) lower than the result for the bone conduction (41 ± 6).

Conclusions: The results obtained allow us to conclude that the best frequency for the exploration of the airway in newborns is 2000 Hz and for the bone route 500 Hz.

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