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Original Article

Effect of the Number of Averaged Responses in Transient Evoked Otoacoustic Emissions on the Results of Neonatal Hearing Screening : Efecto del número promediado de emisiones otoacusticas evocadas por transitorios en el tamizaje auditivo nonatal

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Pages 293-299 | Received 03 Jan 2000, Accepted 26 Jun 2000, Published online: 07 Jul 2009
 

Abstract

I This study examined the effect of the number of accepted responses in transient evoked otoacoustic emissions on the results of neonatal hearing screening programmes. The ILO88 Otodynamics Analyzer Quickscreen programme was used for all testing, and a three-stage procedure was adopted by averaging 20, 30, and 260 low-noise samples in total. The results were recorded after each stage of the testing in those cases in which, after the first 20 accepted responses, the “pass” criteria were met. Under these circumstances, 117 ears were included in the study from a total number of 334 screened ears. It was concluded that 20 averaged quiet responses are adequate for screened newborn babies to pass the test if the conditions of the “pass” criteria are fulfilled at this stage. In the rest of the newborn babies, testing should be continued using a larger number of clicks. For diagnostic and clinical purposes, the full 260 quiet samples must be used since the results indicated statistically better scores in response and reproducibility measures after the 260 averaged responses.

Sumario

Este estudio examina el efecto del número promediado de respuestas aceptadas en las emisiones otoacústicas evocadas por transitorios en los progra-mas de tamizaje auditivo infantil. Se utilizó el pro-grama rápido de tamizaje del IL088 de Otodynamics; se realizó el estudio con un total de 20, 30 y 260 promediaciones con bajo ruido. Se grabaron los resultados después de cada etapa de la prueba, en aquellos casos en los que después de los primeras 20 respuestas aceptadas se obtuvo el criterio “pasa”. En estas condiciones se incluyeron 117 oídos de un total de 334 analizados. Se concluyó que 20 respuestas silenciosas son suficientes cuando se alcanza el criterio “pasa” en esa etapa. En el resto de los neonatos, se debe continuar con un mayor número de clicks. Para propósitos clínicos y de diagnóstico, se deben reunir las 260 respuestas; con esta cifra la reproductibilidad y la respuesta en sí es mucho mejor.

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