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Original Articles

Estimation of pure-tone thresholds in adults using extrapolated distortion product otoacoustic emission input/output-functions and auditory steady state responses

, , , , , , & show all
Pages 625-631 | Received 06 Nov 2008, Published online: 09 Sep 2009
 

Abstract

Pure-tone thresholds were used as the reference and compared with extrapolated distortion product otoacoustic emission input/output-functions and auditory steady state responses (ASSR) in hearing-impaired adults, using the Cochlea-Scan and Audera devices. Fifty-three subjects presenting sensorineural deficits were included in the study. The DPOAE data were recorded using the detailed Cochlea-Scan threshold modality, and ASSR responses were assessed at 1.0, 2.0, and 4.0 kHz. The comparison between DPOAE and ASSR threshold values indicated significant mean differences across all tested frequencies. Significant relationships were observed between the behavioral and the DPOAE measurements in the lower frequencies (1.5 and 2.0 kHz). The Cochlea-Scan algorithm seems to overestimate hearing threshold. Logistic regression models (probability of DPOAE response p = 0.9), suggested that the identifiable hearing levels are less than 34 dB HL (at 2.0 and 4.0 kHz) and less or equal to 38 and 40 dB HL at 1.5 and 6.0 kHz respectively. The Cochlea-Scan DPOAE protocols can be used in cases presenting mild hearing deficits (i.e.<40 dB HL).

Abbreviations
ASSR=

Auditory steady state responses

DPOAE=

Distortion product otoacoustic emission

Abbreviations
ASSR=

Auditory steady state responses

DPOAE=

Distortion product otoacoustic emission

Sumario

Se utilizaron los umbrales tonales como referencia, y se compararon con la función de entrada/salida de las emisiones otoacústicas por productos de distorsión y las respuestas evocadas de estado estable (ASSR) en adultos hipoacúsicos, utilizando los equipos Cochlea-Scan y Audera. Se incluyeron en el estudio cincuenta y tres sujetos con hipoacusia neurosensorial. Los DPOAE se recolectaron utilizando la modalidad detallada del Cochlea-Scan y las respuestas ASSR se registraron en 1.0, 2.0 y 4.0 kHz. La comparación entre los umbrales DPOAE y ASSR indicó diferencias significativas en promedio a lo largo de todas las frecuencias examinadas. Se observaron relaciones significativas entre las mediciones conductuales y los DPOAE en las frecuencias bajas (1.5 y 2.0 kHz). El algoritmo de Cochlea –Scan parece sobrestimar los umbrales tonales. Los modelos de regresión logística (la probabilidad de una respuesta de DPOAE p = 0.9) sugirieron que los niveles de audición son menores a 34 dB HL (en 2.0 y 4.0 kHz) y menores o iguales a 38 y 40 dB HL en 1.5 y 6.0 kHz respectivamente. Los protocolos de DPOAE Cochlea Scan DPOAE pueden ser utilizados en casos que presenten hipoacusia leve i.e. <40 dB HL).

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