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Original Article

Transient-evoked and distortion product otoacoustic emissions: A short-term test-retest reliability study

, , , , , , & show all
Pages 99-109 | Received 23 Sep 2008, Accepted 01 Sep 2009, Published online: 15 Feb 2010
 

Abstract

Abstract

Knowledge regarding the variability of transient-evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) is essential in clinical settings and improves their utility in monitoring hearing status over time. In the current study, TEOAEs and DPOAEs were measured with commercially available OAE-equipment in 56 normally-hearing ears during three sessions. Reliability was analysed for the retest measurement without probe-refitting, the immediate retest measurement with probe-refitting, and retest measurements after one hour and one week. The highest reliability was obtained in the retest measurement without probe-refitting, and decreased with increasing time-interval between measurements. For TEOAEs, the lowest reliability was seen at half-octave frequency bands 1.0 and 1.4 kHz; whereas for DPOAEs half-octave frequency band 8.0 kHz had also poor reliability. Higher primary tone level combination for DPOAEs yielded to a better reliability of DPOAE amplitudes. External environmental noise seemed to be the dominating noise source in normal-hearing subjects, decreasing the reliability of emission amplitudes especially in the low-frequency region.

Sumario

Es esencial conocer la variabilidad de las emisiones otoacústicas evocadas por transitorios (TEOAEs) y por productos de distorsión (DPOAEs) en ambientes clínicos para mejorar su utilidad en el monitoreo de la condición auditiva en el tiempo. En este estudio se midieron TEOAEs y DPOAEs con equipo de OAE comercialmente disponible en 56 oídos normales durante tres sesiones. La confiabilidad se analizó en el retest sin re-colocar la sonda, en el retest inmediato con recolocación de la sonda y con mediciones después de una hora y una semana. La mayor confiabilidad se obtuvo en el retest sin recolocación de la sonda y disminuyó a aumentar el intervalo entre mediciones. Con TEOAEs la confiabilidad más baja se observó en bandas de frecuencia en 1.0 y 1.4 kHz mien-tras que para las DPOAEs también la banda de frecuencia de media octava de 8 kHz tuvo también confiabilidad pobre. La combinación de niveles tonales primarios superiores con DPOAEs, llevó a una mejor confiabilidad de las amplitudes de las DPOAEs. El ruido ambiental externo parece ser la fuente de ruido dominante en sujetos normales, disminuyendo la confiabilidad de las amplitudes de la emisión, especialmente en la región de las frecuencias graves.

Acknowledgements

Hannah Keppler is funded by a Ph.D. student scholarship of the Research Foundation – Flanders (FWO), Belgium.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper

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