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Original Article

Distortion product otoacoustic emissions in patients with King-Kopetzky syndrome

Emisiones otoacústicas por productos de distorsion en pacientes con el síndrome de King-Kopetzky

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Pages 34-39 | Received 07 Dec 2004, Published online: 07 Jul 2009
 

Abstract

In the present study, mild impairment of cochlear function in patients with King-Kopetzky syndrome was investigated using DPOAEs. A significant decrease in DPOAE levels in both ears was found in patients with King-Kopetzky syndrome compared with the controls after considering the thresholds as a co-variable. It is noteworthy that the global mean levels of DPOAEs were still significantly greater in controls than in patients with matched thresholds. Further frequency analyses showed a significant decrease in DPOAE levels over the mid- and high-frequency range in patients with better hearing thresholds when compared with those in the control group. Moreover, significantly smaller DPOAEs were found in the ears of patients with King-Kopetzky syndrome and without SOAEs, than in such ears of control subjects after considering the thresholds as a co-variable. However, when SOAEs were present there was no difference. Decreases in DPOAE level appear to represent evidence of minor cochlear pathology, and provide a pathological basis for the difficulty of hearing speech in the presence of background noise, which characterizes King-Kopetzky syndrome.

Sumario

En el presente estudio, se investigó una leve alteración en la función coclear en pacientes con el síndrome de King-Kopetzky usando DPOAE. Se encontró una disminución significativa en los niveles de intensidad de las DPOAE en ambos oídos en pacientes con este síndrome, al compararlos con los controles, luego de considerar el umbral como una co-variable. Es digno de resaltar que los niveles globales medios de las DPOAE fueron aún significativamente mayores en los controles que en los pacientes con umbrales correspondientes. Un análisis de frecuencia ulterior mostró una disminución significativa en los niveles de las DPOAE, en el rango de frecuencias medias y altas, en pacientes con los mejores umbrales auditivos, al compararlos con aquellos del grupo control. Más aún, se encontraron DPOAE significativamente menores en la audición de pacientes con el síndrome de King-Kopetzky y ausencia de SOAE, comparados con los oídos de sujetos control, luego de considerar el umbral como una co-variable. Sin embargo, cuando las SOAE estuvieron presentes, no hubo diferencia. La disminución en el nivel de intensidad de las DPOAE parece representar evidencia de patología coclear menor, y aporta una base patológica para explicar la dificultad para entender el lenguaje en presencia de ruido de fondo, que caracteriza al síndrome de King-Kopetzky.

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