Relación entre umbrales audiométricos y los estimados mediante potenciales de estado estable en una población de sujetos normales

Abstract

For gaining knowledge in the use of the ASSR for estimating audiogram, correlation between audiometric thresholds for 500, 1000, 2000 and 4000 Hz and those estimated by using ASSR in a normal young population was studied. Carrier frequencies were modulated 100% amplitude and 10% frequency by using 74, 81, 88 and 95 Hz. Correlation was 0.96 between true and estimated threshold except for 2000 Hz where correlation index was 0. 34. Error varies on carrier frequency, better case 6.2 + 4.63 dB for 1000 Hz and worst case 13.5 + 6.25 dB for 2000 Hz. Higher error estimation for 2000 Hz could be due to several factors including modulating frequency used, modulation percentage, and awareness level of the subject, among others and should be studied afterwards. Knowing error value and its behavior will increase the clinical value of ASSR in reaching an objective audiometry that allows a better choice for rehabilitation strategy in non cooperative patients. © Springer-Verlag Berlin Heidelberg 2007.