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Original Article

A longitudinal study of changes in evoked otoacoustic emissions and pure-tone thresholds as measured in a hearing conservation program

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Pages 307-322 | Received 19 Feb 2003, Accepted 27 Jun 2003, Published online: 07 Jul 2009
 

Abstract

Non-linear transient-evoked otoacoustic emissions (TEOAEs) at 74 dB pSPL, distortion-product otoacoustic emissions (DPOAEs) at 65/45 dB SPL and pure-tone audiometry were used to detect noise-induced, inner ear changes in a longitudinal study. Repeated-measures ANOVAs were made on the Noise (n=69) and Quiet (n=42) groups. The Noise group's hearing thresholds increased by 1.2 dB and DPOAE amplitude decreased by −0.9 dB. For both groups, TEOAE amplitude decreased by approximately −0.6 dB. Eight of 12 ears with permanent threshold shift (PTS) and 10 of 13 ears with temporary threshold shift (TTS) showed TEOAE decrements or low baseline TEOAE amplitudes. Fewer TTS and PTS ears also showed DPOAE decrements, and there was never a DPOAE decrement without a corresponding TEOAE decrement or low TEOAE baseline. Some TTS ears showed permanent emission decrements. Although otoacoustic emissions show promise in detecting noise-induced inner ear changes, it is premature to use them in hearing conservation programs.

Sumario

En un estudio longitudinal se utilizaron emisiones otoacu´sticas evocadas por transitorios (TEOAE) a 74 dB pSPL, productos de distorsio´n (DPOAE) a 65/45 dB SPL y audiometri´a por tonos puros para detectar los cambios inducidos por ruido en el oi´do interno en un estudio longitudinal. Se realizaron mediciones ANOVA en repetidas ocasiones en los grupos de ruido (n=69) y silencio (n=42). Los umbrales del grupo de ruido aumentaron en 1.2 dB HL. En mbos grupos la amplitud de las emisiones disminuyo´ aproximadamente 0.6 dB SPL. Ocho de los 12 oi´dos con aumento permanente del umbral (PTS) y 10 de los 13 oi´dos con aumento temporal del umbral (TTS) mostraron decremento de las TEOAE o disminucio´n de la li´nea basal de su amplitud. Menos oi´dos con TTS y PTS tambie´n mostraron decremento en las DPOAE, y nunca hubo un decremento de DPOAE sin la correspondiente disminucio´n en TEOAE o en la li´nea basal de TEOAE. Algunos oi´dos con TTS mostraron decremento permanente de las emisiones. Aunque las emisiones otoacu´sticas son prometedoras en la deteccio´n de cambios por ruido en el oi´do interno, es prematuro utilizarlas en los programas de conservacio´n de la audicio´n.

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