Object

This publication is protected and available only for logged users.
This publication is protected and available only for logged users.

Title: Usefulness of high frequency audiometry (HFA) in qualifications person to work in noise on high intensity

Abstract:

Noise-induced hearing loss is the hearing loss caused by exposure to recreational and occupational noise. This is the second most common form of sensorineural hearing deficit, after presbycusis. The hearing loss depends on various factors, not only the acoustic parameters like sound intensity, frequency, time of exposure but also individual sensitivity. The hearing loss induced by harmful sounds is totally preventable, and avoiding noise exposure stops further progression of the damage. Because the individual sensitivity to noise is very differentiated, the avoiding of harmful sounds seems to be essential, especially in people exposed on potentially harmful sound levels in their workplaces. Therefore it is important to identify the universal audiometric test that might help in the screening of the early hearing impairment, in people especially sensitive to noise and people exposed to harmful sounds. Conventional audiometry between the frequencies 0.25-8 kHz is a most common tool in the diagnosis of hearing loss. In the present study high frequency audiometry using sounds between 9-20 kHz was applied to determine the early hearing loss in people exposed to harmful sounds. The aim of the present study was to determine the hearing threshold at 0.25-20 kHz in healthy volunteers who were candidates for the noise exposed work. The evaluation of temporary and quantitative shift in threshold values in the fatigue test, following the application of routinely used 1 kHz pitch, which was implemented with an additional sound, 14 kHz, was also performed. The hearing thresholds were estimated at 0.25-20 kHz pitches in patients just before the beginning of the sound exposed work place and after 8 years under exposure. The study group included healthy men, candidates for the work, where the workplace noise exposure was above 85 dB but less than 125 dB. The first audiometric tests were performed in 1998. The tests were repeated following 8 years of exposure in the same group of patients. The audiometric tests were performed in the Medical Diagnostics Center in Huta Sendzimira for Otolaryngological Ambulatory. The audiometric tests began with the following: 1. the evaluation of hearing threshold in conventional-frequency audiometry (0.25-8 kHz) for bone and air conduction and evaluation of hearing threshold in high- frequency audiometry (9-20 kHz). 2. fatigue test (Peyser test), the tested study group was exposed to the pitches at 1 kHz, 100 dB applied during 3 min; after 15 s following the end of pitch application, the consecutive evaluation of hearing threshold was performed for the whole range of frequencies, beginning with 1 kHz. The persons with the presence of the shift were excluded from further participation in the study. 3. The Peyser’s fatigue test was implemented with application of high frequency tone, 14 kHz, the evaluation of the inner ear load measured with the return time to hearing levels was the same as in Peyser test, however included the high frequency pitches (14-20 kHz). In cases with the presence of the shift, the evaluation of hearing threshold was preformed in 4-minutes intervals, until the returning to the initial values. 4. The conventional audiometry was repeated after 8 years at noise exposed workplace. The comparative analysis of obtained results, was performed using the t-Student test for parametric data and Mann-Whitney test for non-parametric data. All calculations were carried out with the use of STATISTICA software v. 7 (StatSoft, USA). Conclusions: 1. In modified Peyser test following the application of high-frequency tone, 14 kHz, the return time after 15s was observed in only 21.5% of study group. In the other 78.5% of study group the shift of return time ranged between 4-24 min. In most of the studied cases (47%) the return time was 4 min. 2. The average values of the return time depended on the return time to initial values. ; In the study group, the return to initial values ranged between 20-24 min, the average values of the return time shift ranged from 40-60dB in 4.9% of examined cases. 3. The study group included young males, in 2nd and 3rd decade of life. Before the exposure to noise work the responses to 14 kHz pitch were obtained in 80.7% for right ear and 79.6% for left ear, while after 8 years of noise exposure the responses to 14 kHz were obtained only in 28.8% for left and right ears. 4. The analysis of modified Peyser test allowed the selection of the group of individuals, who were sensitive to noise, and would remain under special supervision and prevention to protect the hearing in socially efficient range. 5. High-frequency audiometry seems to be more sensitive screening method than conventional audiometry in occupational hearing loss.

Level of degree:

2 - studia doktoranckie

Degree discipline:

otorynolaryngologia

Degree grantor:

Wydział Lekarski

Promoter:

Elżbieta Reroń

Date issued:

2007

Format:

application/pdf

Identifier:

oai:dl.cm-uj.krakow.pl:989

Call number:

ZB-107466

ControlNumberVIRTUA:

click here to follow the link

Access rights:

tylko w bibliotece

Location of original object:

Biblioteka Medyczna Uniwersytetu Jagiellońskiego - Collegium Medicum

Object collections:

Last modified:

Jun 25, 2019

In our library since:

Nov 21, 2012

Number of object content hits:

15

Number of object content views in PDF format

15

All available object's versions:

http://dl.cm-uj.krakow.pl:8080/publication/989

Show description in RDF format:

RDF

Show description in OAI-PMH format:

OAI-PMH

Edition name Date
ZB-107466 Jun 25, 2019
×

Citation

Citation style:

This page uses 'cookies'. More information