|
KMID : 0858620050090010056
|
|
Korean Journal of Audiology
2005 Volume.9 No. 1 p.56 ~ p.64
|
|
|
Comparison of Hearing Threshold Levels and Distortion Product Otoacoustic Emissions by History of Military Service
|
|
Lee Jae-Seok
Kim Beom-Gyu
Kim Yong-Bok
Park Il-Seok
Oh Sang-Yong
|
|
|
Abstract
|
|
|
Objective: Distortion product otoacoustic emissions (DPOAEs) can be used for screening status of cochlear by ototoxic drugs or loud noise. Also Distortion product otoacoustic emissions (DPOAEs) are increasingly used as an objective test for noninvasive hearing screening. The present study aimed to examine significant differences of ear of those who have performed and not performed military service in normal twentieth hearing adults with pure-tone audiometric thresholds and DPOAEs.
Design: A total of 40 males normal hearing adults with no reported history of middler ear disorder or congenital family hearing impairment (hearing levels ≤20 dB HL at 0.5-8 kHz frequencies) participated in this study. Especially these subjects have not experienced exposure to noise or ototoxic drugs, but the only 20 males were exposed to noise during military service period.
Results: Results revealed significant differences in hearing threshold levels (HTLs) and DPOAEs of two groups. Especially HTLs of the performance of military service males were only small increased significantly at 3 kHz (2.9 dB HL), but absolute amplitude of DPOAEs were reduced significantly at 3 kHz (3.8 dBSPL), 4 kHz (4.9 dBSPL), and the relative amplitude of DPOAEs were decreased significantly at test frequencies 1 kHz (2.7 dB), 3 kHz (2.8 dB), and 4 kHz (3.3 dB). And in the performance of military service males, the pure-tone audiometric thresholds and DPOAEs showed a higher correlation at high frequency of 4 kHz (-0.66 and -0.53).
Conclusion: We have shown that impulse noise from weapons exposed in military service period can cause permanent hearing loss by damaged outer hair cells of cochlea. It has been suggested that DPOAEs more sensitive in detecting very small status changes of outer hair cells following short duration noise exposure than pure-tone audiometric thresholds may help predict the susceptibility to noise induced hearing loss(NIHL).
|
|
|
KEYWORD
|
|
|
Pure-tone audiometry, Distortion product otoacoustic emissions, Outer hair cell, Military
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|