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Distribution of Asymmetrical Hearing Loss Among the Workers participated in Noise-specific Health Examination / 대한산업의학회지
Korean Journal of Occupational and Environmental Medicine ; : 361-372, 1999.
Artigo em Coreano | WPRIM | ID: wpr-7080
ABSTRACT

OBJECTIVES:

Noise-induced hearing lose(NIHL) is characterized by bilaterally symmetrical hearing loss, but some screening audiometries of employees who were exposed noise showed asymmetry. Therefore, this study was carried out to evaluate distribution of asymmetrical hearing loss and factors influencing asymmetries.

METHODS:

Study subjects were 294 male employees who have participated in 1st and 2nd noise-specific health examination.

RESULTS:

The interaural threshold difference of 20 dB or more at 4,000 Hz was classified as asymmetry. Among 294 NIHL employees. 19% had left asymmetric hearing loss. 22% had right asymmetric hearing loss. and overall asymmetry were 41%. Prevalence of asymmetry at 4,000 Hz significantly more decreased in middle(80~84 dB (A)) and high-level noise exposure groups(> or =85 dB(A)) than low-level exposure group and significantly increased as greater hearing threshold level in the worse ear. Prevalence of left asymmetry at 4,000 Hz significantly increased as greater hearing threshold level in the worse ear than right asymmetry. The interaural difference was significantly greater in the left asymmetry.

CONCLUSIONS:

Noise exposure produced asymmetric hearing loss(interaural asymmetry was 20 dB and more in 41% of case) and left ear was more susceptible to noise demage than right ear.
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Audiometria / Programas de Rastreamento / Prevalência / Orelha / Audição / Perda Auditiva / Ruído Tipo de estudo: Estudo de prevalência / Estudo prognóstico / Estudo de rastreamento Limite: Humanos / Masculino Idioma: Coreano Revista: Korean Journal of Occupational and Environmental Medicine Ano de publicação: 1999 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Audiometria / Programas de Rastreamento / Prevalência / Orelha / Audição / Perda Auditiva / Ruído Tipo de estudo: Estudo de prevalência / Estudo prognóstico / Estudo de rastreamento Limite: Humanos / Masculino Idioma: Coreano Revista: Korean Journal of Occupational and Environmental Medicine Ano de publicação: 1999 Tipo de documento: Artigo