• Journal of Life Science
• /
• v.9 no.2
• /
• pp.136-145
• /
• 1999

The purpose of this study was to evaluate the effect of organic slovents and noise on hearing loss. We selected organic solvents exposed group of 32 cases, noise exposed group of 31 cases, both noise and solvent exposed group of 31 cases, and control group of 53 cases and studied the relation between exposure level of noise and organic solvents and degree of hearing loss. The results were as follows. The subjects under investigation were exposed to noise and organic solvents under threshold limit values and the amount of urinary hippuric acid excretion were also under biological exposure indices. In case of noise, both noise and organic solvents exposed group and noise exposed group were more exposed than organic solvents exposed group(p<0.05). When urinary hippuric acid excretion were concerned, both noise iud organic solvents exposed group and organic solvents exposed group showed higher values than noise exposed group(p<0.05). In comparison of mean auditory threshold values by frequency, on the air conduction test, both noise and organic solvents exposed group showed significantly higher hearing loss than noise exposed group in 500Hz of right ear, 500 and 2000Hz of left ear(p<0.05). Forty-three cases among 147 subjects were regarded as hearing loss group and average age(42.6years) of hearing loss group was higher than normal groups average age of 38.0 years. Urinary hippuric acid excretions of hearing loss group were significantly higher than normal group(p<0.05). Thirty-eight percent(12cases) of noise exposed group, 40.6 $\%$(13cases) of organic solvents exposed group, 51.6 $\%$(16cases) of both noise and organic solvents exposed group, and 3.8 $\%$(2cases) of unexposed group were regarded as hearing losers. Exposed groups showed higher incidence of hearing loss than unexposed group but there were no significant differences among the exposed groups. The variables showing significant correlation with hearing loss were age and the amount of hippuric acid in urinary excretion. When age were adjusted for the purpose of seeing the effects of hearing losses due to organic solvent, urinary excretion of hippuric acids was the only variable with significant correlation with hearing loss (p<0.05). When odds ratio to hearing loss between control and exposed groups was considered, noise exposed group showed 6.1 times (95 $\%$ CI: 3.3-8.7), organic solvents exposed group showed 7.4 times (95 $\%$ CI: 3.5-14.6) and both noise and organic solvents exposed group showed 17.2 times(95% CI: 5.6-31.8) higher values than unexposed group(p<0.01). Above results suggest that health screening test of hearing loss is also needed in organic solvents exposed workers.

• Journal of Preventive Medicine and Public Health
• /
• v.29 no.3 s.54
• /
• pp.539-553
• /
• 1996

The study was conducted from May to September in 1994 to investigate applicability of the Hearing Handicap Inventory for the Elderly-Screening version(HHIE-S) in parallel with the pure-tone audiometer to the initial screening test of noise-induced hearing loss(NIHL) in some noise-exposed workers. Subjects were selected by systemic sampling that took every 10th person from 6, 700 workers taking the annual occupational health examination by the department of Health Maintenance of Dongsan Hospital Keimyung University in Taegu. The authors administered the pure-tone audiometric test and self-reported questionnaire of HHIE-S including items of sociodemographic and job-related variables concurrently. The final subjects analysed were 1,019(488 males and 531 females) excluding fourteen persons who had many missing values in their questionnaires. The reliability coefficients of HHIE-S scale by Cronbach's alpha were 0.84. In the univariate analysis of hearing handicap measured by the HHIE-S, work duration, military service and the hearing threshold loss at 1KHz and 4KHz by the initial audiometer were significant in males while age, work duration and hearing threshold loss at 1KHz and 4KHz were significant in females. In the stepwise linear regression analysis, hearing threshold loss at 1KHz and 4KHz, was the only selected variable explaining the hearing handicap in males and hearing threshold loss at 1KHz and 4KHz, age, and work duration were selected in females. In ROC curves for HHIE-S scores against NIHL as gold standard which was defined by the follow-up audiogram as more than 30dB of the average of 0.5/1/2KHz and 50dB at 4KHz, the optimal cutoff for the parallel HHIE-S appeared to be 8. The results suggest that HHIE-S appeared to have some reliability and validity in this data and might be used in screening NIHL in parallel with pure-tone audiometer in noise-exposed workers.

• KOREAN ASSOCIATION OF OCCUPATIONAL HEALTH NURSES
• /
• v.4 no.4 s.14
• /
• pp.55-61
• /
• 1997

• KOREAN ASSOCIATION OF OCCUPATIONAL HEALTH NURSES
• /
• v.4 no.4 s.14
• /
• pp.51-54
• /
• 1997

• KOREAN ASSOCIATION OF OCCUPATIONAL HEALTH NURSES
• /
• v.17 no.2
• /
• pp.44-47
• /
• 2010

• Journal of Preventive Medicine and Public Health
• /
• v.32 no.1
• /
• pp.30-39
• /
• 1999

Objectives. This study was carried out to evaluate hearing impairment judgement and to investigate the differences in various diagnostic criteria for noise-induced hearing loss (NIHL) among workers who required for close observation (C). Methods. Out of 731,029 workers who had taken the specific periodic health examination in 1994, we used the audiometric data on 37,999 workers (C) eliminating the employees who had previous otologic problems. Many investigators have being using different criteria for the evaluation of hearing impairment. In this study, we used the criteria of early (1989-1994), current, compensation for NIHL in Korea, 2-, 3-, 4-divided classification and hearing loss at 4,000 Hz and compared the evaluation results. Results. The prevalences of C and workers who had occupational disease $(D_1)$ diagnosed for NIHL were 11.1 % and 0.44 %. There were significant difference in the prevalences of C and $D_1$, depending on different province of Korea. Pure tone averages (PTAs) were not appropriately applied in their evaluation 97% of workers whom we studied on were below the level of mild hearing loss judged by ISO standard. However, there were wide variations in the prevalence rate of mild hearing loss by diagnostic criteria. Thus, there were different judgements in determining the degree of NIHL depending on which diagnostic criteria were utilized. PTAs were found 20.54 (Rt) and 20.74 (Lt) when the method of 3-divided classification was applied for audiometric data. The degree of hearing impairment of the left ear was more severe than that of right ear. The prevalence of normal hearing threshold below 20 dB was 75.4% and the range of difference in both ear was below 10 dB. Right sided hearing threshold levels were 21.08 dB (500 Hz), 18.44 dB (1,000 Hz), 22.09 (2,000 Hz) and 52.36 dB (4,000 Hz). There was typical high frequency loss (C5-dip at 4,000 Hz) above 30 - 40 dB in normal hearing level. The increasing trend in hearing threshold level was gradually decreased by the increase of PTAs. The difference between PTAs and threshold at 4,000 Hz was about 10 dB. Conclusions. We could found that PTAs in the previous examination were not appropriately evaluated. This study revealed that they did not use unique criteria for managing the workers of NIHL. For the prevention of NIHL, it was found that the quality control on diagnosis and comprehensive management program were required, especially for those of hearing loss (C).

• Proceedings of the KIEE Conference
• /
• 2008.10b
• /
• pp.201-202
• /
• 2008

난청은 가장 흔한 선천성 장애이다. 이 질병의 발생 빈도는 신생아 1000명 출생 당 $1{\sim}3$명 정도로 상당히 높다. 이러한 청력 장애가 조기에 발견된다면 수술적인 치료 등으로 예방할 수 있으나 그렇지 못할 경우 언어와 학습장애를 초래하게 된다. 이런 관점을 근거로 신생아를 대상으로 한 선천성 난청의 선별검사는 큰 의미를 가지며 난청환자의 조기발견을 위한 노력이 필수적이라 할 수 있다. 기존의 수동 청력검사 시스템은 신생아 청력 평가시 검사자의 주관성에 의존하게 되므로, 청성뇌간 반응의 뇌파분석이 잘못될 가능성이 커진다. 따라서 본 연구에서는 청력 역치를 자동으로 판독하여 결과를 나오도록 개발하고자 하였으며, 또한 기존 제품들과는 차별화하여 휴대용으로 개발하여 차폐실이 아닌 일반 병실에서도 검사가 가능하도록 함에 따라 유소아의 청각 장애를 극복시키는데 기여하고자 하였다.

• Proceedings of the KOR-BRONCHOESO Conference
• /
• 1987.05a
• /
• pp.7.1-7
• /
• 1987

청력장애가 있고 반복성 뇌막염을 앓는 환자에서는 일단 외임파누공을 의심하고 이에 대한 이비인후과 의사의 철저한 진찰 및 검사를 통해 진단 및 치료에 임해야 하겠다. 저자들은 최근에 경험한 재발성 뇌막염 환아에서 외임파누공을 진단하고 치료한 2예를 보고하고자 한다. 선천적으로 청력장애가 있고 수술전 1년동안 5∼6회의 뇌막염을 앓은 환아를 이학적검사, 청력검사 및 전산화 단층촬영을 이용하여 외임파누공을 진단하고 근막을 포함한 연조직으로 누공을 봉쇄하는 수술적 요법을 사용하여 완치시켰기에 문헌고찰과 함께 보고하는 바이다.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1998_1999
• /
• 2009

본 연구에서는 단일 청력검사 모듈에서 여러 가지 작업들을 동시에 운용할 수 있는 멀티스레딩 기법의 구현을 통하여, 청력검사 시스템에서 피검사자가 검사가 진행되는 동안 언제든지 응답 결과를 확인하거나 또는 수정할 수 있도록 하는 휴대용 어음청력검사 시스템을 구현하고자 하였다.

• Proceedings of the KOR-BRONCHOESO Conference
• /
• 1987.05a
• /
• pp.8.2-8
• /
• 1987

돌발성 난청은 환자에게 듣지 못하게 된다는 공포를 야기하는 질환이며 아직 확실한 병인이나 치료법이 확정되어 있지는 않다. 저자들은 인제의대 서울백병원 이비인후과에서 입원 및 동일한 치료를 받은 15례의 돌발성 난청 환자에 대하여 임상 분석하여 다음과 같은 결과를 얻었다. 1) 청력회복은 Siegel의 분류로서 완전회복 1례, 부분회복 2례, 경도회복 5례, 무회복이 7례이었다. 2) 현훈이 있었던 10례중 4례에서만 회복이 있었으나 현훈이 없던 5례중 4례가 회복되었다. 3) 청력손실이 완전농인 8례중 6례에서 무회복이었다. 4) 발병 8일 이내인 경우 치료시작 시기와 청력 회복사이 에는 연관이 없었다. 5) 적혈구침강속도(ESR)과 청력회복 사이에는 연관이 없었다.