Annals of Occupational and Environmental Medicine

Original Article

The impact of alcohol consumption on hearing loss in male workers with a focus on alcohol flushing reaction: the Kangbuk Samsung Cohort Study: Jaehong Lee, Youshik Jeong, Jihoon Kim, Seonghyeon Kwon, Eunhye Seo, Jinsook Jeong, Woncheol Lee; Ann Occup Environ Med 2024;36:e1. Published online January 22, 2024; DOI: https://doi.org/10.35371/aoem.2024.36.e1

Abstract Abstract in Korean PDF Supplementary Material PubReader ePub: Background
Despite hearing loss being a prevalent chronic condition, estimated to nearly 20% of the global population by the World Health Organization, the specific association with individual lifestyle factors, particularly alcohol consumption, remains unclear. In South Korea, approximately 80% of the population engages in alcohol consumption, with a notably high prevalence among males, indicating a high-risk drinking pattern. Therefore, this study aimed to assess the correlation between alcohol consumption and hearing loss in male workers, as well as to analyze additional variables such as alcohol flushing reaction, with the intention of improving worker health.
Methods
The study was conducted from January 2012 to December 2019, targeting 114,114 participants who visited Kangbuk Samsung Hospital Total Healthcare Centers. Data were collected through pure-tone audiometry tests and alcohol-related questionnaire, and statistical analysis was performed using Cox regression analysis. Based on previous studies indicating a potential protective effect of light drinking on hearing loss, this group was designated as the reference. Additionally, stratified analyses were conducted based on the presence of alcohol flushing reaction and different working hours.
Results
The hazard ratio (95% confidence interval) for hearing loss was higher in the heavy drinking group (1.23 [1.11–1.37]) compared to the moderate drinking group (1.09 [0.98–1.20]). Stratified analyses revealed a significantly elevated the hazard ratio of hearing loss in groups with alcohol flushing reaction compared to those without this factor.
Conclusions
Our study demonstrated that moderate or heavy alcohol consumption in male workers can increase the risk of hearing loss, particularly in those with alcohol flushing reaction. These findings underscore the importance of addressing alcohol-related factors concerning hearing health among male workers.; 알코올 안면홍조 중심으로 살펴본 남성 근로자에서 음주습관이 청력손실에 미치는 영향: 강북삼성 코호트연구
목적
청력손실은 세계보건기구(WHO)가 인구 20% 가까이로 그 유병률을 추정할 만큼 흔한 만성질환임에도 불구하고 개인의 생활습관 요인, 특히 음주에 따른 연관성은 아직 명확하게 밝혀진 바 없다. 한국건강증진개발원에 따르면 대한민국의 음주 인구는 80%에 육박하며 남성의 고위험 음주율이 특징적으로 높았다. 따라서 우리는 청력손실과 관련된 근로자 건강 증진을 도모하고자 남성 근로자에서 음주습관 및 청력손실 간 연관성 평가 및 알코올 안면홍조 추가 변수 분석을 수행하였다.
방법
연구는 2012년 1월부터 2019년 12월 사이 강북삼성병원 종합건강검진센터에 방문한 114,114명의 수검자들을 대상으로 이루어졌다. 순음청력검사 및 음주 설문으로 데이터를 수집하였고 통계 분석은 Cox 회귀분석을 실시하였다. 과거 연구들에서 가벼운 음주가 오히려 청력손실에 보호효과를 나타내었으므로 해당 그룹을 참조(reference)로 지정하였다. 추가적으로 알코올 안면홍조 여부에 따른 층화분석을 시행하였다.
결과
청력손실의 위험비(95% 신뢰구간)는 중간 음주 그룹 1.09(0.98-1.20)에 비해 대량 음주 그룹이 1.23(1.11-1.37)로 더 높았다. 층화분석에서는 알코올 안면홍조가 있는 음주 그룹에서의 청력손실 위험비가 그렇지 않은 음주 그룹보다 유의하게 높은 경향을 보였다.
결론
우리는 연구를 통해 남성 근로자들에서 중간 또는 대량 음주는 청력손실의 발생 위험을 높일 수 있고, 특히 알코올 안면홍조가 있는 남성 근로자들은 그 위험도가 더 증가함을 밝혀낼 수 있었다.

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Case Report

Four Cases of Abnormal Neuropsychological Findings in Children with High Blood Methylmercury Concentrations: Young-Seoub Hong, Dae-Seon Kim, Seung-Do Yu, Seong-Hwan Kim, Jong-Kuk Kim, Yu-Mi Kim, Jae-Ho Yu, Ji-Hyun Jung, Byoung-Gwon Kim; Ann Occup Environ Med 2013;25:18-18. Published online September 24, 2013; DOI: https://doi.org/10.1186/2052-4374-25-18

Abstract PDF PubReader ePub

Background

Methylmercury (MeHg) easily crosses the blood–brain barrier and accumulates in the brain. Accumulated MeHg will cause neurological symptoms. We report four pediatric cases of neuropsychological findings with high blood MeHg concentrations.

Case presentation

Four children were admitted for follow-up study because their total mercury (THg) concentration in the blood was found to be high during a national survey. Case 1 was a 9-year-old female with a 16.6 μg/ℓ blood THg concentration in the survey. During admission, the blood THg, hair THg, and blood MeHg concentration(mercury indices) were 21.4 μg/ℓ, 7.2 μg/g, and 20.1 μg/ℓ, respectively. In our neuropsychological examination, cognitive impairment and attention deficit were observed. Her diet included fish intake 2–3 times per week, and she had been diagnosed with epilepsy at 3 years of age. Case 2 was a 12-year-old male with blood THg of 15.4 μg/ℓ in the survey and the mercury indices were 12.7 μg/ℓ, 5.7 μg/g, and 11.8 μg/ℓ, respectively, on admission. He was also observed to have attention-deficit/hyperactivity disorder. Case 3 was a 10-year-old male child with blood THg of 17.4 μg/ℓ in the survey, and the mercury indices on admission were 21.6 μg/ℓ, 7.5 μg/g and 21.5 μg/ℓ, respectively. In his case, mild attention deficit was observed. Case 4 was a 9-year-old male with blood THg of 20.6 μg/ℓ in the survey and the mercury indices were 18.9 μg/ℓ, 8.3 μg/g, and 14.4 μg/ℓ, respectively, on admission. Mild attention difficulty was observed.

Conclusion

We suggest that fish consumption may be the main source of MeHg exposure, and that MeHg may have been the cause of the neuropsychological deficits in these cases.

Citations

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Original Article

The Effects of the Frequency of Fish Consumption on the Blood Mercury Levels in Koreans: Chan Woo Kim, Young Wook Kim, Chang Ho Chae, Jun Seok Son, Seung Hyun Park, Jae Chul Koh, Dae Seon Kim; Korean Journal of Occupational and Environmental Medicine 2010;22(2):114-121. Published online June 30, 2010; DOI: https://doi.org/10.35371/kjoem.2010.22.2.114

Abstract PDF

OBJECTIVE: We studied two districts in Korea in order to investigate if the frequency of fish consumption has an effect on the blood mercury levels.
METHODS
This survey was conducted on 164 fishing district residents in Geoje city and 219 agricultural district residents in Changwon city from July to August in 2008. The data on the demographic characteristics, the living environment, lifestyle habits and the frequency of fish consumption was collected by interviewers. We used ANOVA to estimate the particular relevance between the frequency of fish consumption and the blood mercury concentration, and other various factors.
RESULTS
The mean total blood mercury level was 6.54+/-4.01 microgram/L for the total study population. Our results were even higher than that of the National Health and Nutrition Examination Survey (USA) in, 2001~2002 and the German Environmental Survey in, 1998. In this study, there was a significant difference for the frequency of eating fish between the groups. (p<0.01, The level of the groups that ate fish 3 to 4 times per week was significantly higher as compared with the level of the other groups that ate fish 2 to 3 times per month and 1 to 2 times per week, respectively). As the frequency of fish consumption increased, so did the blood mercury concentration.
CONCLUSIONS
We found that the blood mercury concentration increases along with fish consumption and this was statistically significant and this fact reveals that fish consumption is positively related to the blood levels of mercury. Accordingly, we need systematic and periodic research on the general population to prevent mercury poisoning, which can be caused by low-level mercury exposure from dietary intake such as chronic fish consumption.

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Original Article

Mercury Concentration in air and in Urine of Workers in Fluorescent Lamp Manufacturing Factories in Korea: Kwang Jong Kim, Chul Whan Cha; Korean Journal of Occupational and Environmental Medicine 1990;2(2):179-185. Published online August 31, 1990; DOI: https://doi.org/10.35371/kjoem.1990.2.2.179

Abstract PDF: This research was conducted to investigate the correlations between urinary mercury concentration and each independent variable related with urinary mercury levels. the urinary mercury concentrations of 543 workers exposed to metal mercury vapor in a total of 11 fluorescent lamp manufacturing factories and at the same time mercury concentrations in air were measured from June 1989 to December 1989. And annually mercury consumption per workers, mercury consumption per lamp, numbers of breakage lamps, frequency of mercury infusion, numbers of droppers, and numbers of vacuum exhaustion pumps were also investigated. The results were as follows: 1. The geometric mean of airborne mercury concentration in a total of 11 factories was 47.9 microgram/m3 (5.8~352.2 microgram/m3), six factories(54.5%) of them were exceed the threshold limit value(50.0 microgram/m3). 2. The geometric mean of urinary mercury concentration among 543 workers was 84.3 microgram/l (1.13~533.9 microgram/l), the distribution of workers by urinary mercury concentration showed that 26 workers(4.8%) were above the mercury posioning level(300 microgram/l). 3. The correlation coefficient between urinary mercury concentration and monthly numbers of breakage lamps was the highest(0.74) and next was mercury consumption per lamp (0.67), annually mercury consumption per worker(0.63) in order.

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