A follow-up study on the lung disorders of rush (igusa) farmers exposed to "sendo" dust.

Ueda, Atsushi; Futatsuka, Makoto; Ueda, Tomoyuki; Arimatsu, Yoshiki; Ueno, Tomomi; Nagano, Makoto; Nomura, Shigeru

doi:10.1539/joh1959.26.32

Cited by 4 publications

(11 citation statements)

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“…In the Japanese-language literature, it has been estimated that the incidence of pneumoconiosis in igusa mat workers is > 30%. It has been found that the workers tend to acquire a relatively early stage of pneumoconiosis after approximately 20 yr of dust exposure 1,2) . Yamawaki et al (1998) reported the prevalence of pneumoconiosis with category 1/0 or more was 19.6% for males and 34.6% for females, and found 4 cases (3 males, 1 female) with large opacities, those had 7) .…”

Section: Discussionmentioning

confidence: 99%

“…The workers are exposed to dense concentrations of sendo dust (50 to 100 mg/m 3 ) for 1 to 3 h/d in drying and storing, and continually exposed to low-density (1 to 5 mg/m 3 ) sendo dust during the weaving process and relatively dense concentrated dust (15 to 25 mg/m 3 ) in the tatami storing process 1) . In our study, some The upper respiratory tract is a remarkably efficient filter, removing upwards of 90% of particles > 7 pm in diameter 11) .…”

Section: Discussionmentioning

confidence: 99%

“…Dust samplings were collected by passive dust monitors according to the Chinese criteria method of dust measurement in the workplace (1). Total dusts were collected by ordinary dust sampler (total dust) (WUHANG Analytic Instrument Factory FC-2 dust sampler, China).…”

Section: Dust Samplingmentioning

confidence: 99%

“…In order to prevent the mat color from fading of the tatami mat color and to increase its strength, fresh reaped rush is smeared with mud [1][2][3] . During the process of drying, selection and weaving, workers are heavily exposed to the dust of dried mud.…”

Section: Introductionmentioning

confidence: 99%

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Lung Disorders of Workers Exposed to Rush Smear Dust in China

Xiao¹,

Morinaga

Wang

et al. 2006

Ind Health

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The aim of this study was to evaluate the lung disorders of the workers exposed to rush smear dust. A cross sectional study was carried out on 1,709 current workers (788 male, 921 female) in 80 factories. All subjects were asked by questionnaire, and health examination including chest Xray was conducted for 661 workers in 35 factories. Lung function test was also examined for 119 non-smoking males among 661 subjects. Dust samplings were collected and total and respirable dust concentrations at 127 spots in 35 factories were measured. The geometric mean dust concentration in the workshops was up to 20.00 mg/m 3 , and the geometric mean respirable dust concentration reached 8.22 mg/m 3 . The mean quartz concentration of accumulated dust was 29.2%. The prevalence of radiographic small opacities profusion category > or = 1/0, according to the ILO 1980 Classification System, was 2.6% among 661 employees. One worker was found to have pneumoconiotic findings of 2/2 profusion accompanied with large opacity. The prevalence of pneumoconiosis (1/0 or more) correlated with cumulative dust exposure (r=0.192, p<0.0001). The similar relationship was found between the prevalence rate of cough or sputa and worksite dust concentration. In non-smokers, a positive association was found between the prevalence of cough and occupational exposure duration (r=0.080, p=0.004). Approximately 19.3% and 34.5% of employees suffered from respiratory impairment for FVC and FEV1.0, respectively. This is the first report of "rush" pneumoconiosis in China. Rush mat workers were found to be at high risk for pneumoconiosis, a preventable disease. Our results showed a dose-response relationship between rush-mat dust level and the prevalence of pneumoconiosis. Similar relationship between the prevalence of cough and sputum and the work duration was found for non-smoking workers but not for smoking workers.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Dust Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lung Disorders of Workers Exposed to Rush Smear Dust in China

Xiao¹,

Morinaga

Wang

et al. 2006

Ind Health

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“…[1][2][3] Sendo dust contains 20 to 30% of free silica and therefore is a potential cause of pneumoconiosis. In recent years, igusa growth and tatami production has been extended to several other countries in Southeast Asia.…”

mentioning

confidence: 99%