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Airways Obstruction From Asbestos Exposure: History
One medical team gave questionnaires to these workers and did chest physical examinations, chest radiographs, spirometry, and measured alveolar carbon monoxide to validate smoking histories. The questionnaire was completed by trained interviewers. Occupational history included proximity to and duration of exposure to asbestos, medical, pulmonary, and cardiovascular histories, including criteria to define chronic bronchitis and […]
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Airways Obstruction From Asbestos Exposure: Methods
The men with asbestosis and the age-matched asbestos-exposed comparison men were from 8,720 workers studied at 47 sites across the United States from California to Florida. The asbestos exposed men (ILO profusion 0/0 and 0/1) were individually matched for age to men with asbestosis (ILO profusion 1 /0 to 3/3) in each smoking category using […]
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Airways Obstruction From Asbestos Exposure: Data
Another possibility, that volume has been replaced by fibrosis in normal-sized lungs, would increase the postmortem weight of lungs. Weight is not increased in asbestosis nor are alveoli filled by nonradiodense material as in alveolar lipoproteinosis. Alternately there would be “apparent restrictive impairment” if obstruction continued through advancement of asbestosis causing air trapping and progressive […]
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Airways Obstruction From Asbestos Exposure
Workers with clinical asbestosis have been characterized as having “restrictive” disease because of reduced vital capacity (VC) and in some cases reduced total lung capacity (TLC). This is thought to occur despite airway obstruction and increased TLC due to cigarette smoking. The TLC was decreased when functional residual capacities (FRC) were measured by gas dilution […]
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Bronchial Responsiveness in Children Exposed to Atmospheric Pollution in Hong Kong: Conclusion
Other factors that may have accounted for the differences between districts include the variation in respiratory symptoms in the two groups of children. Our subsets sampled for histamine were comparable, and only one of the 13 symptoms, wheezing, was significantly higher in the KDT sample. A history of asthma and wheezing was associated with increased […]
Bronchial Responsiveness in Children Exposed to Atmospheric Pollution in Hong Kong: Discussion
The crude prevalence of BHR was 25.5 percent (95 percent CI=21.4 to 29.7 percent). A comparison of the distribution of BHR, categorized by degree of severity between the two districts, is shown in Table 4. There was a higher prevalence of BHR in children from KDT (x2=7.74, df=3, p=0.052) mainly attributable to more mild hyperreactivity […]
Bronchial Responsiveness in Children Exposed to Atmospheric Pollution in Hong Kong: Results
The mean (minimum and maximum) levels of SO2, NO2, RSP, and TSP (/лg/m) in ambient air in the two districts for the year 1989 to 1990 (September to June) as measured from fixed air monitoring stations situated in the two districts were as follows: Kwai Tsing Southern S02 117(72,177) 9( 4,16) N02 40(31, 49) 21(15,26) […]