摘要:

Many spirograms cannot be interpreted properly even when the technician is expert. The criteria of an interpretable spirogram are (1) full inspiration, (2) quick attainment of highest flow, (3) continuous decrease in flow with expiration, (4) smooth, gradual termination, and (5) expiration lasting three seconds or more. Violation of these criteria leads to “pseudo-obstruction” when expiration is not forceful, to “concealed obstruction” when the graphic record is started late and to two kinds of “pseudorestriction,” one due to inadequate inspiration and the other to premature termination of expiration. A “decision tree” for dealing with large volumes of spirometric data is presented.

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

The chelatable part of lead body burden was measured in 32 workers and seven office workers after an infusion test with CaNa2EDTA. The workers had been exposed to lead at a lead and zinc processing unit for one to three, years (mean one year). There was good correlation (r=0.87) between blood lead and chelatable urinary lead excretion described by the equation y = 0.07·100.46·x. From this equation it can be predicted that the generally accepted limit value for chelatable urinary lead excretion, 0.42 µmol/mmol CaNa2EDTA administered per 24 hours (3.1 µmol/24 hours or 650 µg/24 hours), corresponds to a blood lead concentration (PbB) of 1.7 µmol/l (or 35 µg/100 ml), which is lower than the commonly accepted limit value of 2.9 µmol/l (or 60 µg/100 ml) for occupationally lead-exposed persons. There was a better correlation between the chelatable lead excretion and the urinary ALA-excretion (r=0.45; p<0.001) than between PbB and the urinary ALA-excretion (r=0.26;p > 0.05).

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

A large-scale longitudinal study of working coal miners is analyzed to determine biases due to studying only working miners and only volunteers. Reports of symptoms, pulmonary function indices, and chest radiographs were obtained from the first round of the study and comparisons were made of the rates and means among those who participated in the second round, those who had left the industry before the second round, and those who simply did not participate in the second round. Biases were present in nearly all variables studied, but the biases were fairly small.

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

A patient with allergic alveolitis demonstrated by lung biopsy is described in a mushroom worker in Washington State presenting with severe airways obstruction. This is the first case of mushroom worker's lung reported in the United States outside the mushroom industry in Pennsylvania. The processes of commercial mushroom growing are discussed, and the literature on mushroom worker's lung is reviewed.

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0096-1736    

出版商:OVID    

年代:1981

数据来源: OVID