Abstract

obstruction (reduced FEF25-75 and FEF75-85) as shown in 8,720 asbestos-exposed workers who at various times during this evolution show irregular opacities as seen in the chest x-ray films.1 Thus, the disease's functional signs precede the radiographic manifestations. This was confirmed pathologically as fibrosis was found far more often on tissue sections when lung was examined from asbestos workers with lung cancer.2 These studies since have been replicated in over 8,000 additional workers. We studied,

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