Asbestos

The use of asbestos in industry today is far less than in decades past. Present-day application or removal (abatement) of asbestos is restricted to certified companies and their employees. Exposure can also occur in the construction trades such as plumbing, electrical, and heating/ventilation during the maintenance of older industrial structures containing asbestos.

Chronic inhalation of friable, airborne asbestos fibers can cause pleural plaques, asbestos, and restrictive lung disease. Symptom questionnaires, physical examination, standard chest x-rays, and lung function tests are used to screen for these diseases. High-resolution chest CT scans can detect asbestos at an earlier stage, but cost, availability, and radiation exposure have limited their use to confirmatory (diagnostic) testing.
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When a worker’s cumulative (life-time) exposure to asbestos fibers exceeds xxxx fibers/m3-years, screening for these diseases becomes feasible. Key challenges include:

* accurate estimation of a worker’s historical exposure to asbestos
* risk communication and informed consent
* quality and interpretation of chest x-rays
* quality and reliability of lung function testing
* interpretation of longitudinal lung function testing.
* referral for diagnostic testing and medical management
* determining when exposure (work) restrictions are warranted
* secure long-term retention of medical records 
Reference Article
Hodgson JT and Darnton A. The Quantitative Risks of Mesothelioma and Lung Cancer in Relation
to Asbestos Exposure. Ann. occup. Hyg. (2000) 44; 8, 565–601.

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