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Occupational asthma

S M Brooks1

  • 1Department of Environmental and Occupational Health, College of Public Health, University of South Florida, Tampa 33612, USA.

Toxicology Letters
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

Occupational asthma, a significant respiratory condition, presents in two main types: allergic with latency and irritant-induced without latency. Prevention strategies focus on exposure reduction and medical surveillance.

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Area of Science:

  • Occupational Medicine
  • Respiratory Medicine
  • Immunology

Background:

  • Occupational asthma is a major cause of respiratory illness, disability, and work-related cases.
  • It is classified into two types based on the onset of symptoms relative to workplace exposure.
  • Understanding these classifications is crucial for effective diagnosis and management.

Purpose of the Study:

  • To differentiate between occupational asthma with latency (allergic) and without latency (e.g., Reactive Airways Dysfunction Syndrome).
  • To explore the various factors influencing the development of occupational asthma.
  • To highlight essential preventive measures and the role of medical surveillance.

Main Methods:

  • Classification of occupational asthma based on temporal relationship to exposure.

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  • Identification of biochemical and physiological markers for allergic occupational asthma.
  • Characterization of Reactive Airways Dysfunction Syndrome (RADS) as a non-latent form.
  • Review of etiological factors including exposure, industrial, and host conditions.

    • Main Results:

    • Occupational asthma with latency involves sensitization after a latent period, showing immunologic alterations and airway hyperresponsiveness.
    • Occupational asthma without latency, like RADS, occurs suddenly after high-level irritant exposure, leading to chronic nonspecific airway hyperresponsiveness.
    • Prolonged irritant exposure in susceptible individuals can also trigger new-onset asthma.
    • Key influencing factors include exposure characteristics, industrial and job attributes, environmental conditions, and personal factors like atopy and smoking.

    Conclusions:

    • Effective prevention requires controlling workplace exposures through engineering controls, ventilation, and accident prevention.
    • Medical surveillance is vital for identifying at-risk individuals and enabling early intervention.
    • Complete removal from the workplace is the most effective preventive measure for sensitized workers.