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Related Experiment Videos

Closed-circuit methodology for inhalation challenge tests with isocyanates.

O Vandenplas1, J L Malo, A Cartier

  • 1Department of Chest Medicine, Sacré-Coeur Hospital, Montreal, Quebec, Canada.

The American Review of Respiratory Disease
|March 1, 1992
PubMed
Summary

A new closed-circuit apparatus offers a more stable and safer method for diagnosing isocyanate-induced asthma. This improved technique reduces exposure risks compared to traditional challenge room methods.

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Area of Science:

  • Occupational Medicine
  • Pulmonology
  • Environmental Health

Background:

  • Isocyanate-induced asthma diagnosis relies on challenge tests.
  • Traditional challenge rooms have unstable isocyanate levels, risking irritant reactions.
  • Exceeding the TLV ceiling of 20 ppb is a significant concern.

Purpose of the Study:

  • To develop and assess a novel closed-circuit apparatus for generating isocyanates.
  • To compare the stability and safety of the new apparatus against the small challenge room method.
  • To evaluate diagnostic accuracy for isocyanate-induced asthma.

Main Methods:

  • A closed-circuit apparatus was developed for controlled isocyanate gas generation.
  • Twenty subjects with suspected isocyanate-induced asthma were tested.

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  • A randomized sequential comparison of the new method and the small challenge room method was performed.

    • Main Results:

    • The closed-circuit apparatus demonstrated significantly more stable isocyanate concentrations (variance 6.3 vs. 61.8).
    • Exposure time above 20 ppb was reduced from 11.3% to 4.5% with the new method.
    • Both methods showed similar diagnostic outcomes, though one subject reacted only to the challenge room method.

    Conclusions:

    • The closed-circuit apparatus provides a more stable and controlled environment for isocyanate exposure.
    • This method mitigates risks associated with unstable concentrations and exceeding safe limits.
    • The new apparatus is a promising alternative for diagnosing occupational asthma.