What are the features asthma types associated with occupational factors?

Updated: Nov 20, 2020
  • Author: Michael J Morris, MD, FACP, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Two types of occupational asthma are recognized: immune-related and non-immune-related. Immune-mediated asthma has a latency of months to years after exposure. Non-immune-mediated asthma, or irritant-induced asthma (reactive airway dysfunction syndrome), has no latency period and may occur within 24 hours after an accidental exposure to high concentrations of respiratory irritants. Pay careful attention to the patient's occupational history. Those with a history of asthma who report worsening of symptoms during the week and improvement during the weekends should be evaluated for occupational exposure. Peak-flow monitoring during work (optimally, at least 4 times a day) for at least 2 weeks and a similar period away from work is one recommended method to establish the diagnosis. [15]

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