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Persistent airways disease caused by toluene diisocyanate
The American Review of Respiratory Disease
|July 1, 1986
Summary
Toluene diisocyanate (TDI) can cause persistent asthma symptoms even years after exposure ends. Some individuals do not recover from TDI-induced asthma after removal from occupational exposure.
Area of Science:
- Occupational Medicine
- Pulmonology
- Toxicology
Background:
- Isocyanate-induced asthma is a significant occupational respiratory disease.
- The long-term prognosis and natural history of toluene diisocyanate (TDI) asthma remain poorly understood.
- Assessing persistent respiratory symptoms after cessation of isocyanate exposure is crucial.
Observation:
- A patient experienced persistent asthma symptoms, including shortness of breath, wheezing, and cough, following massive toluene diisocyanate (TDI) exposure.
- Asthma symptoms and variable airway obstruction persisted for 12 years despite no further occupational isocyanate exposure.
- Diagnostic tests revealed a markedly positive methacholine inhalation challenge and a dual asthmatic response to a bronchial challenge with TDI.
Findings:
- Toluene diisocyanate (TDI) sensitivity can remain for many years without ongoing occupational exposure.
- A significant subset of patients with TDI-induced asthma may not recover even after removal from isocyanate exposure.
- This case highlights the potential for chronic, persistent respiratory impairment following isocyanate sensitization.
Implications:
- Clinicians should consider long-term monitoring for patients with suspected isocyanate-induced asthma.
- The findings suggest a need for improved prevention strategies and awareness of the chronic nature of TDI asthma.
- Further research into the mechanisms of persistent airway hyperresponsiveness in TDI-sensitized individuals is warranted.