Persistent asthma due to isocyanates. A follow-up study of subjects with occupational asthma due to toluene diisocyanate (TDI)

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Am. Rev. Respir. Dis.; (United States)

DOI:https://doi.org/10.1164/ajrccm/137.6.1326· OSTI ID:6536061

Mapp, C E; Corona, P C; De Marzo, N; Fabbri, L

Thirty-five subjects with occupational asthma due to toluene diisocyanate (TDI) exposure were examined. All the subjects were studied with inhalation challenges with TDI and with methacholine. TDI asthma was documented by a positive inhalation challenge to low levels of TDI. Airway responsiveness to methacholine was in the range of asthmatic patients at the time of diagnosis. After an average follow-up interval of 10 months, all the subjects were re-examined. Of the 35 subjects examined, 30 subjects (85.7%) left the workplace, and 5 remained in the same job. Twenty-seven subjects (77.1%) continued to have asthmatic attacks requiring medication for relief of symptoms. At follow-up examination, TDI asthma was documented by a positive inhalation challenge to TDI in 27 subjects. Of these 27 TDI reactors, 22 subjects were removed from occupational exposure to TDI. The TDI reactors had persistent respiratory symptoms and airway hyperresponsiveness to methacholine. At follow-up visit, 8 subjects (22.9%) lost sensitization to TDI; 5 subjects (62.5%) in this group had also normal airway responsiveness to methacholine after removal from exposure. Only 1 subject among the TDI nonreactors complained of mild respiratory symptoms. At diagnosis, there were no significant differences between subjects who recovered and those who did not with regard to age, smoking habits, atopy, duration of exposure to isocyanates, duration of symptoms, baseline FEV1 (% pred), and baseline airway responsiveness to methacholine.

• Research Organization: Univ. of Padova (Italy)
• OSTI ID: 6536061
• Journal Information: Am. Rev. Respir. Dis.; (United States), Journal Name: Am. Rev. Respir. Dis.; (United States) Vol. 137:6; ISSN ARDSB
• Country of Publication: United States
• Language: English

Related Subjects

550900 -- Pathology
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ASTHMA
CARBONIC ACID DERIVATIVES
CYANATES
DISEASES
EPIDEMIOLOGY
INHALATION
INTAKE
NITROGEN COMPOUNDS
OCCUPATIONAL EXPOSURE
ORGANIC COMPOUNDS
PERSONNEL
RESPIRATORY SYSTEM DISEASES
TOXICITY