Abstract | OBJECTIVE: METHODS: A population of 111 workers from 2 condenser plants (A and B) using epoxy resin with MTHPA underwent a questionnaire survey and serology investigations, and data obtained on 95 subjects in assembly and inspection lines were analyzed for this study. RESULTS: In all, 24 (65%) of 37 workers in plant A and 38 (66%) of 58 workers in plant B had positive MTHPA-specific IgE. The air levels of MTHPA detected in assembly and inspection lines were higher in plant A than in plant B (geometric mean 25.5-63.9 and 4.93-5.49 microg/m3, respectively). IgE-sensitized workers in each plant had significantly (P < 0.05) more complaints regarding the eyes and nose than did unsensitized workers, suggesting that there is an IgE-mediated mechanism in most of these symptoms. The sensitized workers in plant A had higher frequencies for symptoms of the eyes, nose, and pharynx than did those in plant B (P < 0.02). Furthermore, only 15% of persons often displayed work-related symptoms among the 20 symptomatic workers in plant B as compared with 73% of the 26 symptomatic workers in plant A (P < 0.0001). These results can be explained by the difference in the MTHPA levels measured in the lines between the two plants. In plant B the minimal level of MTHPA that was associated with work-related symptoms was 15-22 microg/m3, which was lower than the geometric mean levels detected in assembly and inspection lines in plant A. CONCLUSIONS: These results suggest that MTHPA exposure at levels above 15 microg/m3 should be avoided to prevent the development of occupational allergic diseases in most workers.
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Authors | K Yokota, Y Johyama, K Yamaguchi, T Takeshita, K Morimoto |
Journal | International archives of occupational and environmental health
(Int Arch Occup Environ Health)
Vol. 72
Issue 1
Pg. 14-8
(Jan 1999)
ISSN: 0340-0131 [Print] Germany |
PMID | 10029225
(Publication Type: Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't)
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Chemical References |
- Bronchoconstrictor Agents
- Epoxy Resins
- Phthalic Anhydrides
- methyltetrahydrophthalic anhydride
- Immunoglobulin E
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Topics |
- Adult
- Bronchoconstrictor Agents
(adverse effects)
- Case-Control Studies
- Conjunctivitis
(chemically induced)
- Dose-Response Relationship, Drug
- Epoxy Resins
(adverse effects)
- Female
- Humans
- Immunoglobulin E
(blood)
- Logistic Models
- Male
- Middle Aged
- Multivariate Analysis
- Occupational Exposure
(adverse effects, analysis)
- Phthalic Anhydrides
(adverse effects)
- Rhinitis
(chemically induced)
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