Clinical and histopathological changes of the nasal mucosa induced by occupational exposure to sulphuric acid mists

Clinical and histopathological changes of the nasal mucosa induced by occupational exposure to sulphuric acid mists

Author Grasel, S. S. Google Scholar
Alves, VAF Google Scholar
Silva, C. S. da Google Scholar
Cruz, OLM Autor UNIFESP Google Scholar
Almeida, E. R. Google Scholar
Oliveira, E. de Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Aims: To assess potential alterations of the nasal mucosa by clinical and histopathological evaluation of workers exposed to sulphuric acid mists at anodising plants, correlating the findings with duration of exposure and sulphuric acid concentrations in the air, and comparing them with a control group.Methods: Fifty two workers from five plants underwent a clinical evaluation (standard questionnaire, clinical, and ear, nose, and throat examination including nasal endoscopy). for the histopathological study, 20 of the 52 subjects (study group) were randomly selected, as well as 11 unexposed subjects (control group), matched by sex, age, and smoking habits. Nasal biopsy specimens were obtained from the anterior septum mucosa and the anterior curvature of the middle turbinate in each individual. A total of 56 nasal mucosa specimens (37 in the study group and 19 in the control group) were evaluated with regard to normal respiratory epithelium or metaplastic epithelium, atypia or dysplasia, and. alterations of the lamina propria.Results: the histopathological study revealed squamous metaplasia in 29 (79%) and atypia in 13 (35%) of the 37 study group samples. No association was found between exposure duration and the clinical and histopathological variables, but a significant association was found between sulphuric acid concentrations higher than 200 mug/m(3) and pale mucosal patches and ulcerations in the exposed subjects. Logistic regression analysis showed that the exposed subjects had a fivefold risk of developing exposed subjects had a fivefold risk of developing atypia compared with the unexposed subjects.Conclusions: Workers exposed to sulphuric acid mists presented with a high incidence of nasal symptoms, and macroscopic and microscopic changes of the nasal mucosa, including squamous atypia and dysplasia. the risk for these histopthological lesions increased with higher sulphuric acid concentrations in the air, revealing an exposure-response relation.
Language English
Date 2003-06-01
Published in Occupational and Environmental Medicine. London: British Med Journal Publ Group, v. 60, n. 6, p. 395-402, 2003.
ISSN 1351-0711 (Sherpa/Romeo, impact factor)
Publisher British Med Journal Publ Group
Extent 395-402
Origin http://dx.doi.org/10.1136/oem.60.6.395
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000183149900003
URI http://repositorio.unifesp.br/handle/11600/27263

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