Chest
Volume 123, Issue 6, June 2003, Pages 2124-2129
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Occupational and Environmental Lung Disease
Occupational Asthma Due to Persulfate Saltsa: Diagnosis and Follow-up

https://doi.org/10.1378/chest.123.6.2124Get rights and content

Background

Persulfate salts have been identified as a cause of occupational asthma (OA). The aim of the present study was to describe the clinical characteristics, diagnostic testing results, and follow-up of eight patients with OA that was triggered by these chemical compounds.

Methods

Eight patients with OA due to exposure to persulfate salts were studied. Immunologic, lung function, and specific bronchial challenge tests (SBCTs) were performed in all patients. Once their condition had been diagnosed, the patients were seen every 1, 3, and 6 months for a mean duration of 18 months.

Results

The mean time of exposure to persulfate salts up to diagnosis was 15 years (range, 3 to 27 years), and mean time that had elapsed between symptom onset and diagnosis was 38 months (range, 3 to 120 months). Three patients were smokers, six patients presented with rhinitis prior to asthma in relation to persulfate exposure, and three presented with dermatitis. The results of total IgE tests were positive in six patients, and the results of skin-prick tests for detection of persulfate salts were positive in five of these patients. The results of a SBCT was positive in the seven patients in whom it was performed. Symptoms persisted in all but one patient and required medical treatment.

Conclusions

The results suggest that the reliable diagnosis of OA due to persulfate salts must be based on the specific challenge test until further experience has been acquired. Despite avoiding exposure, patients continued with symptoms and required treatment for the control of symptoms. Finally, a dependent IgE mechanism appears to be implicated in the pathogenesis of OA due to exposure to persulfate salts.

Section snippets

Study Population

Eight women (mean age, 35 years; range, 23 to 46 years), the total number of patients in whom asthma due to persulfate salts had been diagnosed at our occupational respiratory disease unit between 1997 and 2001, were prospectively studied. Three patients were employed in a cosmetic product factory where they mixed persulfate salts with other chemical agents to produce hair bleaches. Five patients worked with dyes in hairdressing salons. In the latter cases, the hair bleaches containing

Clinical Characteristics

Clinical characteristics of the patients are shown in Table 1. The mean time of contact with persulfate salts prior to diagnosis was 15 years (range, 3 to 27 years), and the mean time elapsed between symptom onset and diagnosis was 38 months (range, 3 to 120 months). All patients developed cough, chest tightness, and wheezing, and initially presented symptoms after work and at night, except patient 7 whose symptoms had occurred during work from the beginning of onset. Symptoms later worsened,

Discussion

From the small proportion of exposed workers who develop OA due to persulfate salts,678the latent period between onset of exposure and the onset of symptoms, and the type of response observed in the challenge test suggest that persulfate-induced OA is mediated by an immunologic mechanism. The results obtained in the present study suggest that this immunologic mechanism might be mediated by IgE, since a skin-prick test that is positive for persulfate salts had been obtained in five patients

Acknowledgment

The authors are grateful to Christine O’Hara for her help with the English translation of the article, to Teresa Codinach, a member of the nursing staff, and to Rosa Lloria for editorial assistance.

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