Respiratory illness in asbestos contaminated sites: the role of environmental exposure

Our plain-English summary of Respiratory illness in asbestos contaminated sites: the role of environmental exposure, by P. Comba, L. Fazzo, A. Zona (The European Respiratory Journal, 2011).

The study

• Authors: P. Comba, L. Fazzo, A. Zona
• Journal: The European Respiratory Journal
• Published: 2011;38(2):248-50
• Type of article: Comment, Editorial
• Cited by: 4 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Summary of the article

This editorial commented on a study by Weill et al., published in the same issue of the European Respiratory Journal, of lung function and radiological changes in relation to exposure to tremolite-contaminated vermiculite in Libby, Montana, USA. The authors first summarised literature on environmental asbestos exposure, including tremolite-related mesothelioma and pleural plaques from soil contamination in several countries, and studies of Libby workers, household contacts and residents. Weill et al. had used data from a 2000 survey of 7,307 current or former residents by the Agency for Toxic Substances and Disease Registry (ATSDR). They restricted the analysis to 4,524 subjects aged 25-90 years who had no asbestos exposure other than through vermiculite. They reported that pleural plaques increased with age and were less common with environmental than occupational exposure. Plaques had a significant effect on forced vital capacity in males. Pleural abnormalities were less prevalent in the general population exposed after 1976. The editorial authors argued that exposure categories should consider distance from fibre sources and duration of residence. They said mesothelioma data were available, citing nine Libby cases diagnosed between 1993 and 2006 that were associated with environmental exposure. They also noted the lack of carbon monoxide diffusion testing, and that ATSDR had found moderate-to-severe restriction in 1.8% of those tested. They concluded that the findings supported reduced risk after 1976 mitigation but could not rule out adverse respiratory effects. They suggested that pleural mesothelioma monitoring might be informative.

PubMed has no abstract for this study, and the article doesn't print one. We wrote this summary from the full article with the help of AI. It is not the authors' wording.

In plain English

This article was an editorial, not an original study. The authors, from the Istituto Superiore di Sanità in Rome, commented on a study by Weill and colleagues published in the same journal issue. That study analysed survey data from the US Agency for Toxic Substances and Disease Registry (ATSDR) on people from Libby, Montana, USA, where vermiculite was contaminated by tremolite and other amphibole fibres (winchite and richterite). As the editorial described it, the study included 4,524 residents or former residents aged 25 to 90 who had no asbestos exposure other than through vermiculite. It found that pleural plaques became more common with age and were less common in people with environmental exposure than in workers. In the general population exposed after 1976, plaques and certain other pleural changes were less common. The editorial authors questioned how people were assigned to exposure groups. They disputed Weill and colleagues' statement that mesothelioma mortality was difficult to assess. They also noted that carbon monoxide lung diffusion testing, generally recommended for asbestos-exposed people, was not available. The authors concluded that the study supported a reduction in health risks after the 1976 mitigation. They added that the data were not sufficient to rule out harmful respiratory effects of environmental exposure, and suggested that monitoring pleural mesothelioma could help.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Editorial commenting on another study (Weill et al.) published in the same journal issue; no original data
• Who was studied: No population of its own. The editorial discusses Weill et al.'s analysis of 4,524 Libby, Montana residents or former residents aged 25 to 90. They were drawn from a 2000 ATSDR survey of 7,307 people, had no asbestos exposure other than through vermiculite, and had radiological and spirometry data.
• Exposure: Environmental and occupational exposure to Libby vermiculite contaminated with tremolite and other amphibole fibres (winchite and richterite)
• Main results:
  • As reported by the editorial, Weill et al. found that pleural plaque prevalence rose with age and was lower in people with environmental exposure than in workers. They also found a significant effect of pleural plaques on forced vital capacity in males.
  • As reported by the editorial, Weill et al. documented lower prevalence of pleural plaques, diffuse pleural thickening and costophrenic angle obliteration in the general population exposed after 1976.
  • The editorial authors argued that assigning people to exposure groups should also consider indicators such as the distance of their home from the mine.
  • The editorial authors disputed Weill et al.'s statement that mesothelioma mortality was difficult to assess. They cited a 2008 report of nine mesothelioma cases diagnosed in Libby between 1993 and 2006 that were associated with environmental exposure.
  • The editorial authors noted that only spirometry data were available, while carbon monoxide lung diffusion testing is generally recommended for asbestos-exposed people.
• The authors' conclusion: The authors concluded that Weill et al.'s evidence supports a reduction in health risks for Libby residents after the 1976 mitigation. They judged the data insufficient to rule out adverse respiratory effects of environmental exposure, because of limitations in exposure categorisation and the lack of carbon monoxide diffusion testing. They suggested that pleural mesothelioma monitoring might be informative.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Talc and vermiculite.

Medical terms in this study, explained in our Lexicon: Environmental Exposure, Tremolite, vermiculite, Asbestos Exposure, Mesothelioma, Pleural Plaques, ATSDR, Occupational Exposure.

Related studies

• Electronic Nose Technology in Respiratory Diseases — S. Dragonieri, G. Pennazza, et al. (2017)
• A review of the federal government's health activities in response to asbestos-contaminated ore found in Libby, Montana — K. Horton, V. Kapil, et al. (2006)
• Exposure to asbestos-containing vermiculite ore and respiratory symptoms among individuals who were children while the mine was active in Libby, Montana — L.C. Vinikoor, T.C. Larson, et al. (2010)
• Environmental asbestos exposure and mesothelioma cases in Bari, Apulia region, southern Italy: a national interest site for land reclamation — L. Vimercati, D. Cavone, et al. (2018)
• Environmental Health Education for Asbestos-Contaminated Communities in Italy: The Casale Monferrato Case Study — D. Marsili, A. Canepa, et al. (2019)
• Psychological Distress after a Diagnosis of Malignant Mesothelioma in a Group of Patients and Caregivers at the National Priority Contaminated Site of Casale Monferrato — M. Bonafede, A. Granieri, et al. (2020)

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