Pneumonoconiosis Part III Pulmonary Asbestosis

Our plain-English summary of Pneumonoconiosis Part III Pulmonary Asbestosis, by P. Ellman (1934).

The study

• Author: P. Ellman
• Published: British Journal of Radiology, Volume 7 No2. January 19th 1934
• Type of article: Journal article
• Our copy: from Johns-Manville's own medical library. The article is still under copyright, so we describe it here rather than post it.

In plain English

This 1934 article by P. Ellman was a discussion contribution on the pneumonoconioses, not a formal study. The author reviewed earlier reports, described X-ray and pathological features from the author's cases and others' work, presented two cases, and discussed prognosis. The author described the X-ray picture as fine diffuse fibrosis beginning at the lung bases, though other dusts might look the same. Asbestosis bodies in sputum were said to show only exposure to asbestos dust, not disease. Bodies in radially arranged clumps in sputum were taken to indicate breakdown of lung tissue from broncho-pneumonia or secondary tuberculous infection. A dog kept in an asbestos factory showed diffuse lung fibrosis but no asbestosis bodies. Both patients had asbestosis and later had tubercle bacilli found in their sputum. One was a woman aged 35 who had worked in an asbestos factory from 1916 to 1921. The author wrote that limited personal experience tended to show tuberculosis was not uncommon in asbestosis, that whether the risk equalled that in silicosis was uncertain, and that people with tuberculosis should be kept out of the industry.

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: Narrative discussion paper reviewing knowledge of pulmonary asbestosis. It includes observations from the author's own cases and from other researchers, one dog, two case reports, and a section on prognosis.
• Who was studied: The author's own patients with pulmonary asbestosis, from a smaller series whose number is not legible, two of them described in detail. Case 1 was a woman aged 35 who had worked in an asbestos factory. Case 2 was described as originally pure pulmonary asbestosis; that patient's age, sex and work history are lost in the scanned text. A dog that had lived at an asbestos factory was also examined.
• Exposure: Inhalation of asbestos dust in asbestos factory work. No fiber type (such as chrysotile or crocidolite) is named.
• Main results:
  • In the author's account, X-rays and clinical findings showed a fine diffuse fibrosis starting at, and mainly involving, the bases of the lungs, with all zones involved in advanced cases.
  • Asbestosis bodies in sputum were said to indicate only exposure to asbestos dust. On their own they did not justify a diagnosis of pulmonary asbestosis.
  • Asbestosis bodies occurring in radially arranged clumps in sputum were taken to indicate disintegration of lung tissue, from broncho-pneumonia or secondary tuberculous infection.
  • The dog had chronic diffuse interstitial lung fibrosis with dilated bronchioles, but no asbestosis bodies and no sign of acute inflammation.
  • Case 1 showed advanced asbestosis with a suspected superadded tuberculous infection. A later footnote reported that tubercle bacilli had been found in the sputum.
  • Case 2 was originally pure pulmonary asbestosis and was later complicated by tuberculosis. Tubercle bacilli were found in the sputum in October 1932.
  • In the prognosis section, citing data from fatal cases reported by the Chief Inspector of Factories for 1931, the author stated that the time from exposure to death in asbestosis was only half that in silicosis. The table's figures are too damaged in the scan to report.
• The authors' conclusion: The author wrote that limited personal experience tended to show that tuberculosis, as a complication of asbestosis, is not uncommon. The author could not say whether the risk equals, or even exceeds, that in silicosis, but considered the existence of a risk established. In the author's view, people with tuberculosis should not enter or remain in the asbestos industry.
• Limitations the authors state:
  • The author noted that other dusts able to cause lung fibrosis might produce an X-ray picture indistinguishable from asbestosis.
  • The author described the conclusions on tuberculosis as based on the author's own limited experience. The author also said it could not be determined whether the risk equalled that in silicosis.

Topics

Medical terms in this study, explained in our Lexicon: Asbestosis, Prognosis, Fibrosis, Sputum, Silicosis.

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