Pulmonary Asbestosis In A Dog

Our plain-English summary of Pulmonary Asbestosis In A Dog, by N.H. Schuster (1931).

The study

• Author: N.H. Schuster
• Published: Journal Of Pathology And Bacteriology 34:751-767 (1931)
• Type of article: Journal article
• Our copy: from Johns-Manville's own medical library, J-M no. 003232. The article is still under copyright, so we describe it here rather than post it.

In plain English

This article was a case report on the lungs of one dog. The dog, a 10-year-old rough-haired terrier kept for ratting, had lived nearly all its life in an asbestos factory where white, blue and brown asbestos were all used. The author stated it was impossible to attribute its condition to any one of these. The dog had a cough and breathlessness for two years and progressive wasting for six months, and was destroyed. The visceral pleura was opaque with patches of thickening, and there was diffuse fibrosis under the pleura. Under the microscope there was increased interstitial tissue, dilated bronchioles, and asbestos fibres in large numbers in all parts of the lung. No asbestos bodies were found in several sections examined, and there was no evidence of septic infection. The author concluded that the dog showed uncomplicated asbestosis. As far as one case allowed, the absence of asbestos bodies did not seem to alter the course of the disease. The fibrosis was probably due to a toxic action of the silicate rather than mechanical injury. The author noted the dog was not an experimental animal, because its inhalation conditions and illness were not precisely known.

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: Case report: pathological examination of the thoracic organs of one dog after death
• Who was studied: One 10-year-old rough-haired terrier kept for ratting, which had lived nearly all its life in an asbestos factory (factory location not stated)
• Exposure: Asbestos dust in the factory where the dog lived, about ten years in all; white, blue and brown asbestos were all used, and the author could not attribute the condition to any one type
• Main results:
  • The dog had cough and breathlessness for two years and progressive wasting for six months, and was destroyed because the breathlessness became so distressing
  • The visceral pleura showed general opacity with several patches of localised thickening
  • On cutting the lungs there was diffuse fibrosis under the pleura
  • Under the microscope there were numerous asbestos spicules, mostly in the interstitial tissue, along with dilated bronchioles
  • Asbestos fibres were present in large numbers in all parts of the lung, and a few spicules were found in a tracheo-bronchial gland
  • No asbestos bodies were found in several sections
  • There was no evidence of septic infection of the lung
  • A pathologist who examined the organs considered that there was no hypertrophy of the heart
• The authors' conclusion: The author concluded that the dog's lungs were a specimen of uncomplicated asbestosis. So far as a single case allowed, the absence of asbestos bodies did not alter the course of the disease. The fibrosis was probably a result of the toxic action of the silicate, not a mechanical effect.
• Limitations the authors state:
  • The dog cannot be considered an experimental animal, because neither the inhalation conditions nor the details of its illness were precisely known
  • Several asbestos types were used in the factory, so the condition could not be attributed to any one of them
  • The absence of asbestos bodies might have been due to a peculiarity of dogs, of rough-haired terriers, or of this particular animal

Topics

Medical terms in this study, explained in our Lexicon: Asbestosis, Visceral Pleura, Fibrosis, Pleura, Interstitial, Asbestos Bodies, Silicate.

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