Detection of asbestos fibres by dark ground microscopy

Our plain-English summary of Detection of asbestos fibres by dark ground microscopy, by K.R. James, T.B. Bull, B. Fox (Journal of Clinical Pathology, 1987).

The study

• Authors: K.R. James, T.B. Bull, B. Fox
• Journal: Journal of Clinical Pathology
• Published: 1987;40(10):1259-60
• Cited by: 1 article, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

In plain English

This short technical note described a laboratory method for finding and counting asbestos fibres in human lung tissue using dark ground illumination, a microscope lighting technique, as an alternative to the more commonly used phase-contrast microscopy. It reported no patients, case counts or measured fibre levels, and it did not name specific fibre types. In the method, a piece of lung about 1 cubic centimetre was weighed and dissolved in 5% sodium hydroxide at 60°C for 24 hours. The remaining material was washed, dried onto a slide and examined. Fibres counted on the slide, the volume of suspension used and the tissue weight were used to express results as fibres per gram of tissue. Under dark ground illumination, both coated and uncoated fibres appeared bright against a dark background. They could also be seen in unstained and Perls's-stained paraffin sections. The authors reported that over three years the method gave similar results to phase-contrast microscopy. They said its equipment was cheaper, simpler to set up and use, and much less tiring for counting. The authors concluded that the method had distinct advantages over phase-contrast microscopy.

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: Technical methods note describing a laboratory technique (no study population or statistical comparison reported)
• Who was studied: Human lung tissue samples (about 1 cm3 each), digested in 5% aqueous sodium hydroxide; work done in the Department of Histopathology, Charing Cross and Westminster Medical Schools, London; number of specimens not stated
• Exposure: Asbestos fibres in lung tissue, both coated and uncoated; no fibre types (such as chrysotile or amphiboles) are named
• Main results:
  • Under dark ground illumination, both coated and uncoated fibres appeared bright and shining against a dark background
  • Fibre counts were expressed as fibres per gram of tissue, calculated from the fibres counted on the slide, the volume of suspension on the slide (from an original 1 ml) and the weight of tissue digested
  • Over three years of use, the authors found dark ground illumination gave similar results to phase-contrast microscopy (no figures given)
  • The authors reported three advantages: cheaper equipment, simpler setup and use, and much less tiring fibre counting
  • Coated and uncoated fibres could also be seen in unstained and Perls's-stained paraffin sections using dark ground illumination
  • The authors found the tissue preparation suitable for electron microscopy and electron microprobe analysis
• The authors' conclusion: The authors concluded that the dark ground illumination method has distinct advantages over the phase-contrast method

Topics

The National Library of Medicine indexes this study under subjects our site covers: Asbestosis.

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