Inorganic particles in bronchoalveolar lavage fluids from nonoccupationally exposed subjects

Our plain-English summary of Inorganic particles in bronchoalveolar lavage fluids from nonoccupationally exposed subjects, by M. Falchi, L. Biondo, C. Conti, et al (Archives of Environmental Health, 1996).

The study

• Authors: M. Falchi, L. Biondo, C. Conti, A. Cipri, F. de Marinis, B. Gigli, L. Paoletti
• Journal: Archives of Environmental Health
• Published: 1996;51(2):157-61
• Cited by: 10 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

This study comprised 30 patients who had not been exposed occupationally to dusts, but for whom a diagnosis of suspected pulmonary carcinoma had been made. Bronchoalveolar lavage fluids from these patients were analyzed by transmission electron microscopy and by energy-dispersive x-ray microanalysis in an effort to study the mineral particulate present in the alveolar region. Particles of silica, silicates, oxides, sulphates, and metal alloys were detected in various percentages in each subject. The smoking habits of two groups of patients that were defined by their bronchoalveolar lavage particulate concentrations (i.e., lower or higher than the median of the distribution) differed significantly.

In plain English

This study used electron microscopy to examine mineral particles in fluid washed from the lungs (bronchoalveolar lavage fluid) of 30 patients with suspected lung cancer at a hospital in Rome, Italy. The authors described these patients as not occupationally exposed to dust. Particle concentrations ranged from 0.08 to 1.28 × 10^5 particles per ml, with an estimated error of about 20%. About 42% of particles were silicates and silica, and about 58% were metal compounds. Asbestos fibers were found in 40% of patients, at about 60 to more than 1,200 fibers per ml. Only chrysotile was detected. Patients with particle concentrations above the median had smoked significantly more (average 25.2 versus 14.4 pack-years) and had significantly larger metal-compound particles. Asbestos was found in 7 patients above the median and 5 below, with asbestos burdens of 470 versus 130 fibers per ml. The authors concluded that lavage fluid particles were a very useful tool for characterizing exposure to breathable dust, and suggested smoking may affect lung clearance. They noted that particle losses during processing could have caused underestimation.

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: Descriptive laboratory analysis of lung lavage fluid samples from a group of hospital patients, using transmission electron microscopy with x-ray microanalysis, plus a statistical comparison of patients above and below the median particle concentration
• Who was studied: 30 patients with suspected lung cancer admitted to the Pneumologic Hospital "C. Forlanini" in Rome, Italy. The authors described them as not occupationally exposed to dust. The article does not state the dates of sampling.
• Exposure: Non-occupational (environmental) exposure to breathable airborne particles, mostly in an urban area, and lifestyle factors including smoking, recorded in pack-years
• Main results:
  • Total mineral particle concentration in lavage fluid ranged from 0.08 to 1.28 × 10^5 particles per ml across the 30 patients, with an estimated error of about 20%
  • About 42% of all detected particles were silicates and crystalline silica (group 1)
  • About 58% of all detected particles were metal compounds such as oxides, sulphates or alloys (group 2)
  • Asbestos fibers were found in 40% of the patients, at about 60 to more than 1,200 fibers per ml of lavage fluid
  • Only chrysotile asbestos was detected, generally as very thin fibers less than 0.3 micrometres in diameter
  • Patients with particle concentrations above the median smoked significantly more than those below it (group means 25.2 versus 14.4 pack-years; p = .025)
  • Metal-compound particle diameters also differed significantly between the two groups (p = .037) and were larger in the above-median group. No other significant differences were found for occupation or particle characteristics.
  • The number of asbestos-positive patients was similar in the two groups (5 below the median, 7 above). Patients above the median had a greater asbestos burden: 470 versus 130 fibers per ml.
• The authors' conclusion: The authors concluded that particles recovered from lavage fluid were a very useful tool for characterizing exposure to breathable dust. They also concluded that there was a notable relationship between smoking and particle burden, perhaps because smoke affects the lungs' clearance mechanisms.
• Limitations the authors state:
  • Removing mucus from the samples may have removed particle-laden cells, possibly causing particle concentrations to be underestimated
  • Some particles smaller than the filter pore size (0.45 micrometres) may have been lost, and the lost fraction cannot be determined
  • Concentration estimates carry an error of about 20%, due to the limited number of particles counted and possible measurement inaccuracies
  • Occupational histories were difficult to collect, so occupations were grouped only as white collar or blue collar

Topics

Medical terms in this study, explained in our Lexicon: Bronchoalveolar Lavage (BAL), Carcinoma, Transmission Electron Microscopy (TEM), Silicate, Habit.

Related studies

• Two dimensional protein patterns of bronchoalveolar lavage fluid from non-smokers, smokers, and subjects exposed to asbestos — M. Lindahl, T. Ekström, et al. (1996)
• Asbestos exposure assessment by mineralogical analysis of bronchoalveolar lavage fluid — P. Sartorelli, G. Scancarello, et al. (2001)
• Proteome analysis of bronchoalveolar lavage in individuals from Metsovo, nonoccupationally exposed to asbestos — D.T. Archimandriti, Y.A. Dalavanga, et al. (2009)
• A study of the length and diameter of fibres, in lung and in broncho-alveolar lavage fluid, following exposure of rats to chrysotile asbestos — E. Kauffer, J.C. Vigneron, et al. (1987)
• Diagnostic value of asbestos bodies in bronchoalveolar lavage fluid — P. De Vuyst, P. Dumortier, et al. (1987)
• Pleural plaques, asbestos exposure, and asbestos bodies in bronchoalveolar lavage fluid — E. Orlowski, J.C. Pairon, et al. (1994)

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