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Morphometric analysis of the disorganization process of alveolar structures in subjects with paraquat toxicity Tohru Takahashi 1 , Yoshinobu Takahashi 1 , Eiko Wachi 2 , Takeshi Sugaya 3 , Tsuneo Namiki 4 1Department of Pathology, The Research Institute for Tuberculosis and Cancer, Tohoku University 21st Department of Pathology, Fukushima Medical College 3Institute of Rural Medicine, Hiraka General Hospital 4Department of Pathology, Sendai National Hospital pp.85-91
Published Date 1985/1/15
DOI https://doi.org/10.11477/mf.1404204585
  • Abstract
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Histopathologic examination was performed of autopsy lungs from fifteen patients who died 20 hours to 23 days after the ingestion of paraquat, disclosing that the basic morbid process consisted in the deposition of matrix substrate which extended on the surface of alveolar septa and in which mesenchymal cells proliferated. Alveolar septa were thickened rapidly and progressively by this deposi-tion, which, working as a diffusion barrier and restricting the distensibility of lung tissues, appearedbasically responsible for inducing severe respiratory failure. In view of this, the mean thickness d of alveolar septa was determined assuming a geometric model, in which the septa in a unit volume of tissue were transformed into a plate that was of a uniform thickness d and had the same surface area Sv as the septa ; Sv was estimated by line sampling on histologic lung sections, applying a basic prin-ciple of stereology. Because the measurement values were influenced more or less by the grade of collapse with which a given lung was fixed, a method to standardize the value of d was devised. The estimates of d remained in the normal range of 10 to 14μ within the first five days after the ingestion of paraquat, while it arose rapidly there-after, reaching 200μ at about the 20th day, whichwas sufficiently thick to obliterate alveolar spaces ; d was shown to follow an exponential function of t. This result coincided well enough with the actual histopathology where, at about 20 days, the shape of ducats and sacculus alveolaris was much sim-plified due to the obliteration of alveoli. On the other hand, in patients who survived relatively long and showed markedly advanced pulmonary changes, the lung never failed to harbor areas where alveoli were maintained uninvolved in fibrotic processes. This was clearly shown in the histogram of d where the variance was much larger in patients of longer survival, corresponding to the marked heterogeneity of pulmonary lesions often experienced in such patients.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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