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Updated: Aug 7, 2026
05:03
Establishing a Silicosis Rat Model via Exposure of Whole-Body to Respirable Silica
Published on: October 28, 2022
Mountain desert silicosis
1IG Medical College, Shimla, HP.
The Journal of the Association of Physicians of India
|April 25, 2000
Summary
Silicosis was diagnosed in Himalayan highlanders with miliary shadows, even without occupational exposure. Environmental silica exposure in their high-altitude desert region is implicated in this high-incidence respiratory disease.
Area of Science:
- Pulmonary Medicine
- Environmental Health
- Radiology
Background:
- Miliary shadows on chest X-rays in high-altitude populations can indicate various lung conditions.
- Silicosis is a serious occupational lung disease caused by silica dust inhalation.
Purpose of the Study:
- To investigate the prevalence and causes of silicosis in highlanders of the Himalayan desert presenting with radiological miliary shadows.
- To determine if occupational exposure is the sole source of silica exposure in this population.
Main Methods:
- Seventeen highlanders with miliary shadows were evaluated at a Himalayan medical camp.
- Diagnostic workup included detailed occupational and environmental history, hemogram, chest skiagrams, pulmonary function tests, and soil silica analysis.
Main Results:
- Silicosis was confirmed in all 17 participants (chronic simple variety).
- No silicosis-prone industries were identified in their locality, and only three had relevant work history.
- High silica content (36.8%) was found in the local soil, suggesting environmental exposure.
Conclusions:
- Highlanders in the Himalayan desert can develop silicosis without direct occupational exposure.
- Environmental exposure to silica-rich soil is a significant factor contributing to silicosis in this high-altitude population.
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