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Related Concept Videos

Other Pulmonary Disorders01:17

Other Pulmonary Disorders

889
Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.
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Breathing01:05

Breathing

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Pneumonia I: Introduction01:30

Pneumonia I: Introduction

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Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
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Health Hazards of Air Pollution01:20

Health Hazards of Air Pollution

Health Hazards of Air PollutionAir pollution doesn’t just harm the environment; it can also profoundly affect human health. Breathing polluted air can cause problems like asthma, allergies, lung diseases, and even heart conditions. Tiny particles, harmful gases like carbon monoxide, sulfur dioxide, nitrogen oxides, or chemicals from vehicles and factories can enter our lungs and bloodstream. Both outdoor and indoor air pollution can impact people, especially children, the elderly, and those...
Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

297
Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
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Chronic Obstructive Pulmonary Disease-I: Introduction01:20

Chronic Obstructive Pulmonary Disease-I: Introduction

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Chronic Obstructive Pulmonary Disease (COPD) is a long-lasting respiratory condition requiring continuous attention and care. It is a progressive lung disease that leads to breathing challenges due to airflow obstruction. It manifests as persistent respiratory symptoms and restricted airflow resulting from abnormalities in the airways and alveoli, usually due to long-term exposure to harmful particles or gases. COPD mainly consists of two primary conditions: emphysema and chronic bronchitis.
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Related Experiment Video

Updated: Aug 12, 2025

Establishing a Silicosis Rat Model via Exposure of Whole-Body to Respirable Silica
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Silica-associated lung disease in developing countries.

Sahajal Dhooria1, Inderpaul Singh Sehgal, Ritesh Agarwal

  • 1Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, Punjab, India.

Current Opinion in Pulmonary Medicine
|January 25, 2023
PubMed
Summary

Silica-associated lung diseases like silicosis pose a significant threat in developing nations. Early detection and prevention of silica exposure are crucial for mitigating these prevalent occupational health issues.

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Area of Science:

  • Occupational Health
  • Pulmonary Medicine
  • Epidemiology

Background:

  • Silica-associated lung diseases, particularly silicosis and silico-tuberculosis, represent a substantial global health burden, disproportionately affecting developing countries.
  • The epidemiology of these diseases highlights high incidence rates in nations like China, India, and Brazil, with worker exposure prevalence ranging significantly.
  • Existing permissible exposure limits for respirable silica in many developing countries exceed recommended safety standards, and informal industry exposure remains difficult to regulate.

Approach:

  • This review synthesizes current knowledge on the epidemiology, mitigation strategies, and treatment of silica-associated lung diseases in developing regions.
  • It examines recent governmental efforts in regulation and compensation, alongside emerging diagnostic tools such as biomarkers (e.g., club cell protein 16) and advanced imaging (CT scans).
  • The review also considers the potential of novel therapeutic agents, including antifibrotic drugs, for managing advanced stages of silicosis.

Key Points:

  • Silicosis incidence is highest in developing countries, with prevalence in exposed workers varying widely and potentially underestimated due to the 'healthy worker effect'.
  • Regulatory frameworks and compensation schemes are being implemented in developing nations, but effective on-ground execution is critical.
  • Early detection of silicosis may be enhanced by biomarkers and imaging techniques, though advanced disease remains largely incurable.

Conclusions:

  • Silica-associated lung diseases are a major public health concern in developing countries, necessitating urgent preventive measures.
  • Minimizing exposure to respirable crystalline silica through strengthened regulations and improved industrial practices is essential for disease mitigation.
  • While advanced silicosis lacks a cure, ongoing research into antifibrotic therapies offers potential future treatment avenues.