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Related Concept Videos

Chronic Obstructive Pulmonary Disease I: Introduction01:23

Chronic Obstructive Pulmonary Disease I: Introduction

Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
Chronic Obstructive Pulmonary Disease-I: Introduction01:20

Chronic Obstructive Pulmonary Disease-I: Introduction

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.
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Asthma III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...

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Updated: Jun 28, 2026

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
08:17

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Published on: August 25, 2017

Occupational Exposure to Dust and Fumes Increases Risk for Future Adverse Clinical Outcomes.

Nutchapon Xanthavanij1, Riddhi Deshpande1, Junsun Yu2

  • 1Department of Medicine, Mount Auburn Hospital, Harvard Medical School, Cambridge, MA, United States.

American Journal of Respiratory and Critical Care Medicine
|June 26, 2026
PubMed
Summary

Occupational exposure to dust and fumes significantly increases risks for respiratory exacerbations, cardiovascular events, and pneumonia in smokers. This highlights the importance of workplace safety for long-term health outcomes.

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Area of Science:

  • Occupational health
  • Pulmonology
  • Cardiovascular medicine

Background:

  • Occupational dust and fume exposure is linked to respiratory issues.
  • The long-term clinical impact on smokers remains under-explored.

Purpose of the Study:

  • To investigate the association between occupational dust/fume exposure and future clinical outcomes in smokers.
  • Examined risks for respiratory exacerbations, cardiovascular events, and other conditions.

Main Methods:

  • COPDGene study participants (smokers, aged 45-80) categorized by occupational exposure (none, dust-only, fumes-only, dust-and-fumes).
  • Prospective follow-up for up to 15 years.
  • Outcomes included respiratory exacerbations, atherosclerotic cardiovascular disease (ASCVD), cancer, pneumonia, and blood clots.

Main Results:

  • Combined dust-and-fumes exposure was linked to higher risks of respiratory exacerbations (aRR 1.38), ASCVD (aOR 1.35), and pneumonia (aOR 1.39).
  • No significant association found for cancer or blood clots.
  • Prevalence: dust-only 12.0%, fumes-only 12.4%, dust-and-fumes 34.4%.

Conclusions:

  • Occupational exposure to both dust and fumes increases the risk of significant future health problems in individuals exposed to tobacco.
  • Findings underscore the need for protective measures in occupational settings for smokers.