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Related Concept Videos

Asthma I: Introduction01:28

Asthma I: Introduction

Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
Asthma-I: Introduction01:29

Asthma-I: Introduction

Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Asthma-III: Symptoms and Complications01:24

Asthma-III: Symptoms and Complications

Asthma, a common chronic respiratory condition, is classified considering the frequency and severity of symptoms alongside lung function impairment. Understanding this classification is essential for appropriate treatment and management. Here's a detailed look at the classification of asthma and its clinical features and complications:
Classification of Asthma
Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.

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Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
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Relationship between air pollution, lung function and asthma in adolescents.

Talat Islam1, W James Gauderman, Kiros Berhane

  • 1Department of Preventive Medicine, Keck School of Medicine, Los Angeles, California 90033, USA.

Thorax
|May 23, 2007
PubMed
Summary

Better lung function protects children from developing asthma. However, exposure to high levels of fine particulate matter (PM2.5) weakens this protective effect, increasing asthma risk in children.

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Area of Science:

  • Environmental Health
  • Pediatric Pulmonology
  • Epidemiology

Background:

  • The relationship between air pollution, lung function, and childhood asthma incidence requires further clarification.
  • Investigating the association between lung function and new-onset asthma is crucial.
  • Understanding how ambient air pollutants modify this relationship is essential.

Purpose of the Study:

  • To determine if lung function is associated with new-onset childhood asthma.
  • To examine whether ambient air pollutants modify the association between lung function and asthma development.

Main Methods:

  • A cohort of 9-10 year olds without asthma was followed for 8 years.
  • Continuous monitoring of ambient air pollutants and annual spirometry and asthma diagnosis.
  • Proportional hazard regression models were used to analyze lung function, asthma development, and pollutant exposure.

Main Results:

  • Better lung function, specifically forced expiratory flow over mid-expiration (FEF25-75), was associated with a reduced hazard of new-onset asthma (HR 0.50).
  • This protective effect was diminished in areas with high fine particulate matter (PM2.5) exposure (HR 0.76 vs. 0.34 in low PM2.5 areas).
  • Similar patterns were observed for forced expiratory volume in 1 second, while ozone showed minimal impact.

Conclusions:

  • High levels of fine particulate matter (PM2.5) attenuate the protective effect of good lung function against new-onset asthma.
  • Air quality, particularly PM2.5, plays a significant role in the development of childhood asthma.
  • Lung function may be a key factor, but its protective capacity is influenced by environmental exposures.