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Asthma I: Introduction01:28

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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...
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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...
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Environmental pollution and allergy: historical aspects.

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Air pollution from traffic exhaust is linked to increased allergy prevalence, particularly hay fever. Studies show a rise in childhood allergies correlating with modern smog, suggesting a complex interplay of environmental and lifestyle factors.

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Area of Science:

  • Environmental Health
  • Immunology
  • Epidemiology

Background:

  • The historical association between industrialization and the rise of hay fever is noted.
  • Recent research links increasing allergy prevalence to outdoor air pollution, notably diesel exhaust.
  • The concept of allergotoxicology, studying toxic substances' effects on allergic reactions, has emerged.

Observation:

  • A study in Germany found lower hay fever rates in East German children despite higher SO2 and particulate matter pollution compared to West Germany.
  • Following reunification, East German children showed a rapid increase in allergy prevalence, nearing West German levels.
  • Atopic eczema, a skin manifestation of atopy, was surprisingly more frequent in East German children.

Findings:

  • Modern smog, primarily from traffic exhaust (fine and ultrafine particles), correlates with higher allergy and sensitization rates.
  • In vitro and animal studies demonstrate that air pollutants, including traffic exhaust and environmental tobacco smoke, can stimulate immune cells, promoting a Th2-dominated response.
  • The prevalence of hay fever in East German children increased significantly post-reunification, suggesting evolving environmental or lifestyle influences.

Implications:

  • Air pollution, especially traffic-related, is a significant factor in the rising incidence of allergic diseases.
  • Allergotoxicology provides a framework for understanding how environmental toxins contribute to allergic responses.
  • Further research is needed to elucidate the complex interplay of lifestyle and environmental factors in allergy development.