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Related Concept Videos

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 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-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:
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.
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,...
Asthma-IV: Diagnostic and Management01:30

Asthma-IV: Diagnostic and Management

The diagnosis and management of asthma are comprehensive, encompassing clinical assessments, lung function tests, and pharmacological interventions. Here's an overview:
Clinical Assessment for Asthma:
This is the first step in diagnosing and managing asthma. It includes:

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A Practical Clinical Model for Diagnosing Occupational Asthma in Workers Exposed to Low-Molecular-Weight Agents: Model Development and Validation.

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Related Experiment Video

Updated: Jul 17, 2026

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA
12:02

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA

Published on: May 2, 2018

New insights into occupational asthma.

Louis-Philippe Boulet1, Catherine Lemière, Denyse Gautrin

  • 1Unité de Recherche en Pneumologie, Institut de Cardiologie et de Pneumologie de l'Université Laval, Hôpital Laval, Québec, Canada.

Current Opinion in Allergy and Clinical Immunology
|January 16, 2007
PubMed
Summary

Occupational asthma affects many workers, particularly in manufacturing and construction. Research highlights immune responses and promising noninvasive diagnostic tools for managing this condition.

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Area of Science:

  • Occupational Medicine
  • Pulmonology
  • Immunology

Background:

  • Occupational asthma is a significant respiratory condition linked to workplace exposures.
  • Identifying causative agents and understanding disease mechanisms are crucial for effective management.

Purpose of the Study:

  • To review recent literature on occupational asthma.
  • To explore causative agents, induction mechanisms, and diagnostic/treatment strategies.
  • To update knowledge on prevalence and prevention.

Main Methods:

  • Literature review of recent publications.
  • Analysis of data on high-risk occupations and exposure scenarios.
  • Evaluation of diagnostic methods, including noninvasive airway inflammation markers.

Main Results:

  • High rates of occupational asthma identified in manufacturing, construction, and machine operation sectors.
  • Evidence supports CD4 T cell and neurogenic mechanisms in low-molecular-weight agent-induced asthma.
  • Sputum eosinophil monitoring shows promise for diagnosis and management, while exhaled nitric oxide is less clear.
  • Persistent asthma post-exposure and the need for surveillance programs are re-emphasized.

Conclusions:

  • Recent data enhance understanding of occupational asthma prevalence across diverse workforces.
  • Mechanisms of disease development, including immunological and neurogenic pathways, are further elucidated.
  • Noninvasive airway inflammation markers offer potential for improved diagnosis and management.
  • Prevention strategies and surveillance programs are vital for controlling occupational asthma.