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Related Concept Videos

Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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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 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,...
Chronic Obstructive Pulmonary Disease II: Emphysema01:23

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Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

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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...

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Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
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Severe exacerbations predict excess lung function decline in asthma.

T R Bai1, J M Vonk, D S Postma

  • 1Respiratory Division, University of British Columbia, St Paul's Hospital, 1081 Burrard Street, Vancouver, BC, Canada. tbai@mrl.ubc.ca

The European Respiratory Journal
|June 1, 2007
PubMed
Summary
This summary is machine-generated.

Frequent severe asthma exacerbations significantly accelerate lung function decline in adults. This study demonstrates that each annual exacerbation is linked to a greater loss of forced expiratory volume in one second (FEV(1)).

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Clinical Research

Background:

  • Severe asthma exacerbations involve intense airway inflammation.
  • Hypotheses suggest exacerbations contribute to airway structural changes.
  • Previous studies have not definitively linked exacerbations to accelerated lung function decline.

Purpose of the Study:

  • To investigate the impact of severe asthma exacerbations on the progression of airway obstruction.
  • To determine if frequent exacerbations correlate with accelerated lung function decline in adults with asthma.

Main Methods:

  • A cohort study of 93 non-smoking adults with moderate-to-severe asthma.
  • Subjects were followed for a median of 11 years (>= 5 years).
  • Exacerbation rates and annual decline in forced expiratory volume in one second (FEV(1)) were analyzed.

Main Results:

  • 60.2% of subjects experienced at least one severe exacerbation.
  • Frequent exacerbations were independently associated with a significantly larger annual decline in FEV(1) (16.9 mL/yr).
  • Each severe exacerbation per year predicted an additional 30.2 mL/yr decline in FEV(1).

Conclusions:

  • Severe asthma exacerbations are associated with excess lung function decline.
  • Intermittent periods of worsening airway inflammation during exacerbations contribute to irreversible lung damage.
  • Findings support the hypothesis that exacerbations accelerate airway obstruction progression in asthma.