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Related Concept Videos

Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

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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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Asthma-I: Introduction01:29

Asthma-I: Introduction

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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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Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

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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:
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Microbiota of the Respiratory Tract01:29

Microbiota of the Respiratory Tract

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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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Asthma I: Introduction01:28

Asthma I: Introduction

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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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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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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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Related Experiment Video

Updated: May 3, 2026

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
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Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels

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Bronchiolitis and asthma: possible common pathogenetic pathways.

K McIntosh

    The Journal of Allergy and Clinical Immunology
    |June 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Viral infections can cause wheezing in children. Immune responses, particularly Gell and Coombs types 1, 3, and 4, may explain this in normal and asthmatic children, suggesting a shared obstruction mechanism.

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    Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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    Isolating Bronchial Epithelial Cells from Resected Lung Tissue for Biobanking and Establishing Well-Differentiated Air-Liquid Interface Cultures
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    Area of Science:

    • Pediatric respiratory medicine
    • Immunology
    • Virology

    Background:

    • Virus-induced wheezing is common in children.
    • Asthma diagnosis in young children with wheezing is complex.
    • Viral bronchiolitis and wheezing share potential common pathways.

    Purpose of the Study:

    • To discuss potential mechanisms of virus-induced wheezing in children.
    • To explore immune system involvement in viral bronchiolitis.
    • To consider shared pathways between bronchiolitis and asthma in children.

    Main Methods:

    • Literature review and theoretical discussion.
    • Analysis of immune response classifications (Gell and Coombs).
    • Comparison of clinical presentations in normal and asthmatic children.

    Main Results:

    • Gell and Coombs types 1, 3, and 4 immune responses are attractive theories for viral bronchiolitis.
    • A continuum exists between viral bronchiolitis and virus-induced wheezing.
    • Common mechanisms for bronchiolar obstruction are suggested.

    Conclusions:

    • Immune mechanisms are key to understanding virus-induced wheezing.
    • The distinction between viral bronchiolitis and childhood asthma may be blurred.
    • Further research into shared pathways is warranted.