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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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Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Regulation of Water Intake01:25

Regulation of Water Intake

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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Asthma-I: Introduction01:29

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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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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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Related Experiment Video

Updated: May 5, 2026

A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice
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Hyperosmolarity as the stimulus to asthma induced by hyperventilation?

C M Smith, S D Anderson

    The Journal of Allergy and Clinical Immunology
    |May 1, 1986
    PubMed
    Summary

    Airway hyperosmolarity from water loss may trigger asthma during exercise. This study found similar airway responses to isocapnic hyperventilation and inhaled hypertonic saline, supporting this mechanism.

    Area of Science:

    • Respiratory Medicine
    • Pulmonary Physiology
    • Asthma Pathophysiology

    Background:

    • Exercise-induced asthma is linked to evaporative water loss from airways.
    • Hyperosmolarity of airway epithelial fluid is a proposed trigger for asthma symptoms.

    Purpose of the Study:

    • To compare water loss during hyperpnea with theoretical water loss from a hypertonic stimulus.
    • To determine if comparable water loss volumes induce similar airway responses.

    Main Methods:

    • Compared airway responses (FEV1 changes) to isocapnic hyperventilation (ISH) and inhaled 4.5% NaCl aerosol in 17 asthma subjects.
    • Calculated water loss (wloss) for both stimuli and analyzed dose-response curves (PD20, PDmax).

    Main Results:

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  • No significant difference in the provocative dose causing a 20% fall in FEV1 (PD20) between ISH and 4.5% NaCl.
  • Similar dose-response curve shapes (PDmax:PD20 ratio) were observed for both stimuli.
  • Calculated wloss values were 29 mg/L for ISH and 4.0 ml/L for 4.5% NaCl.

    • Conclusions:

    • Airway hyperosmolarity induced by water loss is a likely mechanism for isocapnic hyperventilation-induced asthma.
    • These findings support hyperosmolarity as a unifying mechanism for exercise-induced asthma.