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Related Experiment Videos

Collateral ventilation in man.

P B Terry, R J Traystman, H H Newball

    The New England Journal of Medicine
    |January 5, 1978
    PubMed
    Summary
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    Collateral ventilation, the airflow bypassing normal airways, is higher in emphysema patients than in healthy individuals. This pathway aids ventilation distribution when airways are compromised.

    Area of Science:

    • Pulmonary Physiology
    • Respiratory Medicine

    Background:

    • Collateral ventilation facilitates alveolar gas exchange through alternative pathways.
    • Understanding its mechanics is crucial for respiratory disease management.

    Purpose of the Study:

    • To investigate age-related and emphysema-related changes in collateral ventilation mechanics.
    • To compare airflow resistance through collateral channels versus normal airways.

    Main Methods:

    • Mechanics of collateral ventilation were assessed in young normal subjects, old normal subjects, and emphysema patients.
    • Airflow resistance was measured through collateral channels and normal airways (bronchi and bronchioles).

    Main Results:

    • In supine normal subjects, collateral resistance exceeded airway resistance during quiet expiration.

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  • In emphysema, increased airway resistance led to preferential airflow through collateral pathways.

    • Conclusions:

    • High collateral resistance normally limits collateral airflow in supine individuals.
    • Collateral channels become significant for ventilation distribution in emphysema due to airway obstruction.