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Related Experiment Videos

Experimental pendulum air in the flail chest.

K Harada, N Saoyama, K Izumi

    The Japanese Journal of Surgery
    |May 1, 1983
    PubMed
    Summary

    Pendulum airflow, a breathing phenomenon, occurs in flail chest patients under spontaneous ventilation. Factors like pressure differences and high respiratory rates influence its occurrence and potential impact on ventilation.

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    Area of Science:

    • Respiratory Physiology
    • Thoracic Surgery

    Background:

    • Flail chest injuries can compromise respiratory mechanics.
    • The existence and significance of pendulum airflow in spontaneous ventilation remain debated.

    Purpose of the Study:

    • To investigate the conditions under which pendulum airflow occurs in a flail chest model.
    • To determine the factors influencing pendulum airflow and its impact on alveolar ventilation.

    Main Methods:

    • Experimental flail chest model created in adult dogs by removing ribs and chest wall.
    • Pendulum airflow recorded pneumotachometrically via bronchial intubation.
    • Analysis of respiratory parameters including airway pressure, ventilatory volume, and respiratory frequency.

    Main Results:

    • Pendulum airflow was observed under spontaneous ventilation in the flail chest model.
    • Key facilitating factors included inter-lung pressure/volume differences, high respiratory frequency, and increased upper airway resistance.
    • Pendulum airflow occurred transiently in both central and peripheral airways but was minimal in most cases.
    • Significant disturbance to alveolar ventilation occurred with severe chest wall dysfunction or high airway resistance.

    Conclusions:

    • Pendulum airflow is a real phenomenon in spontaneous ventilation with flail chest.
    • Its clinical significance is generally minimal but can be substantial in severe cases, impacting alveolar ventilation.
    • Understanding these factors is crucial for managing respiratory compromise in flail chest patients.

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