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Related Experiment Videos

Position may stop pneumothorax progression in dogs

A Zidulka, T F Braidy, M C Rizzi

    The American Review of Respiratory Disease
    |July 1, 1982
    PubMed
    Summary

    Placing the lung puncture site in a dependent position reduced pneumothorax formation and aided sealing. This suggests gravity influences pleural gas leak rates, potentially aiding treatment.

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    Area of Science:

    • Veterinary Medicine
    • Respiratory Physiology

    Background:

    • Pneumothorax, the presence of air in the pleural space, can complicate medical procedures.
    • Understanding factors influencing pneumothorax formation is crucial for patient management.

    Purpose of the Study:

    • To investigate the effect of body position on the rate of pneumothorax formation.
    • To determine if positioning the pleural gas leak in a dependent position influences leak rate and sealing.

    Main Methods:

    • Six anesthetized dogs were used, with pneumothorax induced via percutaneous lung puncture.
    • Dogs were alternated between dependent (puncture site down) and non-dependent (puncture site up) positions.
    • Pneumothorax accumulation rate was measured, and leaks were evacuated with the chest tube in the highest position.

    Main Results:

    • The rate of pneumothorax formation significantly decreased when the puncture site was in the dependent position compared to the non-dependent position.
    • Placing the leak in the dependent position resulted in complete sealing of the puncture site in 11 out of 21 instances.
    • No significant change in pneumothorax formation rate was observed when the puncture site remained in the non-dependent position.

    Conclusions:

    • Positioning the pleural gas leak in the most dependent position reduces the rate of pneumothorax formation.
    • This positional effect is likely due to reduced alveolar size and alveolar-to-pleural pressure gradient near the leak.
    • Dependent positioning may promote sealing of lung air leaks.

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