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High frequency ventilation in dogs with open chests

B H Hoff, R B Smith, L Bunegin

    Critical Care Medicine
    |August 1, 1982
    PubMed
    Summary
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    High-frequency percutaneous transtracheal ventilation proved physiologically acceptable in dogs, even after thoracotomy. This advanced ventilation method maintained cardiac function and gas exchange, showing promise for open-chest procedures.

    Area of Science:

    • Veterinary Medicine
    • Anesthesiology
    • Cardiopulmonary Physiology

    Background:

    • Standard intermittent positive pressure ventilation (IPPV) is common in surgical settings.
    • High-frequency ventilation (HFV) techniques offer potential advantages in specific clinical scenarios.
    • Understanding the physiological impact of HFV during thoracic surgery is crucial.

    Purpose of the Study:

    • To evaluate and compare the physiological responses to high-frequency percutaneous transtracheal ventilation (HFPTTV) in dogs.
    • To assess HFPTTV's effects before and after median sternotomy thoracotomy.
    • To compare HFPTTV with standard IPPV under different chest conditions.

    Main Methods:

    • Dogs underwent HFPTTV at 100 and 300 breaths/min.
    • Ventilation was assessed with the chest closed and after thoracotomy.

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  • Physiological parameters including arterial/venous blood gases and cardiac performance metrics were monitored.

    • Main Results:

    • Gas exchange and cardiac performance remained clinically acceptable during HFPTTV.
    • Ventilation was adequate in the open-chest condition, with minor decreases in PaCO2 and PaO2.
    • Peak and mean airway pressures were comparable between IPPV and HFPTTV modes.

    Conclusions:

    • HFPTTV is a physiologically acceptable ventilation strategy in dogs, applicable both before and after thoracotomy.
    • HFPTTV demonstrates potential for use in thoracic surgery, maintaining cardiopulmonary stability.
    • Further research into HFPTTV's clinical utility in veterinary thoracic procedures is warranted.