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Long-term transtracheal high frequency ventilation in dogs

R B Smith, F Cutaia, B H Hoff

    Critical Care Medicine
    |April 1, 1981
    PubMed
    Summary

    High-frequency percutaneous transtracheal ventilation (HFTV) for 24 hours in dogs showed no adverse cardiopulmonary effects. This study demonstrates HFTV

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    Area of Science:

    • Veterinary Medicine
    • Respiratory Physiology
    • Critical Care

    Background:

    • Long-term effects of high-frequency percutaneous transtracheal ventilation (HFTV) remain understudied.
    • Assessing cardiopulmonary effects of prolonged HFTV is crucial for clinical application.

    Purpose of the Study:

    • To evaluate the cardiopulmonary effects of 24-hour transtracheal ventilation at a high frequency (100 breaths/min) in dogs.

    Main Methods:

    • Four dogs underwent 24-hour HFTV via a transtracheal catheter at 100 breaths/min, FiO2 0.4, I:E ratio 1:2, tidal volume 70 ml, and 50 psi driving pressure.
    • Cardiopulmonary parameters including blood gases, pressures, heart rate, cardiac output, and vascular resistances were monitored.
    • Post-ventilation recovery and airway/lung histology were assessed.

    Main Results:

    • No significant changes were observed in blood gases (PaO2, PaCO2, pH), hemodynamic pressures, heart rate, cardiac index, stroke index, ventricular stroke work, vascular resistances (SVR, PVR), oxygen consumption, or pulmonary shunt over 24 hours.
    • A positive end-expiratory pressure (PEEP) effect of 2.9-5.0 torr was maintained.
    • All dogs recovered uneventfully, with normal blood gases and histology after 3 days.

    Conclusions:

    • Twenty-four-hour transtracheal high-frequency ventilation at 100 breaths/min is safe in dogs.
    • HFTV can be used for extended periods without significant adverse cardiopulmonary effects.
    • This supports the potential of HFTV for long-term ventilatory support.

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