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Diaphragm pacing. Evaluation of current waveforms for effective ventilation

T Kaneyuki, J F Hogan, W W Glenn

    The Journal of Thoracic and Cardiovascular Surgery
    |July 1, 1977
    PubMed
    Summary
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    Diaphragm pacing waveform configuration impacts fatigue. Specific waveforms like UDC-monopolar cathodal and ABDC show better short-term effectiveness, while hypoxemia accelerates diaphragm fatigue.

    Area of Science:

    • Biomedical Engineering
    • Respiratory Physiology

    Background:

    • Diaphragm pacing is a crucial intervention for respiratory support.
    • Optimizing stimulating waveform configuration is key to enhancing pacing effectiveness and longevity.

    Purpose of the Study:

    • To evaluate the impact of different stimulating waveform configurations on diaphragm pacing efficacy.
    • To assess the influence of pulse interval and arterial oxygen tension on diaphragm pacing performance and fatigue.

    Main Methods:

    • Tested four current forms: UDC-bipolar, UDC-monopolar cathodal, UDC-monopolar anodal, and ABDC.
    • Varied pulse intervals (37 msec. and 20 msec.) and monitored tidal volume and arterial oxygen tension (PaO2).
    • Investigated the effect of hypoxemia and hyperoxygenation on diaphragmatic action potentials.

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    Main Results:

    • UDC-monopolar cathodal and ABDC waveforms maintained effectiveness longer than UDC-bipolar and UDC-monopolar anodal at 37 msec. pulse interval.
    • Reduced pulse interval to 20 msec. decreased tidal volume for UDC-monopolar cathodal and ABDC.
    • Hypoxemia significantly reduced diaphragmatic action potential amplitude, accelerating fatigue; oxygen administration improved PaO2 and restored potentials.

    Conclusions:

    • Waveform configuration significantly influences the onset of diaphragm fatigue.
    • Hypoxemia exacerbates diaphragm fatigue during electrical stimulation.
    • Optimized waveform selection and maintaining adequate oxygenation are critical for effective diaphragm pacing.