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Related Experiment Videos

Energy and current requirements for ventricular defibrillation using trapezoidal waves

L A Geddes, J D Bourland, W A Tacker

    The American Journal of Physiology
    |February 1, 1980
    PubMed
    Summary

    Ventricular defibrillation requires more energy and current for heavier dogs and ponies. Average current dose (amperes per kilogram) remained consistent across species, suggesting its utility in comparing defibrillation waveform effectiveness.

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    Area of Science:

    • Veterinary Medicine
    • Cardiovascular Research
    • Biomedical Engineering

    Background:

    • Ventricular defibrillation is critical for treating cardiac arrest.
    • Determining optimal energy and current thresholds is essential for effective defibrillation.
    • Previous research has explored various waveforms and their efficacy.

    Purpose of the Study:

    • To determine the threshold energy and current for ventricular defibrillation in dogs and ponies.
    • To investigate the influence of body weight and waveform tilt on defibrillation parameters.
    • To evaluate the utility of average current dose as a comparative metric for defibrillation waveforms.

    Main Methods:

    • Animals: Dogs (6.4-38 kg) and ponies (40-101 kg).
    • Waveform: Trapezoidal, 10 ms duration, with 10%, 50%, 70%, and 90% tilt.

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  • Application: Transchest electrodes.
  • Measurements: Threshold energy and current, success rate.

    • Main Results:

    • Energy and current required for defibrillation increased with body weight in both species.
    • Energy dose (J/kg) was higher in heavier animals; current dose (A/kg) was similar across species.
    • Success rate increased with higher energy and current doses for all waveforms.
    • Threshold average current for defibrillation ranged from 0.38 to 0.48 A/kg.

    Conclusions:

    • Body weight significantly influences defibrillation energy and current requirements.
    • Average current dose (A/kg) is a consistent metric across species and waveforms for defibrillation efficacy.
    • Findings support using average current as a standard for comparing defibrillation waveform effectiveness.