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Related Experiment Videos

Fibrillation induced at powerline current levels.

M A Chilbert, T Swiontek, J B Myklebust

    IEEE Transactions on Bio-Medical Engineering
    |August 1, 1989
    PubMed
    Summary

    High electrical currents can cause ventricular fibrillation in hogs, but only when applied during the T-wave. This research explores fibrillation thresholds and body resistance during electrical events.

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    Area of Science:

    • Cardiovascular physiology
    • Electrical safety research

    Background:

    • Electrical fibrillation is a significant cause of mortality.
    • Limited data exists on high-current, short-duration induced fibrillation.

    Purpose of the Study:

    • To investigate ventricular fibrillation induction in hogs using low-amperage currents (below 1-50 A).
    • To determine the effect of current application timing within the cardiac cycle.
    • To measure total body resistance under high voltage and current conditions.

    Main Methods:

    • Ventricular fibrillation was induced in hogs using currents ranging from 16 ms to 3 s.
    • Currents were applied during specific phases of the cardiac cycle, particularly the T-wave.
    • Total body resistance was measured during high-voltage and high-current applications.

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    Main Results:

    • Fibrillation occurred only when currents were applied during the T-wave period.
    • Fifty percent of T-wave current applications resulted in fibrillation.
    • Average body resistance was 284 ohms.
    • Body resistance decreased with increasing voltage, electrode size, and subsequent current applications.

    Conclusions:

    • The T-wave is a critical period for inducing ventricular fibrillation with electrical currents.
    • Understanding body resistance is crucial for electrical safety and medical device design.