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Related Experiment Videos

Transthoracic defibrillation with chopping-modulated biphasic waveforms.

V Krasteva1, A Cansell, I K Daskalov

  • 1Centre of Biomedical Engineering, Bulgarian Academy of Sciences, Sofia.

Journal of Medical Engineering & Technology
|October 17, 2001
PubMed
Summary
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New biphasic waveforms for transthoracic defibrillation require less energy and reduce post-shock effects. Modulated biphasic pulses, specifically pulse-width modulation, show superior performance in animal studies for effective defibrillation.

Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Devices

Background:

  • Biphasic pulses are superior to monophasic pulses for transthoracic defibrillation.
  • Existing biphasic waveforms are implemented in commercial defibrillators.
  • Novel biphasic waveforms with optimized parameters are under investigation.

Purpose of the Study:

  • To evaluate a novel biphasic waveform with a balanced voltage ratio and 5 kHz chopping frequency.
  • To investigate the performance of pulse-width modulation (PWM) in biphasic defibrillation.
  • To compare the efficacy and safety of modulated biphasic waveforms against standard waveforms in animal models.

Main Methods:

  • Development and evaluation of a novel biphasic waveform with specific voltage ratios and chopping.

Related Experiment Videos

  • Testing of pulse-width modulation (PWM) for biphasic truncated exponential pulses.
  • Animal experiments comparing modulated biphasic pulses, non-modulated biphasic pulses, and standard damped sinusoidal waves.

    • Main Results:

    • The novel biphasic waveform used less than half the energy of monophasic waves with fewer adverse effects.
    • Pulse-width modulation demonstrated better performance than standard damped sinusoid and non-chopped biphasic pulses.
    • Animal experiments confirmed the superiority of the modulated waveform in reducing threshold defibrillation energy and post-shock disturbances.

    Conclusions:

    • Modulated biphasic waveforms, particularly PWM, offer improved defibrillation efficacy and safety.
    • These novel waveforms represent a significant advancement over traditional monophasic and non-modulated biphasic pulses.
    • Further clinical translation of these optimized biphasic waveforms is warranted for improved cardiac resuscitation.