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Related Experiment Videos

Biphasic waveforms for ventricular defibrillation: optimization of total pulse and second phase durations

M H Matula1, M J Brooks, Q Pan

  • 1Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tannessee 37232-6300, USA.

Pacing and Clinical Electrophysiology : PACE
|October 6, 1997
PubMed
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Optimal biphasic waveforms for ventricular defibrillation were identified. Waveform duration significantly impacts defibrillation success, with specific durations showing improved efficacy over others.

Area of Science:

  • Cardiovascular Research
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Ventricular defibrillation efficacy is influenced by waveform parameters.
  • Biphasic waveforms are generally more effective than monophasic waveforms.
  • Optimal biphasic waveform parameters for ventricular defibrillation remain undetermined.

Purpose of the Study:

  • To investigate the impact of total pulse duration and second phase duration on voltage and energy requirements for biphasic ventricular defibrillation.
  • To identify optimal biphasic waveform parameters for improved defibrillation efficacy.

Main Methods:

  • Utilized an isolated rabbit heart model (Langendorff technique) to assess defibrillation efficacy.
  • Employed a truncated exponential biphasic waveform with the second phase voltage at 50% of the first phase voltage.

Related Experiment Videos

  • Used an up/down protocol to determine the 50% probability of success (E50) for delivered energy and initial voltage.

    • Main Results:

    • Shorter total pulse durations (4 ms) required significantly higher voltage for defibrillation compared to 8 ms waveforms.
    • Waveforms with equal phase durations between 6-16 ms showed similar defibrillation requirements to the 8 ms control.
    • Monophasic and very long asymmetric biphasic waveforms (4+16 ms) required higher energy and voltage than the control biphasic waveform.

    Conclusions:

    • Total pulse duration and second phase duration critically affect biphasic waveform defibrillation efficacy.
    • For symmetric biphasic waveforms, total durations of 6-16 ms appear optimal for defibrillation.
    • Asymmetric biphasic waveforms with second phase durations from 50%-200% of the first phase did not alter defibrillation efficacy compared to symmetric waveforms.