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Related Experiment Videos

Improved internal defibrillation efficacy with a biphasic waveform.

E S Fain1, M B Sweeney, M R Franz

  • 1Division of Cardiology, Stanford University Medical Center, CA.

American Heart Journal
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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Biphasic waveforms significantly reduce voltage and energy needs for defibrillation compared to monophasic waveforms. This finding may enhance future automatic implantable defibrillator efficacy.

Area of Science:

  • Cardiovascular Medicine
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Current automatic implantable defibrillators use monophasic truncated exponential waveforms.
  • Wasted energy is discharged internally after shock delivery.

Purpose of the Study:

  • To compare the efficacy of monophasic and biphasic truncated exponential defibrillation waveforms.
  • To evaluate energy and voltage requirements for successful defibrillation.

Main Methods:

  • A novel deployable intrapericardial electrode system was used in seven closed-chest dogs.
  • Monophasic and biphasic waveforms were delivered, with varying initial voltages.
  • Curves of successful defibrillation versus voltage and energy were constructed.

Related Experiment Videos

Main Results:

  • Biphasic waveforms required significantly lower initial voltage (V50, V80) and energy (E50, E80) for defibrillation.
  • V50: 194 V (biphasic) vs 227 V (monophasic); E50: 2.7 J (biphasic) vs 3.4 J (monophasic).
  • p-values < 0.05 indicated statistical significance for all comparisons.

Conclusions:

  • A biphasic waveform produced by single discharge significantly reduces defibrillation energy and voltage requirements.
  • Utilizing remaining capacitor energy with biphasic waveforms may improve automatic implantable defibrillator efficacy.
  • Future implantable defibrillators could benefit from biphasic waveform technology.