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A Rat Model of Ventricular Fibrillation and Resuscitation by Conventional Closed-chest Technique
09:47

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Published on: April 26, 2015

From defibrillation theory to clinical implications.

Werner Irnich1

  • 1Justus-Liebig-University, Faculty of Medicine, Giessen, Germany. werner@irni.ch

Pacing and Clinical Electrophysiology : PACE
|December 23, 2009
PubMed
Summary
This summary is machine-generated.

Defibrillation theory verified: optimal pulse truncation at rheobase minimizes energy. Lower capacitance and precise pulse duration reduce energy needs, improving implantable cardioverter defibrillator (ICD) therapy.

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Area of Science:

  • Cardiovascular Research
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Defibrillation theory posits mean voltage threshold is hyperbolic to pulse duration.
  • Voltages below rheobase are counterproductive; truncation at rheobase yields minimal stored energy.
  • Animal experiments were conducted to validate this defibrillation theory.

Purpose of the Study:

  • To experimentally verify or falsify the theory on defibrillation thresholds.
  • To determine the optimal pulse truncation strategy for minimizing stored energy.
  • To investigate the relationship between pulse duration, voltage, and stored energy.

Main Methods:

  • 212 defibrillation thresholds in 22 swine were determined using biphasic pulses.
  • 92 pulses were optimally truncated in phase 1.
  • A step-up test procedure defined the threshold as the first successful shock.

Main Results:

  • Experimental proof confirms truncation at the rheobase condition yields the lowest stored energy.
  • Lower output capacitances significantly reduce energy requirements.
  • Deviations from optimal pulse duration (shorter or longer) increase energy demands.

Conclusions:

  • Truncation above or below rheobase increases stored energy thresholds.
  • Average voltage during pulse duration is a hyperbolic function of pulse duration.
  • Clinical implications include abandoning the constant tilt concept for optimal truncation in implantable cardioverter defibrillators (ICDs) and reducing output capacitance.