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Related Experiment Videos

Conduction disturbances caused by high current density electric fields.

S Yabe1, W M Smith, J P Daubert

  • 1Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710.

Circulation Research
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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Strong electrical fields during defibrillation can cause conduction block. Biphasic shocks cause less block than monophasic shocks, potentially explaining their higher efficacy in restoring normal heart rhythm.

Area of Science:

  • Cardiovascular Electrophysiology
  • Medical Device Technology
  • Cardiac Arrhythmia Research

Background:

  • Internal defibrillation involves high potential gradients near electrodes, potentially causing arrhythmias.
  • Understanding the impact of these fields on cardiac activation is crucial for device safety and efficacy.

Purpose of the Study:

  • To investigate the effects of strong electrical fields on cardiac activation propagation during internal defibrillation.
  • To compare the effects of monophasic versus biphasic defibrillation shocks on activation propagation and conduction block.

Main Methods:

  • Epicardial electrodes mapped activation sequences in dogs during pacing.
  • Monophasic or biphasic shocks were delivered, and potential gradients were calculated using a finite element method.

Related Experiment Videos

  • Activation sequences post-shock were analyzed to determine conduction block and recovery.

    • Main Results:

    • Conduction block occurred in areas with high potential gradients (>64 V/cm for monophasic, >71 V/cm for biphasic).
    • Higher gradients resulted in longer block durations.
    • Biphasic shocks generally caused shorter conduction block durations than monophasic shocks at similar field strengths.

    Conclusions:

    • Both monophasic and biphasic defibrillation shocks can induce conduction block.
    • Biphasic waveforms appear to cause less conduction block than monophasic waveforms.
    • Reduced conduction block with biphasic shocks may contribute to their enhanced defibrillation efficacy.