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Related Experiment Videos

Waveforms for defibrillation and cardioversion: recent experimental and clinical studies.

Roger D White1

  • 1Department of Anesthesiology, Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota 55905, USA. white.roger@mayo.edu

Current Opinion in Critical Care
|May 29, 2004
PubMed
Summary

Biphasic waveforms are now standard for defibrillation and cardioversion, showing greater efficacy than older monophasic types. However, no specific biphasic waveform design has proven clinically superior for effectiveness or myocardial safety.

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Area of Science:

  • Cardiovascular Medicine
  • Biomedical Engineering

Background:

  • Biphasic waveforms have become the standard for external defibrillation and cardioversion.
  • Several distinct biphasic waveform designs have been developed and are in clinical use.

Purpose of the Study:

  • To review the current landscape of biphasic waveforms in defibrillation and cardioversion.
  • To compare the efficacy and safety of different biphasic waveform designs.

Main Methods:

  • Review of experimental and clinical investigations on biphasic waveforms.
  • Comparison of biphasic waveforms with monophasic waveforms.
  • Evaluation of different biphasic waveform designs, including biphasic truncated exponential, rectilinear, and pulsed biphasic.

Main Results:

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  • Biphasic waveforms demonstrate superior efficacy for defibrillation of ventricular fibrillation and cardioversion of atrial fibrillation compared to monophasic waveforms.
  • No definitive evidence exists to support the clinical superiority of any specific biphasic waveform design over others in terms of efficacy.
  • The potential for myocardial injury and its relationship to peak delivered current versus delivered energy remain areas for further investigation.

Conclusions:

  • Biphasic waveforms have largely replaced monophasic waveforms in clinical practice for defibrillation and cardioversion.
  • Current evidence does not establish a clear clinical advantage for one biphasic waveform design over another regarding efficacy or myocardial impact.