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Related Experiment Videos

Testing different biphasic waveforms and capacitances: effect on atrial defibrillation threshold and pain perception

G Tomassoni1, K H Newby, M M Kearney

  • 1Electrophysiology Laboratory, Duke University, Veterans Affairs Medical Center, Durham, North Carolina 27705, USA.

Journal of the American College of Cardiology
|September 1, 1996
PubMed
Summary

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Optimizing biphasic shocks for atrial defibrillation (ADF) requires specific waveform tilts and capacitances. Lower energy requirements were achieved with 50% tilt and 50-microfarad capacitance, though shocks remained painful.

Area of Science:

  • Electrophysiology
  • Cardiology
  • Medical Devices

Background:

  • Biphasic shocks are superior to monophasic for atrial defibrillation.
  • Optimal biphasic waveform parameters (tilt, capacitance) for atrial defibrillation efficacy and patient comfort are not well-established.

Purpose of the Study:

  • To compare the efficacy and pain perception of different biphasic shock tilts and capacitances during atrial defibrillation.
  • To determine optimal parameters for biphasic atrial defibrillation.

Main Methods:

  • Atrial defibrillation threshold (DFT) testing in 38 patients with paroxysmal atrial fibrillation.
  • Randomized testing of biphasic waveforms with varying tilts (40%-80%) and capacitances (50-microF, 120-microF).
  • Pain assessment using a standardized scale before sedation.

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Main Results:

  • A 50% tilt waveform significantly reduced DFT energy compared to higher tilts (65%, 80%).
  • A 40%/50% tilt waveform showed slightly lower energy needs than the 50% tilt.
  • Lower capacitance (50-microF) reduced energy requirements compared to 120-microF.
  • Shocks below 1 Joule were frequently perceived as painful.

Conclusions:

  • Biphasic waveforms with 50% tilt or 40%/50% tilt decrease energy requirements for atrial DFT.
  • Utilizing 50-microF capacitance reduces stored energy compared to 120-microF.
  • Despite energy reductions, shocks < 1 Joule remain painful, indicating a need for further pain management strategies.