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Smaller capacitors improve the biphasic waveform

K Rist1, P J Tchou, K Mowrey

  • 1University of Pittsburgh Medical Center, Pennsylvania.

Journal of Cardiovascular Electrophysiology
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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Smaller capacitance values in implantable cardioverter defibrillators (ICDs) reduce defibrillation energy requirements. This study found that using an 85 microfarad capacitor, compared to 140 microfarad, significantly lowered energy needs for biphasic waveforms.

Area of Science:

  • Cardiovascular Medicine
  • Biomedical Engineering
  • Medical Devices

Background:

  • Current implantable cardioverter defibrillators (ICDs) utilize large capacitance values.
  • Theoretical models suggest smaller capacitance values may improve defibrillation energy efficiency.

Purpose of the Study:

  • To compare the defibrillation energy requirements using different capacitance values in a biphasic waveform.
  • To evaluate the impact of capacitance on defibrillation threshold (DFT) in a porcine model.

Main Methods:

  • A porcine model was used to determine the defibrillation threshold (DFT).
  • Biphasic waveforms were generated using 140 microfarad and 85 microfarad capacitors.
  • Epicardial patch electrodes delivered shocks after induced ventricular fibrillation.

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Main Results:

  • The 85 microfarad capacitor resulted in significantly lower average delivered DFT energy (6.0 J vs 7.4 J, P < 0.04).
  • Phase 1 pulse width was significantly shorter with the 85 microfarad capacitor (5.1 ms vs 9.2 ms).
  • Lower impedances were observed with the 85 microfarad capacitor (54.4 Ω vs 59.9 Ω).

Conclusions:

  • Smaller capacitance values reduce energy requirements for biphasic defibrillation waveforms.
  • This approach may enhance the benefits of biphasic waveforms in ICDs.
  • Potential for higher leading edge voltage and significantly shorter pulse width observed.