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Related Experiment Videos

Parameters characterizing implantable defibrillator output: a proposal.

Werner Irnich1

  • 1Justus-Liebig-University, University Hospital, Friedrichstr 18, 35392, Giessen, Germany. werner@irni.ch

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|June 7, 2007
PubMed
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Implantable defibrillator (ICD) energy ratings are misleading. Effective energy depends on capacitance and resistance, not just nominal values, necessitating a

Area of Science:

  • Cardiovascular Medicine
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Current discussions in Heart Rhythm highlight the need for standardized characterization of implantable defibrillators (ICDs).
  • Existing methods for specifying ICD energy output lack clarity and can be misleading for device comparison.
  • Defibrillation efficacy is theoretically dependent on the time constant (RC), influenced by output capacitance and load resistance.

Purpose of the Study:

  • To contribute to the discussion on defibrillation characteristics for implantable cardioverter-defibrillators (ICDs).
  • To propose a standardized set of parameters for characterizing ICD devices and their energy output.
  • To provide recommendations for deriving effective energy for transparent and comparable device evaluation.

Main Methods:

Related Experiment Videos

  • Theoretical considerations based on defibrillation theories relating efficacy to the time constant (RC).
  • Analysis of device parameters including maximum voltage, capacitance, internal resistance, and tilt.
  • Derivation of effective energy from fundamental device characteristics for comparative analysis.

Main Results:

  • Nominal energy ratings of 'high output' ICDs are significantly devalued by increasing time constants (RC).
  • Effective energies of high-output devices are comparable to standard-output devices, challenging claims of superiority.
  • Fixed or suboptimal tilt settings further reduce effective energy or increase energy requirements.

Conclusions:

  • ICD devices should be characterized by fundamental parameters: voltage, capacitance, tilt/pulse duration, and internal resistance.
  • A 'devaluation factor' can quantify the reduction in efficacy due to the time constant, enhancing transparency.
  • These parameters allow for accurate derivation of effective energy, enabling meaningful comparison between ICDs.