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Related Experiment Videos

Initial experience with a microprocessor controlled current based defibrillator.

G W Dalzell1, S R Cunningham, J Anderson

  • 1University of Ulster, Jordanstown.

British Heart Journal
|June 1, 1989
PubMed
Summary
This summary is machine-generated.

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A new current-based defibrillator, which adjusts energy by patient impedance, shows comparable success rates to traditional energy-based devices. This approach delivers significantly less energy and current per shock, optimizing ventricular defibrillation.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Intramyocardial current flow is crucial for successful ventricular defibrillation.
  • Transthoracic countershock success depends on energy and patient transthoracic impedance.
  • Optimizing defibrillation requires titrating energy based on individual impedance.

Purpose of the Study:

  • To develop and evaluate a microprocessor-controlled, current-based defibrillator.
  • To compare the efficacy and energy delivery of a current-based defibrillator against a conventional energy-based protocol.
  • To determine if current-based defibrillation can achieve comparable success rates with reduced energy and current output.

Main Methods:

  • A microprocessor-controlled current-based defibrillator was developed to automatically measure transthoracic impedance and calculate required energy.

Related Experiment Videos

  • The current-based protocol (30 A, 30 A, 40 A) was compared to a conventional energy-based protocol (200 J, 200 J, 360 J).
  • Success rates for first and first or second shocks were recorded for both protocols in episodes of ventricular fibrillation.

    • Main Results:

    • Both protocols demonstrated similar success rates: 80.9% (first shock) and 95.2% (first or second shock) for the energy protocol, versus 82.9% and 97.5% for the current protocol.
    • The current-based defibrillator delivered significantly less mean energy per shock (144.8 J) compared to the energy protocol (200 J).
    • Mean peak current for successful shocks was also reduced with the current-based defibrillator (29.0 A vs. 31.9 A).

    Conclusions:

    • A current-based defibrillator effectively titrates energy according to transthoracic impedance.
    • This approach achieves success rates comparable to conventional defibrillators.
    • Current-based defibrillation offers a significant advantage by delivering substantially less energy and current per shock.