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Transepicardial defibrillation dose response: current versus energy

R C Wesley1, F Farkhani, D Porzio

  • 1Cardiology Section, VA Medical Center, Long Beach, California.

Pacing and Clinical Electrophysiology : PACE
|January 1, 1993
PubMed
Summary

This study found that transcardiac current offers little advantage over energy for defibrillation dose-response when resistance is stable. Adequate dose range is crucial for effective nonlinear logistic regression analysis in defibrillation research.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Physics

Background:

  • Transcardiac defibrillation is a critical procedure for cardiac rhythm management.
  • Optimizing the dose-response method for defibrillation is essential for patient safety and efficacy.
  • Understanding the relative roles of current and energy in defibrillation is an ongoing area of research.

Purpose of the Study:

  • To compare the efficacy of current versus energy in applying the dose-response method for transcardiac defibrillation.
  • To evaluate the influence of dose range on the performance of nonlinear logistic regression analysis in defibrillation studies.

Main Methods:

  • Pentobarbital-anesthetized dogs underwent transcardiac defibrillation using damped sinusoidal shocks delivered via epicardial patches.

Related Experiment Videos

  • The dose-response method was applied using either energy defibrillation threshold or current defibrillation threshold.
  • Seven doses ranging from 0.55 to 1.45 times the defibrillation threshold were administered in two sequential sets.
  • Data were analyzed using nonlinear logistic regression to assess correlation coefficients and success rates.

    • Main Results:

    • No significant differences were found between sequential shock sets for resistance or defibrillation success metrics (energy, current, voltage).
    • Correlation coefficients from nonlinear logistic regression analysis showed differences between energy- and current-based thresholds, potentially due to variations in tested dose ranges.
    • The study observed no significant advantage of using current over energy when tissue resistance remained constant during the dose-response assessment.

    Conclusions:

    • When tissue resistance is stable, transcardiac current provides limited additional benefit over energy in the dose-response method for defibrillation.
    • The effectiveness of nonlinear logistic regression analysis is highly dependent on utilizing an appropriate and sufficiently wide range of doses.
    • Further research may explore optimal parameters for defibrillation protocols considering both energy and current delivery.