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Related Experiment Videos

Waveform analysis of biphasic external defibrillators.

U Achleitner1, K Rheinberger, B Furtner

  • 1Department of Anaesthesiology and Critical Care, University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria.

Resuscitation
|November 24, 2001
PubMed
Summary
This summary is machine-generated.

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Biphasic external defibrillators show significant variations in waveform characteristics and performance. These differences highlight the need for careful consideration of transthoracic impedance when selecting and using these critical devices.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Electrophysiology

Background:

  • Biphasic waveforms are utilized in internal and some external defibrillators.
  • Understanding defibrillator performance is crucial for effective resuscitation.

Purpose of the Study:

  • To analyze the discharged waveform pulses of manual and semi-automated biphasic external defibrillators.
  • To compare the performance characteristics of different biphasic defibrillator models.

Main Methods:

  • Discharged waveform pulses from two manual and two semi-automated biphasic external defibrillators were analyzed.
  • Defibrillators were tested using resistive loads of 25, 50, and 100 Ohms to simulate transthoracic impedance.
  • Key parameters including initial current, voltage, delivered energy, shock duration, and charge flow were measured.

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Main Results:

  • Significant variations in initial current (10.9-73.3 A) and voltage (482.8-2140.0 V) were observed.
  • Delivered energy deviations reached up to +19.1% or -28.9% for manual defibrillators.
  • Impedance-normalized delivered energy ranged from 1.0 to 12.5 J/Ohm, with pulse duration and charge flow varying with load and phase.

Conclusions:

  • Tested biphasic external defibrillators exhibited substantial differences in waveform design.
  • Defibrillator performance demonstrated a notable dependence on transthoracic impedance.
  • These findings underscore the variability in biphasic defibrillator technology and its interaction with patient impedance.