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Truncated biphasic pulses for transthoracic defibrillation
G H Bardy1, B E Gliner, P J Kudenchuk
1Department of Medicine, University of Washington, Seattle.
Circulation
|March 15, 1995
Summary
Low-energy biphasic truncated shocks demonstrated equal efficacy to standard damped sine wave shocks for transthoracic defibrillation. This finding supports the development of smaller, more affordable automatic external defibrillators (AEDs) for wider public safety use.
Area of Science:
- Cardiology
- Medical Devices
- Emergency Medicine
Background:
- Early defibrillation is critical for out-of-hospital ventricular fibrillation survival.
- Wider deployment of automatic external defibrillators (AEDs) requires smaller, less expensive devices.
- Improving defibrillation efficacy is key to AED miniaturization and cost reduction.
Purpose of the Study:
- To evaluate the efficacy of two low-energy biphasic truncated waveforms for transthoracic defibrillation.
- To compare biphasic waveforms against a standard damped sine wave in humans.
Main Methods:
- Prospective, randomized comparison of three waveforms: 115 J biphasic, 130 J biphasic, and 200 J damped sine wave.
- Shocks delivered via right anterior and left lateral thoracic pads in 30 cardiac arrest survivors.
- Investigators were blinded to the waveform used; efficacy assessed after failed transvenous shocks.
Main Results:
- All three waveforms achieved a 97% first-shock ventricular defibrillation efficacy rate.
- The 115 J and 130 J biphasic waveforms were equally effective as the 200 J damped sine wave.
- Each waveform failed to defibrillate in one patient.
Conclusions:
- Low-energy biphasic truncated transthoracic shocks are as effective as standard 200 J damped sine wave shocks.
- Findings may facilitate the development of smaller, cost-effective transthoracic defibrillators.
- This advancement could lead to a new generation of AEDs for broader out-of-hospital use.