Pediatric transthoracic defibrillation: biphasic versus monophasic waveforms in an experimental model

Area of Science:

• Pediatric Cardiology
• Emergency Medicine
• Biomedical Engineering

Background:

• The efficacy of biphasic waveforms for defibrillation in pediatric patients remains unestablished.
• Current pediatric resuscitation guidelines lack definitive waveform recommendations.

Purpose of the Study:

• To compare the effectiveness of biphasic versus monophasic waveforms in pediatric defibrillation using a porcine model.
• To evaluate the safety and efficacy of varying energy levels and pulse durations for pediatric defibrillation.

Main Methods:

• Ventricular fibrillation was induced in infant (3-6 kg) and child (7-12 kg) piglets.
• Transthoracic shocks with monophasic and biphasic waveforms (5 ms and 10 ms) were delivered at escalating energies (7-100 J).
• Shock success rate, defined as termination of ventricular fibrillation, was the primary outcome measure.

Main Results:

• Biphasic waveforms demonstrated superior shock success rates compared to monophasic waveforms in both infant and child porcine models.
• High success rates (>80%) were achieved with low-energy biphasic shocks: 20 J (4 J/kg) in infants and 30 J (3 J/kg) in children.
• Adverse events, such as pulseless electrical activity, were similar between biphasic and monophasic waveform groups.

Conclusions:

• Biphasic waveforms are more effective than monophasic waveforms for pediatric defibrillation.
• Low-energy biphasic shocks provide high success rates, representing a significant advancement in pediatric resuscitation.
• These findings support the use of biphasic waveforms in pediatric advanced life support protocols.