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Energy dose for ventricular defibrillation of children
Insights
Pediatric transthoracic direct current shock effectively treats ventricular fibrillation. An energy dose of 2 watt-seconds per kilogram is generally adequate for defibrillating children, with higher doses reserved for unsuccessful initial attempts.
Area of Science:
- Pediatric Cardiology
- Emergency Medicine
- Electrophysiology
Background:
- Transthoracic direct current (DC) shock is the standard treatment for ventricular fibrillation in pediatric patients.
- Determining the optimal energy dose for pediatric defibrillation is crucial for effective resuscitation.
Purpose of the Study:
- To evaluate the efficacy of different energy doses of transthoracic DC shock for terminating ventricular fibrillation in children.
- To establish appropriate energy dose guidelines for pediatric defibrillation.
Main Methods:
- Data were collected from 71 defibrillation attempts in 27 pediatric patients.
- Analysis focused on the success rates of shocks delivered at various energy levels, particularly around 2 watt-seconds per kilogram (w-sec/kg).
Main Results:
- 89% of all shocks successfully terminated ventricular fibrillation.
- Shocks delivered within 10 w-sec of 2 w-sec/kg had a 91% success rate.
- All successful defibrillations were achieved with 4 w-sec/kg or less.
Conclusions:
- An energy dose of 2 w-sec/kg (approximately 1 w-sec/lb) is adequate for defibrillating most children under 50 kg.
- Current practice of using 2 w-sec/kg and doubling the dose for unsuccessful attempts is supported by these findings.
- Further research may refine pediatric defibrillation protocols.
Abstract:
Transthoracic direct current shock is the recommended treatment for ventricular fibrillation in children as in adults. To determine the appropriate energy dose, data were collected from 71 defibrillation attempts in 27 children. Sixty-three of the 71 shocks (89%) were successful in terminating fibrillation. Fifty-seven shocks were within 10 watt-seconds (w-sec) above or below an energy dose of 2 w-sec/kg of body weight. Fifty-two (91%) of these were effective and five (9%) were ineffective. In every case, fibrillation was ultimately terminated by a shock of 4 w-sec/kg or less. The results of these studies suggest that an energy dose of 2 w-sec/kg (or approximately 1 w-sec/lb) is adequate to defibrillate most children weighing under 50 kg. We currently use 2 w-sec/kg and double the energy dose if the first defibrillation attempt is unsuccessful.