Table of Contents
What is a biphasic defibrillator?
Unlike conventional monophasic defibrillators, biphasic defibrillators deliver current in two directions. In the first phase, the current moves from one paddle to the other as with monophasic defibrillators. During the second phase, the current flow reverses direction.
What is monophasic and biphasic defibrillation?
In monophasic shock, the shock is given in only one direction from one electrode to the other. In a biphasic shock, initial direction of shock is reversed by changing the polarity of the electrodes in the latter part of the shock. Usually the initial voltage applied is higher than the reversed polarity shock.
How many joules does a defibrillator have for a child?
2 J/kg
In children, the current AHA guidelines recommend an initial dose of 2 J/kg, and escalating to 4 J/kg if the first one to two shocks are unsuccessful, while the ERC does not recommend escalation beyond the initial dose of 4 J/kg.
What is biphasic cardioversion?
With a biphasic shock, the current travels in two phases. In the first phase, the current runs from the first electrode to the second electrode via the patient’s heart. Then, the current reverses direction and runs from the second electrode back to the first via the heart.
How many joules is a biphasic defibrillator?
On a biphasic defibrillator, this is usually between 120 joules to 200 joules. On a monophasic defibrillator, this is usually 360 joules. If the manufacturers recommended dose is unavailable the AHA recommends giving the maximum available dose.
Which kind of defibrillator electrode is used for neonatal babies?
Automated external defibrillators (AEDs) with adult cables may be used for children as young as 1 year, but an AED with pediatric cables (maximum biphasic shock of 50 joules) is preferred for children between 1 year and 8 years.
How many joules should a 20kg child have?
For children with VF/pVT, PALS recommends a starting defibrillation dose of 2-4 J/kg and notes it is reasonable to repeat a shock of 4 J/kg if refractory. The European Resuscitation Council recommends a starting dose of 4 J/kg.
Are AED biphasic or monophasic?
biphasic
Most defibrillator manufacturers offer manual defibrillators that use a biphasic waveform, and most automated external defibrillators (AEDs) are now biphasic.
Can you defibrillate a child?
Automated external defibrillators (AEDs) may be used for children 1 to 8 years of age who have no signs of circulation. Ideally the device should deliver a pediatric dose.
Why is CPR done differently on children and infants?
Because a child’s physiology, musculature, bone density, and strength are different from an adult’s, CPR is performed differently.
Biphasic defibrillation is now a part of advanced cardiac life support (ACLS) guidelines. Biphasic shocks at energy levels of 200 joules or less are at least as safe and effective as monophasic shocks with traditional energies between 200 and 360 joules.
What is the recommended defibrillator dose for pediatric use?
With a manual defibrillator (monophasic or biphasic), use a dose of 2 J/kg for the first attempt and 4 J/kg for subsequent attempts.” FDA approval for the use of ZOLL’s Rectilinear Biphasic™ waveform technology on pediatrics was based on the results from A Comparative Biphasic Defibrillation Study for Pediatric Dosing Levels Using a Porcine Model.
What are monophasic and biphasic defibrillator shock waveforms?
Monophasic and Biphasic defibrillator shock waveforms. Defibrillator is a device used to shock the heart back into action when it stops contracting due to a disorder of the rhythm known as ventricular fibrillation (VF).
What are the American Heart Association (AHA) guidelines on Biphasic defibrillation?
The American Heart Association (AHA) guidelines released in 2000 include biphasic defibrillation (at 200 joules or less) as an intervention of choice for advanced cardiac life support (see What the AHA guidelines say about biphasic defibrillation ).