1.3 What is the difference between monophasic and biphasic waveforms? : St. John Ambulance

1.3 What is the difference between monophasic and biphasic waveforms? Print

Modified on: Wed, Jan 17, 2018 at 10:45 AM

Monophasic waveform means that the current generated by the AED travels through the heart in one direction only. The monophasic waveform is most common with early defibrillators.

Biphasic waveform means that the current generated by the AED travels through the heart in two vectors. The current moves from the first pad to the second pad and then from the second pad to the first pad. Current AED models use biphasic waveforms.

Biphasic waveform is better than monophasic because a smaller current is needed to correct the abnormal heart rhythm associated with the cardiac arrest; therefore a higher chance of correcting the heart rhythm with less shocks. There is also a lower risk of heart muscle damage with biphasic defibrillation.

All AED models sold by St. John Ambulance use the biphasic waveform.

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1.3 What is the difference between monophasic and biphasic waveforms? Print

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