Hi this is why, if you have only monophasic units the high voltage could be between 1600V until 2300V (35Amps and 50Amps). This can injury the heart by metabolism.
In addition, biphasic waveforms are associated with less injurious effects on hemodynamic performance and myocardial metabolism.
In the worst case if you use a monophasic unit you can provocate a fibrillation signal.The monophasic mode means the current runs only in one direction. In biphasic mode it would be the power distributed in to directions plus and minus.
I use defibs since 1989 as paramedic and no as service engineer.
Best regards Jürgen
