Cardiac Science Powerheart G5, User Manual

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Powerheart® G5 Automated External Defibrillator 70-00569-02 G C-3
STAR® biphasic waveform
STAR® biphasic waveform
The waveform generated by the Cardiac Science AED is a biphasic truncated exponential
waveform. The waveform complies with the IEC 60601-2-4 standard. Figure 1 is a graph of the
waveform voltage as a function of time when the AED is connected to a 50 ohm resistive load
using adult defibrillation pads.
Figure 1: High variable energy waveform with 50 ohm resistive load
Patient impedance
The Cardiac Science Biphasic Truncated Exponential (BTE) waveform uses variable energy.
The actual energy that is delivered varies with the patient’s impedance. The device delivers a shock
to a patient with an impedance in the range of 25-175 ohms. Energy is delivered at up to three
different levels: ultra-low variable energy, low variable energy and high variable energy (see the
waveform and energy tables on the following pages).
2000.0
1500.0
1000.0
500.0
0.0
-500.0
-1000.0
-1500.0
-1.000 0.000 1.000 2.000 3.000 4.000 5.000 6.000 7.000 8.000 9.000 10.000
Vo
lt
a
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e
(
v
)
Time (ms)