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E-3
Philips Medical Systems
E
Defibrillation Waveform
category specifications
waveform parameters Biphasic truncated exponential. Waveform parameters are automatically
adjusted as a function of patient defibrillation impedance. In the diagram at left,
D is the duration of phase 1 and E is the duration of phase 2 of the waveform, F
is the interphase delay (500 µs), and Ip is the peak current.
The HeartStart delivers shocks to load impedances from 25 to 180 ohms. The
duration of each phase of the waveform is dynamically adjusted based on
delivered charge, in order to compensate for patient impedance variations, as
shown below:
adult defibrillation
load phase 1 phase 2 peak delivered
resistance (Ω) duration (ms) duration (ms) current (A) energy (J)
25 2.8 2.8 65 128
50 4.5 4.5 40 150
75 6.25 5.0 30 155
100 8.0 5.3 24 157
125 9.65 6.4 21 159
150 11.5 7.7 18 160
175 12.0 8.0 16 158
pediatric defibrillation
(using M5072A infant/child reduced-energy defibrillator pads)
load phase 1 phase 2 peak delivered
resistance (Ω) duration (ms) duration (ms) current (A) energy (J)
25 4.1 2.8 28 35
50 5.1 3.4 20 46
75 6.2 4.1 15 52
100 7.2 4.8 12 54
125 8.3 5.5 10 56
150 9.0 6.0 9 57
175 9.0 6.0 8 55