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DEFIBRILLATION WAVEFORM
category
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 OnSite 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:
resistance (Ω) duration (ms)
resistance (Ω) duration (ms)
adult defibrillation
load
phase 1
25
2.8
50
4.5
75
6.25
100
8.0
125
9.65
150
11.5
175
12.0
pediatric defibrillation
(using M5072A infant/child reduced-energy defibrillator pads)
load
phase 1
25
4.1
50
5.1
75
6.2
100
7.2
125
8.3
150
9.0
175
9.0
specifications
phase 2
peak
duration (ms)
current (A)
2.8
65
4.5
40
5.0
30
5.3
24
6.4
21
7.7
18
8.0
16
phase 2
peak
duration (ms)
current (A)
2.8
28
3.4
20
4.1
15
4.8
12
5.5
10
6.0
9
6.0
8
delivered
energy (J)
128
150
155
157
159
160
158
E
delivered
energy (J)
35
46
52
54
56
57
55
E-3
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