Philips M5066A User Manual
Page 45
E-3
Ph
ilip
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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