PHILIPS MEDICAL SYSTEMS
B-2
DEFIBRILLATOR
category nominal 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 (400 μs), and Ip is the peak current.
The HeartStart FR2+ 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 60 140
50 4.1 4.1 33 150
75 5.8 or 7.2 3.8 or 4.8 23 153
100 9.0 6.0 17 157
125 12.0 8.0 14 161
150 12.0 8.0 12 157
175 12.0 8.0 10 151
pediatric defibrillation
(using M3870A FR2 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 4.1 22 35
50 5.8 3.8 17 48
75 5.8 3.8 14 53
100 7.2 4.8 11 55
125 7.2 4.8 10 54
150 9.0 6.0 9 54
175 9.0 6.0 8 53
NOTE: The values given are nominal. The actual phase durations for a given load
resistance on the pediatric table above could be those of an adjacent row.
To Next Page
Loading...