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SCOPE™ Biphasic Waveform
The SAM 500P delivers a Self
Compensating Output Pulse Envelope
(SCOPE) biphasic waveform. This
waveform automatically optimises the
waveform pulse envelope (amplitude,
slope, and duration) for a wide range of
patient impedances, from 20 ohms to
230 ohms. The delivered waveform to
the patient is an optimised, impedance-
compensated, biphasic, truncated
exponential waveform that incorporates
an escalating energy protocol of 150
joules, 150 joules, and 200 joules. The
duration of each phase is automatically
adjusted to compensate for varying patient
impedances. The first phase (T1) duration
is always equivalent to the second phase
(T3) duration. The interphase pause (T2)
is always a constant 0.4 ms for all patient
impedances.
The specific SCOPE waveform
characteristics for a 150 joules pulse are
listed opposite.
T 1
2000
V 1
1000
500
Volts
0
V 3
500
1000
-1 0
1
2
3
Duration (msec)
Waveform
Resistance
Voltages (volts)
(ohms)
V
1
25
1640
50
1650
75
1660
100
1670
125
1670
150
1670
175
1670
200
1670
225
1680
Adult Pad-Pak waveform specification
All values are nominal
T 3
T 2
4
5
6
7
8
9
Waveform
Duration (ms)
Tilt %
T
T
1
3
63.1
3
3
52.7
4.5
4.5
51.4
6.5
6.5
48.7
8
8
50.4
10.5
10.5
48.7
12
12
48.7
14
14
47.6
15.5
15.5
46.7
17
17
31
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