388 EN MEDUCORE Standard
2
WM 68401 04/2021
18 Technical data
18.18.2 Accuracy of the delivered energies
The shock pulse is generated on a current-controlled basis
(I = const.) and for a fixed duration (t = const.). Patient impedance
is the only variable. The shock pulse energy is the result of current,
pulse duration and patient impedance. Since current and pulse
duration are specified, the shock pulse can be individually adapted
for each patient.
The current control of the shock pulse ensures that patients with
low impedance receive the same current as patients with high
impedance since it is not energy but current which is key for
defibrillation. Furthermore, current control prevents patients with
a low patient impedance from being shocked with an overly high
current.
Due to current control and the dependency on patient impedance
of the energy delivered, it is possible that the energy delivered will
deviate from the selected energy (see table below):
*Selected energy differs from delivered energy due to the laws of
physics. Delivered energy depends on patient impedance (see also
IEC 60601-2-4:2010 Chapter 201.12.1 and Annex AA).
Selected
energy in J
Energy delivered as a function of patient impedance*
Accuracy
of energy
delivered
Patient impedance in Ω
25 50 75 100 125 150 175 200
1 0.4 1 2.5 2.4 2 1.8 1.7 1.6 ±3 J
5 2.6 5.4 7.8 6.8 6 5.4 4.9 4.4 ±3 J
10 5.2 10.8 13.2 11.6 10.2 9.3 8.4 7.6 ±3 J
15 7.8 15.7 20.4 18.4 16.5 15.3 13.6 12.4 ±3 J
20 10.2 19.9 25.6 23.4 21 19.2 17.5 16 ±15 %
30 15.4 30.2 42.1 40.2 36.7 33.9 31.1 28.8 ±15 %
40 19.8 39 51.4 49.8 46 42.3 38.8 36.4 ±15 %
50 26 50.2 72.1 72 65.7 60.3 55.6 51.6 ±15 %
75 38.4 73.8 106.6 107.7 100.7 92.9 86 79.9 ±15 %
100 53 102 135.6 134.1 123.2 113.3 104.9 96.3 ±15 %
120 63.6 122.3 153.7 148.3 137.2 127.1 116.8 107.9 ±15 %
150 79.6 152 181.7 170.9 157.7 146.3 134.7 126.7 ±15 %
200 128.9 201.2 211.6 208.3 205.6 196 187.5 179.5 ±15 %
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