Tecno-gaz TECNOHEART plus, User Manual

Page: 45 / 53

40
Defibrillation Waveform
Parameters of
the waveform
Defibrillation Waveform
The parameters of the waveform are adjusted automatically
based on the patient's defibrillation impedance. In the
diagram on the left, A is the amplitude of beat 1 and B is the
amplitude of beat 2 of the waveform, C is the interval between
beats, I
p
is the peak current, and I
f
is the final current.
The AED delivers electric shocks to charge impedances be
tween 25 and 175 ohm. The duration of each waveform p
ulse is adjusted dynamically based on the delivered shock,
to compensate for variations in patient impedance, as illus
trated below:
Defibrillation for Adults
Shock
Resistanc
e
( Ω )
Pulse
ampl
itude
1
(ms)
Pulse
amplitude 2
(ms)
Energy
Delivered
(J)
25 3.3 3.1 195
50 4.7 4.1 190
75 6.7 4.7 185
100 8.3 5.9 195
125 9.7 6.7 190
150 11.3 7.9 185
175 11.7 8.7 180
Defibrillation for paediatric patients
Shock
Resistanc
e
( Ω )
Pulse amplitu
de 1 (ms)
Pulse amplit
ude 2 (ms)
Energy
Deliver
ed
(J)
25 3.3 3.1 51
50 4.7 4.1 50
75 6.7 4.7 49
100 8.3 5.9 51
125 9.7 6.7 50
150 11.3 7.9 49
175 11.7 8.7 47
Shock control Controlled by the patient analysis system for automatic
operation.
Shock Time Normally < 12 seconds
Shock Analysis
Time Normally < 13 seconds
Disarm After the AED advises a shock, AED continues to monitor the
patient ECG rhythm during a maximum of 20 seconds until the
shock button is pressed. If the ECG rhythm changes to a non-
shockable rhythm, the AED will disarm. If the shock button is
not pressed during 20 seconds, the AED will disarm.