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Anaesthesia ventilation
IPPV
Automatic device compliance correction
Only set the desired patient tidal volume!
The compliance of the breathing system and of the hoses
used are established by the apparatus during the self-test
or during a manual leakage test. The reduction in tidal
volume due to system compliance is then corrected
automatically during ventilation so that the patient actually
receives the set tidal volume.
The leakage test should therefore be repeated whenever
changes have been made in the hoses –
The patient must always be disconnected and the
system set to »Standby« before starting the leakage
test ! (see page 44)
A detailed description of automatic compensation of
the system compliance can be found in the Annex on
page 167.
Ventilation with pressure limitation
When the set maximum ventilation pressure Pmax
is reached, inspiration is adjusted so that the pressure
remains constant up to the end of inspiration
(see page 37).
The set tidal volume is not fully applied in this case!
1 Display on ventilator:
Pressure limitation
2 The bar graph on the ventilator does not reach 100%.
If the pressure increases by more than 5 mbar above
the maximum ventilation pressure P
the patient coughs, inspiration is immediately stopped
and expiration starts.
Limit settings
– P
, PEEP
max
The minimum difference between P
10 mbar. As from software version 7.n, this minimum
difference is reduced to 5 mbar. Settings that result in
a smaller pressure difference are not permitted by the
system. The minimum Pmax setting remains 10 mbar,
as in previous versions.
– Max. inspiratory flow
The tidal volume, frequency, I:E ratio and inspiratory
pause time cannot be set to values resulting in an
inspiratory flow of more than 75 L/min.
– Max. minute volume
The tidal volume and frequency cannot be set to
values resulting in a minute volume of more than
25 L/min.
34
, e.g. because
max
and PEEP is
max
MAN
2
SPONT
IPPV
SIMV-Mode ?
1
P
max
T
:T
IP
I
SIMV
PCV
V
f
T
:T
PEEP
f
IMV
T
IPPV
I
E
P
PCV
Flow
TEST
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