Apnoea Ventilation
For automatic switch-over to volume-controlled
mandatory ventilation if the patient stops breathing.
It can be switched on in the ventilation modes SIMV,
BIPAP, CPAP, APRV.
Evita 4 emits an apnoea alarm if during the set alarm
period »TApnoea« no expiration flow is measured or
insufficient inspiratory gas is delivered.
If breathing stops, Evita 4 emits an alarm after the set
alarm time (TApnoea > ) and starts volume-controlled
ventilation with the set ventilation parameters:
Frequency »fApnoea«
Tidal volume: »VTApnoea«
The ventilation parameters »O2« and »PEEP« correspond
to the settings effective at the time.
The inspiration time for apnoea ventilation is determined
from the set apnoea frequency »fApnoea« and a fixed
I:E ratio of 1:2.
As in SIMV, the patient can breathe spontaneously during
apnoea ventilation, and the mandatory ventilation strokes
will be synchronised with the patient's spontaneous
breathing. The apnoea ventilation frequency remains
constant.
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To set:
● Touch the »Extra settings« screen key.
● Touch the »Apnoea vent.« screen key.
● Switch on the function = touch the screen knob
marked »On«, and press the rotary knob.
● Set values = touch the appropriate screen knob,
and then turn and press the rotary control.
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Status and settings for apnoea ventilation are displayed
by Evita 4 on the "Settings" screen.
To terminate Apnoea Ventilation:
● Press the »Alarm Reset« key: the device will continue
operating in its previous ventilation mode
or
● select another ventilation mode.
For configuring the status of apnoea ventilation when
switching on the device, see page 117.
76
Operation
Apnoea Ventilation
Paw
Flow
apnoea alarm time
T
Apnoea >
Start of apnoea
ventilation
t
t
PEEP
Spontaneous breathing
with ASB pressure support
1
f
Apnoea
103 37 207
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