Operation
52
Apnoea ventilation
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 2 dura emits an apnoea alarm if during the set alarm
period »T
Apnoea« no expiration flow is measured or insufficient
inspiratory gas is delivered.
If breathing stops, Evita 2 dura emits an alarm after the set
alarm time (T
Apnoea >) and starts volume-controlled ventilation
with the set ventilation parameters:
Frequency »f
Apnoea«
Tidal volume »VT
Apnoea«
The ventilation parameters »O
2« and »PEEP« correspond to
the settings effective at the time.
The inspiration time for apnoea ventilation is determined from
the set apnoea frequency »f
Apnoea« 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 apnoea ventilation:
● Press menu button »Settings«.
Display:
● Select screen key »Apnoea Vent.« = turn rotary knob.
Switch on apnoea ventilation = press rotary knob. The
"LED" in the screen key changes from green to yellow =
apnoea ventilation is on.
● Select field »VTApnoea« = turn rotary knob,
activate = press rotary knob.
● Set values = turn rotary knob,
confirm = press rotary knob.
● Select, set and confirm »fApnoea« accordingly.
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To terminate apnoea ventilation:
● Press »Alarm Reset« key. The machine will continue
operating in its previous ventilation mode.
or
select another ventilation mode.
See page 80 for configuration of the apnoea ventilation status
when starting the machine.
025
Paw
Flow
apnoea alarm time
T
Apnoea >
Start of apnoea
ventilation
t
t
PEEP
Spontaneous breathing
with ASB pressure support
1
f
Apnoea
509
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