65
Operation
Setting Ventilation Modes
MMV, MMV/ASB
Mandatory Minute Volume Ventilation
Assisted Spontaneous Breathing
The overall minute volume is preset to a mandatory level,
which can be adjusted by means of the tidal volume VT
and frequency f.
The patient can breathe spontaneously, thereby
contributing a portion of the overall minute volume.
The difference between the spontaneously breathed
minute volume and the set minute volume is covered by
the mandatory ventilation strokes. Spontaneous breathing
can be assisted by ASB pressure support.
This mode is intended for patients being weaned off the
ventilator by progressively reducing the mandatory
proportion of the overall minute volume.
Set the pattern of ventilation for MMV and MMV/ASB
with the ventilation parameters:
Tidal volume »VT«
Insp. flow »Flow«
Frequency »f«
Inspiration time »Tinsp«
O2 concentration »O2«
Positive end-expiratory pressure »PEEP«
Pressure support »PASB«
Pressure rise time » «
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To set:
● Touch the appropriate screen knob.
● Adjust to the desired value = turn rotary knob.
● Confirm setting = press the rotary knob.
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MMV and MMV/ASB can be expanded with the following
ventilation parameters:
Flowtrigger – for synchronisation with attempted
spontaneous breathing by the patient.
By setting on the flow trigger level, the mandatory strokes
are synchronised with the patient's spontaneous
breathing attempts.
Spontaneous breathing activity by the patient is indicated
by the brief display of a lung symbol instead of the usual
symbol for the patient mode.
Paw
Flow
T
insp
Pmax
(configurable)
PEEP
short
rise time
long
rise time
trigger phase
V
T
Insp. Flow
t
t
1
f
ASB
pressure support
MV
sufficient spontaneous
breathing
spontaneously
breathed MV
set
MV
mandatory MV
beginning spontaneous
breathing
no spontaneous
breathing
t
087 37 207
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