121
Description
Ventilation Modes
Using BIPAP
As with IPPV, the time pattern is set using the basic setting
parameters of frequency f and inspiration time T
insp. The lower
pressure level is set with the PEEP parameter, while the upper
level is set with P
insp. When switching over from IPPV to
BIPAP mode – while retaining the time pattern – only the P
insp
setting needs to be changed.
The steepness of the increase from the lower pressure level to
the upper pressure level is controlled by the »Ramp« setting.
The effective time for the increase in pressure cannot be
greater than the set inspiratory time T
insp.
This precaution ensures that the upper pressure level P
insp
is reached safely during inspiration. The transition from
controlled ventilation via the weaning phase to fully
spontaneous breathing is achieved by a gradual reduction of
the inspiratory pressure P
insp and/or frequency f.
BIPAPAssist
Biphasic Positive Airway Pressure Assisted
Pressure-controlled, assisted ventilation
The inspiratory strokes are the same as for BIPAP, except
that the change from P
insp to PEEP is not synchronised with
expiration by the patient. The duration of P
insp depends on
T
insp. The patient can breathe spontaneously throughout the
ventilation process.
Every detected spontaneous breathing activity by the patient
triggers a synchronised inspiration stroke.
A non-synchronised inspiratory stroke is triggered by the
machine at the latest upon expiry of the inspiration time
defined by »f« and »T
insp«.
For all patients, from those unable to breathe spontaneously to
those breathing spontaneously before being weaned off the
ventilator.
012
Paw
PEEP
t
Spontaneous
breathing time
Trigger
window
Spontaneous
breathing
Mandatory
BIPAP stroke
Synchronised
BIPAP stroke
Tinsp
f
1
013
Paw
Flow
Pinsp
PEEP
slow
rise time
fast
rise time
t
t
Tinsp
Trigger window
for synchronisation
f
1
without
spontaneous breathing
with
spontaneous breathing
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