
Instructions for Use Oxylog 3000 SW 1.n
129
Principles of Operation
BIPAP
®
(PCV+)
B
iphasic
P
ositive
A
irway
P
ressure (
P
ressure
C
ontrolled
V
entilation plus)
The BIPAP
®
ventilation mode is a pressure-
controlled / time-cycled ventilation mode, in which
the patient can always breathe spontaneously.
BIPAP
®
is often described as a time-cycled
alternation between two CPAP levels.
The time-cycled change of pressure gives
controlled ventilation, which corresponds to
pressure-controlled ventilation BIPAP
®
. However,
the constant option of spontaneous breathing
allows the transition from controlled ventilation to
independent spontaneous breathing to take place
smoothly via the weaning phase, without requiring
any change of the ventilation mode. To adapt easily
to the patient's spontaneous breathing pattern, the
changeover from expiratory pressure level to
inspiratory pressure level, and also the changeover
from inspiratory pressure level to expiratory
pressure level, are synchronized with the patient's
spontaneous breathing.
The frequency of the changeover is kept constant,
even when synchronization occurs via a trigger
window with fixed time constant.
This smooth adaptation to the patient's
spontaneous breathing requires less sedation. This
means that the patient returns to spontaneous
breathing more rapidly.
As in all pressure-controlled ventilation modes, the
patient is not prescribed a fixed tidal volume VT.
The tidal volume results principally from the
pressure difference between the settings for PEEP
and Pinsp and also lung compliance.
The display of the expiratory measured tidal
volume VTe must be used to set the required
difference between the two pressure levels. Any
increase in this difference will cause an increased
BIPAP
®
ventilation stroke.
Changes in lung compliance and airways, as well
as active 'fighting' by the patient can lead to
changes in tidal volume. This is a desired effect in
this ventilation mode.
Because the tidal volume, and therefore the minute
volume, are not constant, the alarm limits for minute
volume must be adjusted with care.
03137171
Paw
PEEP
t
Trigger-
window
Spontaneous
breathing
Mandatory
BIPAP stroke
Synchronized
BIPAP stroke
T
insp
Freq.
1
P
insp
ramp
Содержание Oxylog 3000
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