Instructions for use Oxylog 3000 plus SW 1.n 157
Description
PC-BIPAP
Pressure Controlled - Biphasic Positive Airway
Pressure
The PC-BIPAP ventilation mode is a pressure
controlled / time-cycled ventilation mode, in which
the patient can always breathe spontaneously.
PC-BIPAP can be described as a time-cycled
alternation between two CPAP levels.
The constant option of spontaneous breathing
allows the transition from controlled ventilation to
independent spontaneous breathing to take place
smoothly during the weaning phase, without
requiring any change of the ventilation mode. To
adapt easily to the patient's spontaneous breathing
pattern, the changeover from inspiratory pressure
level to expiratory pressure level and visa versa,
are synchronized with the patient's spontaneous
breathing.
The rate of the changeover is kept constant, even
when synchronization occurs via a trigger window.
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 VT results principally from the
pressure difference between PEEP and Pinsp and
from the lung compliance. An increase in this
pressure difference will cause an increased tidal
volume VT.
The measured expiratory tidal volume VTe must be
used to set the required difference between PEEP
and Pinsp.
Changes in lung compliance and in the airways, as
well as active 'fighting' by the patient can lead to
changes in the tidal volume. This is a desired effect
in this ventilation mode. Because the tidal volume
VT and the resulting minute volume MV are not
constant, the alarm limits for minute volume MVe
must be set with care.
Setting PC-BIPAP
As with VC-SIMV, the time pattern is set using the
basic setting parameters respiratory rate RR and
ventilation time ratio I:E or inspiratory time Ti.
The lower pressure level is set with the PEEP, while
the upper pressure level is set with Pinsp.
When switching over from VC-SIMV to PC-BIPAP,
the time pattern remains unchanged, but the Pinsp
needs to be set.
The steepness of the increase from the lower
pressure level to the upper pressure level is
controlled by the Slope setting.
03137171
Paw
PEEP
t
Trigger-
window
Spontaneous
breathing
Mandatory
BIPAP stroke
Synchronized
BIPAP stroke
Ti
RR
1
Pinsp slope
03137171
Paw
PEEP
t
Trigger-
window
Spontaneous
breathing
Mandatory
BIPAP stroke
Synchronized
BIPAP stroke
Ti
RR
1
Pinsp slope
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