Description
105
Using BIPAP
As with SIMV, 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 Pinsp.
When switching over from volume controlled ventilation to
BIPAP mode – while retaining the time pattern – only the Pinsp
setting needs to be changed.
The steepness of the pressure increase is controlled by the
»FlowAcc« setting.
During the lower pressure level phase, spontaneous breathing
can be assisted by ASB.
The steepness of the pressure increase to ASB pressure
∆ PASB above PEEP is also controlled by the »FlowAcc«
setting.
The transition from controlled ventilation via the weaning
phase to fully spontaneous breathing is achieved by a
gradual reduction of the inspiratory pressure Pinsp and/
or frequency f.
Automatic leakage compensation
Savina determines the difference between the inspiratory
metered flow and the expiratory measured flow. The difference
provides an indication of the extent of leakage and is
designated leak minute volume, MVleak. The leak minute
volume MVleak is taken into account for trigger detection, for
optimum synchronisation of the ventilator with the patient.
Automatic leakage compensation for trigger detection
In order to synchronize with the patient’s efforts to breathe in
and out, Savina detects volume and flow values caused by the
patient. In order to optimize synchronisation, the measured
flow values are automatically corrected to take account of the
leakage flow, up to a maximum of 10 L/min.
Monitoring leakage
In »Tube« mode if Savina detects a major leak in the system,
the message »! Leakage« appears. In this case the tube and
patient hose system connections should be checked for
tightness.
026 37388
Paw
PEEP
t
Trigger
window
spontaneous breathing
mandatory
BIPAP stroke
synchronised
BIPAP stroke
Tinsp
f
1
FlowAcc
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