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2076152-001
11 Specifications and theory of operation
level on the low end and 5 cmH2O below Pmax on the high end. The
inspiratory pressure change between breaths is a maximum of +/- 3
cmH2O. If a high airway pressure alarm is active due to the current
breath, the next breath's target will be 0.5 cmH2O less than the
current breath's pressure target.
SIMV PCV-VG begins by delivering a volume controlled breath. The
patient's compliance is determined from the volume controlled
ventilation breath and the inspiratory pressure level is then
established for the next PCV-VG breath. The remaining mandatory
breaths will be pressure controlled with a guaranteed volume at the
inspiratory limb.
A portion of the exhalation phase is defined as the trigger window. If
a spontaneous breath is detected in this window, a new mandatory
PCV-VG breath is initiated. If a spontaneous breath is detected
outside of this window, support for this breath is provided according
to the set pressure support. The remainder of the trigger window is
added to the next non-triggering phase.
The inspiratory phase of supported breaths will end if the set End of
Breath is reached, if the airway pressure exceeds (PEEP + Psupport
+ 3 cmH2O). Supportive breaths have a maximum inspiratory time of
4 seconds.
SIMV PCV-VG mode settings:
•
TV
•
RR
•
Flow Trigger
•
Psupport
•
PEEP
•
Tinsp
•
Pmax
•
Trig Window
•
End of Breath
•
Rise Rate
•
PSV Rise Rate
11-31
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