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PCV-VG mode
11-24
In PCV-VG, a tidal volume is set and the ventilator delivers that
volume using a decelerating flow and a constant pressure. The
ventilator will adjust the inspiratory pressure needed to deliver the set
tidal volume breath-by-breath so that the lowest pressure is used.
The pressure range that the ventilator will use is between the PEEP +
2 cmH2O 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.
This mode will deliver breaths with the efficiency of pressure
controlled ventilation, yet still compensate for changes in the patient's
lung characteristics. PCV-VG begins by first delivering a volume
breath at the set tidal volume. The patient's compliance is determined
from this volume breath and the inspiratory pressure level is then
established for the next PCV-VG breath.
PCV-VG mode settings:
•
TV
•
RR
•
I:E
•
PEEP
•
Pmax
•
Rise Rate
1. Paw waveform
2. Tinsp
3. Texp
4. Variable pressure to deliver desired TV
5. PEEP
6. Flow waveform
7. TV
Figure 11-6 • PCV-VG waveforms
M1145956
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