Datex-Ohmeda Aespire View, User'S Reference Manual

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Aespire View
10-22
M1132382
PCV-VG
1. Paw waveform
2. Tinsp
3. Texp
4. Variable pressure to deliver desired TV
5. PEEP
6. Flow waveform
7. TV
Figure 10-8 • PCV-VG waveforms
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 settings include:
•
Pinsp - sets the target airway pressure.
• RR - sets the rate of mechanically driven breaths.
• I:E - sets the amount of inspiration to expiration ratio.
• PEEP - sets the positive end expiratory pressure.
• Pmax - sets the maximum airway pressure.
• Rise Rate - sets the amount of time to attain Pinsp.
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