Maquet SERVO-air, Руководство пользователя

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5.3 Pressure Regulated Volume Control (PRVC)
Pressure Regulated Volume Control (PRVC):
• combines the advantages of Volume
Control and Pressure Control by delivering
a preset tidal volume with a decelerating
inspiratory flow at a preset respiratory rate
• maintains the lowest possible constant
pressure throughout inspiration
• the inspiratory pressure of a breath will
never exceed 5 cmH
2
O below the upper
pressure limit
The ventilator system can be configured so
that either tidal volume or minute volume is
set.
1 2 3 4
5 6 7
The following parameters are set:
1. Oxygen concentration (%)
2. PEEP (cmH
2
O)
3. Respiratory rate (b/min)
4. Tidal volume (ml) or minute volume (l/min)
5. I:E ratio or Inspiration time (s)
6. Inspiratory rise time (% or s)
7. Trigger
Refer to section Settings on page 43.
The ventilator system delivers a preset tidal
volume. The pressure is automatically
regulated to deliver this volume but limited to
5 cmH
2
O below the set upper pressure limit.
The flow during inspiration is decelerating. The
patient can trigger extra breaths.
5 cmH
2
O
The first breath is a volume controlled test
breath with the pause time set to 10 %. The
measured pause pressure of this breath is then
used as the pressure level for the following
breath.
Following the initial breath, the ventilator
system calculates and continuously regulates
the pressure needed to deliver the preset tidal
volume.
An alarm is activated if the set target volume
cannot be delivered due to the fact that the
pressure required to deliver it is higher than
5 cmH
2
O below the set upper pressure limit.
Refer to section Leakage compensation on
page 96.
SERVO-air Ventilator System v2.2, User's Manual
61
| Ventilation modes | 5 |