5.5 Pressure Control
5.5.1 Functional description Pressure
Control
The Pressure Controlled mode is a controlled
breathing mode.
Breaths are delivered mandatorily at a preset
pressure level, causing a decelerating flow
pattern.
SVS-5038_XX
The following parameters are set:
1. PC (Pressure Control level) above PEEP
(cmH
2
O)
2. Respiratory Rate (b/min)
3. PEEP (cmH
2
O)
4. Oxygen concentration (%)
5. I:E ratio / Insp. time
6. Inspiratory rise time (%/s)
7. Trigg. Flow / Trigg. Pressure
SVS-5039_XX
The delivered volume is dependent upon the
pressure above PEEP, lung compliance and
resistance in the patient tube system and
airways. This means that the Tidal Volume can
vary. Pressure Controlled mode is preferred
when there is leakage in the breathing system
e.g. due to uncuffed endotracheal tube or in
situations when the maximum airway pressure
must be controlled. The flow during inspiration
is decelerating. The patient can trigger extra
breaths. If the patient tries to exhale during
the inspiration, the expiratory valve will allow
exhalation as long as the pressure is more
than 3 cmH
2
O above the set pressure level.
As the delivered tidal volume can vary it is very
important to set alarm limits for Minute Volume
to adequate levels.
SERVO-s VENTILATOR SYSTEM V8.0, User's Manual
67
| Ventilation, modes and functions |
5 |
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