GETINGE GROUP Maquet SERVO-s VENTILATOR SYSTEM V7.0 User Manual page 91

6.7.2 PRESSURE SUPPORT IN DETAIL
SVS-9004_XX
1. Pressure Support assures that a preset
inspiratory pressure level is constantly
maintained upon patient effort.
2. The preset pressure level is controlled by
the ventilator, while the patient determines
frequency and inspiration time.
3. Inspiration starts when the patient triggers
a breath, gas flows into the lungs at a
constant pressure. Since the pressure
provided by the ventilator is constant, the
flow will decrease until the Inspiratory
Cycle-off is reached.
SERVO-s VENTILATOR SYSTEM V7.0, User's Manual
1
Expiration starts:
a. When the inspiratory flow decreases below
a preset fraction of the inspiratory peak
flow (Inspiratory cycle-off)
b. If the upper pressure limit is exceeded.
c. If the maximum time for inspiration is
exceeded.
d. If the flow drops to a flow range between
25% of the peak flow and lower limit for
Inspiratory Cycle-off fraction level and the
spent time within this range exceeds 50%
of the time spent in between the start of
the inspiration and entering this range.
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