Volume Controlled ventilation has, by tradition,
delivered each breath with a constant flow and
constant inspiratory and expiratory times,
according to the settings. The SERVO-s
Ventilator System gives the possibility to the
patient to modify both flow rate and timing.
So, if a pressure drop of 3 cmH
2
O is detected
during inspiration, the ventilator cycles to
Pressure Support with a resulting increase in
inspiratory flow. When the flow decreases to
the calculated target level this flow will be
maintained until the set Tidal Volume is
delivered.
SVS-652_EN
Insp. time Pause time Exp.time
The illustrated waveform show some practical
consequences of this enhanced functionality.
• the top waveform shows the trace for a
normal Volume Controlled breath
• the second waveform shows a situation
when inspiration is prematurely interrupted
as the set tidal volume has been delivered
• the third waveform shows a situation where
the patient maintains a flow rate higher than
the calculated target value. The set Tidal
Volume has been delivered when calculated
target flow is reached and the inspiration is
prematurely interrupted
• the bottom waveform, shows a situation
where the increased flow rate is maintained
into the expiratory period. The patient will
receive a higher tidal volume than set due
to a higher flow/volume demand than
calculated.
SERVO-s VENTILATOR SYSTEM V8.0, User's Manual
63
| Ventilation, modes and functions |
5 |
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