Maquet SERVO-i V3.1, User Manual, Page: 38 / 283

36
Servo
…
User´s manual
US edition
Order No: 66 00 261
2
Infant Adult Universal Options
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-i 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.
The waveform illustrations above 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.
SVX-652_EN
Controlled ventilation - Volume Control