154 Guide to volume guarantee
fabian HFO | SW 5.1.x
Ref: 113003.EN / Date 2020-02-10
16.4 Setting up the ventilator PSV+VG
If Volume Guarantee is added to PSV, the Ventilator automatically is adjusting the PPSV level
necessary
to maintain the preset Target Volume. In case of an Apnea, the Ventilator will start cycling at a preset
rate and PBackup. As soon as spontaneous activity restarts, the backup stops.
Settings to start with:
I-Flow 8 L/min
E-Flow 8 L/min
Frequency (Rate) between 30 to 40 BPM – Safety backup rate in case of apnea
Inspiratory time between 0.3s to 0.4s – Used for backup and as max I-Time
Pbackup between 16 to 18 cmH
2
O used during apnea backup ventilation
PBackup PPSV 16 to 18 cmH
2
O
PEEP 4 to 6 cmH
2
O
The minimum pressure difference between PEEP and PPSV is always 2 cmH
2
O and P
PSV
is limited
not to exceed the set P
insp
.
PSV breaths and Apnea backup breaths are Volume Targeted Breaths in this mode.
The delay to start backup Ventilation is set with the Apnea time in Alarm Limit screen.
If Apnea is set to OFF → backup starts after E-time.
In PSV+VG mode, the patient controls the onset of Inspiration as well as the end of Inspiration,
offering a total synchrony with patients breathing pattern.
If patient lung compliance is improving, the Ventilator automatically is using the Lowest Pressure,
necessary to maintain the Preset Target Volume.
In case of a respiratory fatigue and a ceasing Inspiratory effort, the ventilator automatically provides
an Apnea Backup Ventilation with the preset parameters for I-time, Frequency and Pbackup.
The delay for the onset of the Apnea Backup Ventilation is set in the Alarm screen, by setting the
Apnea Delay Time. If Apnea Backup Ventilation is set to OFF, the ventilator starts Apnea Backup
Ventilation immediately after E-time, otherwise after Preset Apnea Time.
We recommend using a delay time to prevent the ventilator from starting unnecessarily and
interfering with patient’s breathing pattern.
The apnea backup breaths are volume guaranteed breaths.
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