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16.6.2 Interactive and limiting controls in PSV.
The user needs to be aware that the following
controls interact.
The PEEP control interacts with the PIP control.
When increasing the PEEP, the PIP will track
accordingly, if initially below the starting PEEP level.
The PIP control is limited by the PEEP. The user
cannot decrease the PIP level below the PEEP
level. The PEEP parameter control displays a
warning stating the limiting pressure.
16.6.3 TTV
plus
(Volume targeting) of all triggered
and mechanical breaths in PSV.
When the user selects TTV
plus
the PIP control
becomes the MAX PIP control. The MAX PIP
control allows the user to set the maximum pressure
at which a volume limited backup breath is
delivered. In TTV
plus
the volume that the machine
delivers is the limiting factor.
Step 9. Set the Breath Detection threshold for
Apnoea settings. The threshold is found in the flow
waveform window. (This waveform will not appear
when operating without a flow sensor).
If required, set the minute volume alarms. The alarm
thresholds are found by selecting the minute volume
graph . Once set the user can revert to
the default waveform display.
Step 10. If TTV
plus
(volume targeting) of the
triggered and mechanical breaths is required, turn
on the function and set the Max PIP and the Vte
(TTV) (Targeted Tidal Volume). The user may have
to adjust the Low Tidal volume alarm threshold.
Step 11. Set the PSV parameters if required.
Press the PSV Setup
button to
display the Pressure
Support settings
panel.
Adjust the level of
termination sensitivity
(the stop support at
%).
Press the Return button to return to the mode
panel.
16.6.4 Ventilation Without a Flow Sensor
Connected.
When the ventilator is used without the flow sensor
connected, the user will have to set the Breath
Trigger Sensitivity and the Cycle Fail Alarm.
Flow based functions, waveforms and loops will not
be displayed.
TTV
plus
will not be available.
Refer to chapter "15.2 Breath Trigger Sensitivity
(Pressure Triggering)" on page 80 for more
information.
Note: When TTV
plus
is discontinued the Max
PIP returns to the last used PIP as shown in
the MAX PIP parameter control (Not the set
MAX PIP) or with a minimum of 5 mbar above
the set PEEP. The user should ensure the PIP
is set correctly and adjust if required.
Note: The user cannot set the high and low
minute volume alarms when the flow sensor
is not connected.
Note: When TTV
plus
is discontinued the Max
PIP returns to the last used PIP as shown in
the MAX PIP parameter control (Not the set
MAX PIP) or with a minimum of 5 mbar above
the set PEEP. The user should ensure the PIP
is set correctly and adjust if required.
Caution: If the flow sensor requires removal
from the circuit whilst TTV
plus
is ON, the user
must set the MAX PIP to the measured PIP.
For further information refer to "14.1.15
Targeted Tidal Volume, Vte (TTV)" on page 70.
Note: If TTV
plus
is ON the termination
sensitivity will only come into effect if the
targeted tidal volume could not be reached.
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