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16.3.3 TTV
plus
(Volume targeting) of backup
breaths in CPAP.
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 7. 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).
Step 8. Set the High and Low Tidal Volume alarm
thresholds. These thresholds are found in the Tidal
Volume waveform window. (This waveform will not
appear when operating without a flow sensor).
Step 9. 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 backup
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.
16.3.4 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.
16.3.5 Ventilation with the Apnoea alarm turned
“OFF”
The user can turn off the Apnoea Alarm via the
Apnoea setup panel.
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.
Low
Tidal
High
Tidal
Volume
Volume
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.
Warning: Disabling the alarm in CPAP has
been allowed, so the user can use the
ventilator non-invasively. We recommend that
the ventilator should not be used invasively
with the apnoea alarm/backup breaths
features disabled.
Warning: The user must use an alternative
method of detecting an apnoeic episode,
whether ventilating invasively or non
invasively with the Apnoea alarm turned
“OFF”.
Note: The Apnoea alarm is automatically
enabled when the flow sensor is connected
and calibrated or if the user leaves CPAP
mode and enters any other ventilatory mode.
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