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TTV (volume targeting) all mechanical breaths in CMV.
When the user selects TTV 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 the volume that the machine delivers is
the limiting factor.
Note: On discontinuing TTV the ventilator defaults to a safe PIP level of 5
mbar above the set PEEP level, irrespective of what the user has set. The
User will then have to reset the PIP to the required level.
The inspiratory time Ti will change to Max Ti as the delivered volume limits the
machine breath rather than the inspiratory time. The actual inspiratory time (Ti
Meas.) will be displayed in the lung mechanics and measurement panel and
parameter window.
Step 6. 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.
Note: The user cannot set the high and low minute volume alarms when the
flow sensor is not connected.
Step 7. If TTV (volume targeting) of the mechanical breaths is required, turn on the
function and set the Max PIP and the Tidal Vol (Targeted Tidal Volume). The user
may have to adjust the Low Tidal volume alarm threshold.
Note: When TTV is discontinued the Max PIP returns to 5mbar above the set
PEEP.
16.4.2 Ventilation Without a Flow Sensor Connected.
When the ventilator is used without the flow sensor connected, the user will have
to set the Cycle Fail Alarm.
Flow based functions, waveforms and loops will not be displayed.
TTV will not be available.
Refer to chapter "15.2 Breath Trigger Sensitivity (Pressure Triggering)" on page
151 for more information.
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