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Interactive and limiting controls in SIMV.
The user needs to be aware that the following controls interact.
The BPM and Ti controls interact. Increasing the number of breaths per minute
can decrease the inspiratory time. Increasing the Insp time can decrease the
number of breaths per minute.
This occurs when the number of breaths per minute cannot be achieved with the
set inspiratory time or the set inspiratory time cannot be achieved with the set
number of breaths per minute.
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.
TTV (Volume targeting) of all synchronized and mechanical breaths in SIMV.
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
5mbar 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.
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