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Note: SIMV will continue to function as stated, but with breath rates of 20 and
above apnoea alarms will be ignored by the ventilator. Breath rates of 20BPM
and above are deemed sufficient to support the patient. Should the breath
rate be set below 20BPM the apnoea alarm is enabled.
2.5.1 SIMV with PSV
SIMV with PSV allows the user to select the termination sensitivity and pressure support
level on non SIMV breaths. Once a mechanical breath is delivered to the patient, the flow to
the infant rapidly peaks and then decelerates to the termination threshold, inspiration ends
and expiration can begin.
The following parameters must be selected: PEEP, PIP, Ti, Breath detection level,
Termination sensitivity level, Backup BPM, Apnoea delay time, O2%.
Note: The ventilator does not apply termination sensitivity to SIMV breaths.
All patient triggered, pressure supported breaths are flow terminated unless
the user sets the stop support % value to OFF.
SIMV with PSV produces time cycled, pressure limited breaths that are delivered at a set
BPM rate. Any additional patient breath attempts are pressure supported (Flow cycled,
pressure limited).
User sets the following:-
• The flow termination sensitivity
• Percentage pressure support
Supported triggered
SIMV breath
SIMV breath
breath
Un-supported
patient breath
below trigger
threshold
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