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2076152-001
11 Specifications and theory of operation
An apnea backup mode is provided if the patient stops breathing.
When setting this mode the clinician adjusts the inspiratory pressure
(Pinsp), respiratory rate (RR), and the inspiratory time (Tinsp). As
long as the patient is triggering the ventilator and the apnea alarm
does not activate, the patient will get pressure-supported breaths
and the ventilator will not deliver machine breaths.
If the patient stops triggering the ventilator for the set apnea delay
time, the apnea alarm will activate and the ventilator will
automatically switch to the backup mode that is SIMV PCV. Once in
this mode the ventilator will begin delivering machine pressure
controlled breaths at the inspiratory pressure level, inspiratory time,
and rate that the user has set. If, during this time, the patient takes
spontaneous breaths in between the machine breaths, the patient
will receive pressure supported breaths.
PSVPro mode settings:
•
Psupport
•
PEEP
•
Trig Window
•
Flow Trigger
•
End of Breath
•
Pmax
•
Backup Time
•
Pinsp
•
RR
•
Tinsp
•
Rise Rate
•
Exit Backup
1
2
T
I
1.
Paw
2.
PEEP
3.
Time
Figure 11-13 • PSVPro waveform
When the ventilator switches to the backup mode, the 'Backup Mode
active' alarm shows until PSVPro is reinstated or until another
ventilation mode is selected. PSVPro mode automatically resumes
when the ventilator registers the number of consecutive patient-
triggered breaths set for the Exit Backup setting. The factory default
3
11-33
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