• Pinsp
•
RR
• Tinsp
• Rise Rate
• Exit Backup
AB.91.041
1
2
3
T
I
1. Paw
2.
PEEP
3. Time
Figure 11-9 • 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
setting for Exit Backup is 2. When Exit Backup is set to Off, the user
must reselect the PSVPro mode to reactivate PSVPro. Upon
returning to PSVPro the ventilator immediately begins providing
pressure supported breaths to the patient using the established
settings.
Spontaneous breaths that occur during this mode are indicated by a
color change in the waveform.
CPAP + PSV mode
Continuous positive airway pressure + pressure support ventilation
mode is used on spontaneously breathing patients. This mode of
ventilation provides a constant support pressure once the ventilator
senses that the patient has made an inspiratory effort. In this mode,
the clinician sets the Pressure support (Psupport) and PEEP levels.
The patient establishes the rate, inspiratory flow, and inspiratory
time. The tidal volume is determined by the pressure, lung
characteristics, and patient effort.
CPAP + PSV uses an inspiration termination level that establishes
when the ventilator will stop the pressure supported breath and cycle
to the expiratory phase. The inspiration termination level is user
adjustable from 5 to 75%. This parameter sets the percent of the
peak inspiratory flow that the ventilator uses to end the inspiratory
phase of the breath and to cycle into the expiratory phase. If the
11 Specifications and theory of operation
2067226-001 11-33
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