94 Chapter 3: Ventilator Operation Operator's manual
L2786 Rev. M
Note:
In adult and pediatric ventilation, a minimum of 2 cmH
2
O of PSV above PEEP is applied even when the control is set to
zero.
Note:
IF PSV level is insufficient to meet patient demand, premature termination of the breath may occur with auto-
triggering. In these cases the PSV level should be increased slightly.
Figure 3–27: PSV Waveform
In Figure 3–27 breath number 1 represents the flow tracing which occurs when the PSV level is insufficient to meet the
patient demand. Breath two shows resolution after increasing the PSV level slightly. (Pressure tracing will show a similar
appearance).
Note:
Monitored airway pressures (inspiratory) will be higher than set when AAC is active. With an inspiratory pressure
setting of zero, AAC will still provide an elevated airway pressure, to compensate for the resistance of the endotracheal
tube.
Positive End Expiratory Pressure (PEEP)
PEEP is the pressure that is maintained in the patient circuit at the end of exhalation.
Range: 0 to 50 cmH
2
O
Defaults: 6 cmH
2
O (Adult/Pediatric)
3 cmH
2
O (Neonate)
Note:
The ventilator will not allow the operator to set a Peak Inspiratory Pressure (Insp Pres or PSV + PEEP, or baseline
pressure in APRV / BiPhasic, greater than 90 cmH
2
O). The ventilator will deliver an on screen Pop-Up Message stating
that the Ppeak > 90 cmH
2
O. The operator must change the Inspiratory Pressure and or PEEP setting to limit the Ppeak
to less than or equal to 90 cmH
2
O.
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