AVEA ventilator systems Chapter 4: Monitors, Displays and Maneuvers 119
L2786 Rev. M
Start / Stop
The maneuver shall begin when the START key is actuated. The maneuver shall be
immediately terminated when the STOP key is actuated, a patient effort is detected or the
maneuver tidal volume has been delivered and normal ventilation will resume.
Note:
The initiation of a Pflex Maneuver is delayed by two factors. The total delay is equal to 25% of the breath interval plus
the PEEP Equilibration time set. The PEEP Equilibration time has a range of 0–30 seconds. If the mandatory breath
rate is 10 bpm, the breath interval is therefore 6 seconds and the delay to initiate Pflex is 1.5 seconds plus the PEEP
equilibration time set. At the default PEEP Equilibration time of 1 second, the total delay is 2.5 seconds in this example.
If the mandatory breath rate is set to 1 bpm, the breath interval is 60 seconds and the delay to initiate Pflex in this
worst-case scenario is 15 seconds, plus the PEEP Equilibration time.
Upper P
flex
and Lower P
flex
determination
Once the maneuver tidal volume has been delivered the ventilator will cycle into exhalation. At the end
of exhalation, the P
AW
/ Vol loop will freeze automatically, the upper and lower inflection points, as well as
the delta P
flex
volume, will be calculated and displayed. The ventilator will return to normal ventilation at
the current ventilator settings.
The user can, should they choose to do so, override the P
flex
values by moving the P
flex
indicators to a
new point along the PV loop and pressing the appropriate set key. The corresponding P
flex
values and
delta P
flex
volume change to represent values based on the current position of the indicators. The
ventilator will store up to four PV loops and their respective inflection points simultaneously.
Note:
Once the values have been redefined by the operator the original values cannot be restored.
Alarms
All currently available alarms shall be active during a P
flex
maneuver except Apnea Interval and I-Time Limit.
To Perform a Pflex Maneuver
The Pflex maneuver allows the clinician to determine opening pressures of the lung during a slow flow volume controlled
breath. Because this maneuver is performed at a slow inspiratory flow rate the effects of respiratory system resistance
are minimized.
Note:
Performance of the Pflex maneuver requires a passive patient. In the event that a patient effort is detected the
ventilator will abort the maneuver and deliver a patient effort detected message while simultaneously returning to
normal ventilation at the current settings.
From the Maneuvers Screen select Pflex
The Pflex maneuver screen allows the operator to set:
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