6-10
6.7.5 P-A/C
P-A/C is pressure-assist/control ventilation mode. In P-A/C, the airway pressure rises to the
preset inspiratory pressure level within the Time of pressure rising and is held at this level
until inspiration time is expired. Then expiration is switched to. When the airway pressure is
held at the preset inspiratory pressure level, delivered gas flow changes with the resistance
and compliance of the patient’s lungs. During the inspiratory phase, when the delivered
volume exceeds the tidal volume high alarm limit, the system switches to expiratory phase
immediately. During the expiratory phase, synchronous trigger is supported. Specifically,
next mechanical ventilation can be delivered in advance when patient inspiratory effort is
detected.
The following figures show typical waveforms in P-A/C mode.
PEEP
Insp. pressure
Tslope
Paw
Flow
Time
TV exceeds the limit
Time
Tinsp
Insp. trigger level
Insp. trigger level
In P-A/C under non-NIV, you need to set the following ventilation parameters:
1. [O2%]: Oxygen concentration
2. [Pinsp]: Pressure control level of inspiration
3. [Tinsp] or [I:E]: Time of inspiration or ratio between the inspiratory and
expiratory time
4. [f]: Breathing frequency
5. [Tslope]: Time of pressure rising
6 [PEEP]: Positive end-expiratory pressure
7. [Assist]: Assisted trigger
8. [F-Trig] or [P-Trig]: Inspiration trigger level
9. [ATRC]: Automatic tube resistance compensation
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