AB.98.038
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1. Paw waveform
2.
Tinsp
3. Spontaneous breathing period
4. Trigger window
5. Pressure supported breath
6. Pinsp
7. Flow waveform
Figure 11-7 • SIMV PCV waveforms
SIMV PCV-VG mode
Synchronized intermittent mandatory ventilation with pressure control
volume guaranteed (SIMV PCV-VG) delivers a set rate of pressure
controlled breaths with a guaranteed volume to the patient. The
patient can breathe spontaneously between mandatory breaths.
Pressure support can be used to support the spontaneous breaths.
The mandatory breaths will deliver the set tidal volume using a
decelerating flow and a constant pressure. The ventilator will adjust
the inspiratory pressure needed to deliver the set tidal volume
breath-by-breath so that the lowest pressure is used. The pressure
range that the ventilator will use is between the PEEP + 2 cmH2O
level on the low end and 5 cmH2O below Pmax on the high end. The
inspiratory pressure change between breaths is a maximum of +/- 3
cmH2O. If a high airway pressure alarm is active due to the current
breath, the next breath’s target will be 0.5 cmH2O less than the
current breath’s pressure target.
SIMV PCV-VG begins by delivering a volume controlled breath. The
patient’s compliance is determined from the volume controlled
ventilation breath and the inspiratory pressure level is then
established for the next PCV-VG breath. The remaining mandatory
Aisys CS²
11-30 2067226-001
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