Pressure-regulated Volume Controlled SIMV (SIMV with PRVC)
- Volume Controlled
- Time-Triggered – and the pressure support breaths are flow-triggered
- Pressure-limited, or rather “Pressure Regulated”
- ….Flow-limited (but doesn’t have to be flow-limited)
- Time-Cycled AND Flow-Cycled
The first breath tests for compliance; it’s a low-volume low-pressure calibration breath. A compliance is calculated, and from this value, a pressure is calculated which would be required to deliver the controlled target volume.
The next breath is delivered at this calculated pressure. If the controlled target volume is exceeded, the ventilator adjusts the flow rate, so that with the next breath the pressure is slightly lower.
The subsequent breaths are delivered at the decreased pressure.