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The inspiratory pressure for subsequent breaths is adjusted breath-to-breath. The pressure
adjusts separately for time triggered breaths, patient triggered breaths, apnea backup
breaths and manual breaths to maintain monitored expired tidal volume.
PRVC Mode
In pressure regulated volume control (PRVC) breaths, the pressure level modulates up or
down to achieve a pre-set tidal volume. Breaths are controlled by pressure (inspiratory +
PEEP) and volume, limited by pressure (inspiratory + PEEP) and cycled by time.
When PRVC is selected, the ventilator delivers a decelerating flow, volume controlled test
breath to the set tidal volume with a 40 msec pause. It sets the target pressure at the end
inspiratory pressure for the first pressure control breath. The next breath and all subsequent
breaths deliver as pressure control breaths.
Inspiratory pressure adjusts automatically to maintain the target volume based on the
dynamic compliance of the previous breath. The maximum step change between two
consecutive breaths is 3 cm of water pressure. The maximum tidal volume delivered
in a single breath is determined by the Volume Limit setting.
The test breath sequence initiates when:
• Entering the PRVC mode
• Changing the set tidal volume while in PRVC
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