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During this transition in flow, the inspiratory time remains constant and the Ppeak increases
to reach the set machine volume. The maximum Ppeak is determined by the High Peak
Pressure alarm setting.
Note: Pmax disables when the machine volume is set. If flow cycling is active in pressure
control, the ventilator does not cycle the flow until meeting the machine volume. The
machine volume is circuit compliance compensated in adult and pediatric applications.
To set the machine volume in adult and pediatric applications (with circuit compliance
compensation active), simply set the minimum desired tidal volume.
In neonatal applications with proximal flow sensor in use:
1. Adjust the peak inspiratory pressure to reach the desired tidal volume.
2. Select Vdel as one of the monitored parameters. Read the Vdel (uncorrected tidal volume
delivered from the machine) during a pressure control breath.
3. Set the machine volume to or slightly below the Vdel measurement. This sets the machine
volume to provide more consistent tidal volume delivery for slight decreases in lung
compliance.
Note: To protect against larger changes in lung compliance, the machine volume
should be set higher and volume limit should be added.
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