determined by the selections made in the ventilator and they won't be affected by the
changes of the right side (compliance and resistance). As it will be seen, the Pressure
Controlled (PCV) and Pressure Support (PSV) modes use the pressure as the control
variable.
If the change of volume (VT) is maintained stable when the compliance or the resistance
change and simultaneously the flow are measured directly (pneumotachograph), then the
ventilator is classified as a flow controller.
The Volume mode of the NEUMOVENT Graph Ventilator uses the flow as the control
variable. The Pressure Support mode with Volume Assured is able to change, in oneself
inspiratory phase, from pressure controller to flow controller.
4. Breathing phases variables
In each one of the ventilation phases (inspiration and expiration), a particular variable is
measured and used to begin, sustain and conclude the phase. In this context, pressure,
volume, flow and time are referred as the phase variables.
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