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Machine Volume
The Machine Volume (Mach Vol) control sets the minimum tidal volume delivered as the
control is activated in a pressure control breath. This control is always used with the time
cycling criterion in pressure control ventilation. The machine volume is circuit compliance
compensated in adult and pediatric applications.
Once you set the machine volume, the ventilator calculates the decelerating inspiratory
flow required to deliver the machine volume in the set inspiratory time. When a pressure
control breath delivers and peak flow decelerates to this calculated peak inspiratory
flow, if the machine volume has not been met, the ventilator automatically transitions to
a continuous flow until the machine volume has been delivered. Once the set machine
volume has been delivered, the ventilator cycles into exhalation. Upon meeting or
exceeding the machine volume or pressure control breath delivery, the ventilator
completes the breath as a normal pressure control breath.
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