Machine Volume (Mach Vol) - CareFusion AVEA Operating Instructions Manual

AVEA ventilator systems

Machine Volume (Mach Vol)

The Machine Volume control sets the minimum tidal volume delivered from the ventilator when the control is activated
in a pressure control breath. This control is always used with the time cycling criterion in pressure control ventilation.
Machine volume is circuit compliance compensated in adult and pediatric applications.
Range:
Normal:
Defaults:
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 is delivered and Peak Flow decelerates to
this calculated peak inspiratory flow, if the Machine Volume has not been met the ventilator will automatically transition to
a continuous flow until the Machine Volume has been delivered. Once the set Machine Volume has been delivered the
ventilator will cycle into exhalation. When the Machine Volume is met or exceeded during delivery of the pressure
control breath, the ventilator will complete the breath as a normal Pressure Control breath.
During this transition in flow, the Inspiratory Time will remain constant and the Peak Inspiratory Pressure will increase to
reach the set Machine Volume. The maximum Peak Inspiratory Pressure is determined by the High Peak Pressure
alarm setting.
Note:
Pmax is disabled when Machine Volume is set. In the event Flow Cycling is active in Pressure Control the ventilator
will not Flow Cycle until the Machine Volume has been met. Machine Volume must be set to zero to change patient
size.
To set 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:
Adjust the peak inspiratory pressure to reach the desired tidal volume.
•
Select Vdel as one of the monitored parameters. Read the Vdel (uncorrected Tidal Volume delivered from the
•
machine) during a pressure control breath.
Set the Machine volume to or slightly below the Vdel measurement. This will set the machine volume to a level
•
that will provide more consistent tidal volume delivery in the case of slight decreases in lung compliance.
CAUTION
If a proximal flow sensor is used it must be attached at both the patient wye and at the ventilator connection to
ensure proper function of the AVEA.
L2786 Rev. M
Chapter 3: Ventilator Operation
0.10 to 2.50 L (Adult)
25 to 500 ml (Pediatric)
2.0 to 300.0 ml (Neonate)
0 L (Adult)
0 ml (Pediatric)
0 ml (Neonate)
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