CareFusion AVEA - Bias Flow; Pres Trig; Sigh; Vsync

AVEA ventilator systems Chapter 3: Ventilator Operation 101
L2786 Rev. M
Note:
Should the patient’s inspiratory demand be sustained beyond the controlled inspiratory time plus the minimum
expiratory time with the demand system turned off, auto-triggering or double triggering may occur. This is the result
of the patient demanding more flow than available resulting in a breath trigger after the minimum expiratory time. This
may be resolved by increasing the inspiratory flow rate to meet the patients demand or turning the demand system
back on.
Sigh
The ventilator delivers sigh volume breaths when this setting is ON. A sigh volume breath is delivered every 100
th
breath
in place of the next normal volume breath.
Range: Off, On (every 100 breaths)
Sigh Volume: 1.5 times set tidal volume
Sigh Breath Interval (sec): Set Normal Breath Interval x 2 (Assist mode) or
set Normal Breath Interval (SIMV mode)
Default: Off
Sigh breaths are only available for Volume breaths in Assist and SIMV modes for adult and pediatric patients.
Bias Flow
The Bias Flow control sets the background flow available between breaths. Additionally, this control establishes the base
flow that is used for flow triggering.
Range: 0.4 to 5.0 L/min
Defaults: 2.0 L/min
Note:
To ensure adequate bias flow for inspiratory triggering the bias flow setting should be at least 0.5 liters per minute
greater than the flow trigger threshold. Consult the ventilator circuit manufacturer to ensure that bias flow setting is
sufficient to prevent overheating of the ventilator circuit.
Pres Trig
Sets the level below PEEP at which the inspiratory trigger mechanism is activated. When the pressure in the patient
circuit falls below PEEP by the set pressure trigger level, the ventilator will cycle to inspiration.
Range: 0.1 to 20.0 cmH
2
O
Default: 3.0 cmH
2
O
Vsync
Vsync breaths are:
• Controlled by pressure (inspiratory + PEEP) and volume;
• Limited by pressure (inspiratory + PEEP + margin);
• Cycled by time. Inspiratory time in Vsync is determined indirectly by setting the peak inspiratory flow. The set
inspiratory time is displayed in the message bar.