102 Chapter 3: Ventilator Operation Operator's manual
L2786 Rev. M
Vsync breath operation is as follows:
When Vsync is selected, a decelerating flow, volume test breath to the set tidal volume with a 40 msec pause is
delivered to the patient. The ventilator sets the target pressure at the end inspiratory pressure of the test breath or the
first pressure control breath. The next breath and all subsequent breaths are delivered as pressure control breaths.
Inspiratory pressure is adjusted automatically, based on the dynamic compliance of the previous breath, to maintain the
target volume. The maximum step change between two consecutive breaths is 3 cmH
2
O. The maximum tidal volume
delivered in a single breath is determined by the Volume Limit setting.
This test breath sequence is initiated when any of the following occur:
• Entering the Mode (Vsync)
• Changing the set tidal volume while in Vsync
• Reaching the Volume Limit setting
• Delivered tidal volume >
1.5 times the set volume
• Flow termination of the test breath
• Exiting Standby
• Activation of any of the following alarms
- High Peak Pressure Alarm
- Low Peak Alarm
- Low PEEP Alarm
- Patient Circuit Disconnect Alarm
- I-Time Limit
- I:E Limit
Vsync is only available for adult and pediatric patients.
Note:
If flow cycling is active during a PRVC or Vsync breath flow cycling of the breath can only occur if the target tidal
volume has been delivered. This allows for expiratory synchrony while assuring delivered tidal volume.
Note:
The Peak Flow control sets the flow rate, which is used by the ventilator for the test breath only. The ventilator uses
the Peak Flow setting and Inspiratory Pause to determine the maximum inspiratory time during Vsync ventilation.
Vsync Rise
With Vsync active, this control sets the slope of the pressure rise during the volume breath. It is a relative control ranging
from fast (1) to slow (9).
Range: 1 to 9
Default: 5
PSV Rise
This control sets the slope of the pressure rise during a pressure-supported breath. It is a relative control with a range
from fast (1) to slow (9).
Range: 1 to 9
Default: 5
To Next Page
Loading...
