3-26
Chapter 3: Ventilator Operation
Operator's manual
Figure 3–18: PSV Waveform
In Figure 3–18 breath number 1 represents the flow tracing which occurs when the PSV level is insufficient to meet the patient demand. Breath two shows resolution after increasing the PSV level slightly. (Pressure tracing will show a similar appearance).
Non-Invasive Ventilation The ventilator can perform non-invasive ventilation with a standard dual limb circuit. Leak compensation should be turned on when using this feature. To turn leak compensation on, use the touch screen control displayed in the Ventilator Set-Up Screen.
Note: Non invasive ventilation requires the use of a snug fitting mask with no bleed holes. Excessive leaks around the mask may result in false triggering of the ventilator or assertion of disconnect alarms.
Apnea Backup Ventilation Apnea Backup Ventilation is available in Assist Control, SIMV, CPAP/PSV and APRV / BIPHASIC modes.
Apnea Backup in Assist Control or SIMV When in Assist Control or SIMV modes, the apnea backup rate is determined by the operator-set mandatory breath Rate or the Apnea Interval setting (whichever provides the highest respiratory rate). When the Apnea Interval setting (found in the Alarm Limits window) determines the backup rate, the ventilator will continue to ventilate at this rate until the apnea has been resolved. All other controls for apnea ventilation in Assist Control and SIMV are set when the primary control values for these modes are selected. Apnea ventilation will terminate when one of the following criteria are met: •
The patient initiates a spontaneous breath
•
A manual breath is delivered
•
The mandatory respiratory rate is increased above the apnea interval setting.
Note: The apnea interval timer is suspended during a Patient Circuit Disconnect Alarm.
L2786