AVEA ventilator systems Chapter 7: Alarms and Indicators 175
L2786 Rev. M
Note:
Maximum Circuit Pressure Limit:
The ventilator has an independent mechanical pressure relief valve, which limits the maximum pressure at the patient
wye to 125 cmH
2
O.
Extended High Peak Pressure
This is a high priority audible/visual alarm. EXT HIGH P
PEAK
, is displayed and a high priority tone sounds if the High P
PEAK
alarm remains active for more than 5 seconds, (i.e. the circuit pressure does not return to PEEP + 5 cmH
2
O within 5
seconds). No breaths are delivered during this alarm condition. The Safety and Exhalation valves open allowing the
patient to breathe from room air and the Safety Valve alarm activates. Bias flow is suspended while this alarm is active.
PEEP may not be maintained. This alarm remains active (flashing) until the condition causing it has been resolved.
Low PEEP
This is a high priority audible/visual alarm. LOW PEEP is displayed and a high priority tone sounds if the baseline
pressure (PEEP) is less than the Low PEEP alarm threshold for a period greater than 0.25 ± 0.05 seconds.
Range: 0 to 60 cmH
2
O
Defaults: 3 cmH
2
O (Adult/Pediatric)
1 cmH
2
O (Neonate)
The alarm is off if set to zero.
Circuit Occlusion Alarm
This is a high priority audible/visual alarm. CIRCUIT OCCLUSION is displayed and a high priority tone sounds whenever
the inspiratory or expiratory limb of the patient circuit becomes sufficiently occluded to trigger the alarm. An inspiratory
limb occlusion is unlikely to cause any pressure increase at the patient and will simply result in the termination of the
breath.
The system is designed to prevent an expiratory limb occlusion from causing an increase in patient pressure measured
at the distal end of the ET tube beyond the following limits:
• For Neonates: 5 cmH
2
O or 15% (whichever is greater) above the target pressure
• For Adults/Pediatrics: 10 cmH
2
O or 15% (whichever is greater) above the target pressure
Bias flow is suspended while the alarm is active, and the alarm is deactivated when the occlusion is removed.
Note:
High patient-circuit resistance may cause false circuit-occlusion alarms. False circuit-occlusion alarms may also occur
when peak inspiratory flow exceeds 150 L/min for adult, 75 L/min for pediatrics, and 30 L/min for neonates. For the
recommended test for neonatal-circuit resistance, refer to “Appendix E: Sensor Specifications & Circuit Resistance” on
page 217.
The alarm is not active in nCPAP mode.
Note
:
The ventilator may assert a circuit occlusion alarm in conditions when measured PEEP is significantly greater than
operator set PEEP.
To Next Page
Loading...
