Breathing Circuit Alarms; High Leak; Nv Mask/Rebreathing; Flow Sensor Not Calibrated - ResMed Astral Series Clinical Manual

Alarm Activates when
Low PEEP Monitored PEEP is less than or equal to 2 cmH
PEEP ventilation setting for 10 consecutive breaths.
High PEEP Monitored PEEP is greater than 2 cmH
setting for 10 consecutive breaths.

Breathing circuit alarms

Breathing circuit alarms detect adverse conditions in the breathing circuit or circuit configuration.
Breathing circuit alarms may activate under conditions of:
•

High leak

•

NV mask/Rebreathing

•

Flow sensor not calibrated

•
Circuit incorrectly configured
• Circuit disconnection.
High leak
Alarm Activates when
High Leak The difference between MVe and MVi is greater than the
Leak alarm setting for a 10 second period.
(double limb)
High Leak
Estimated unintentional leak is greater than the Leak alarm
(single limb with setting for a 20 second period.
intentional leak)
NV Mask/Rebreathing
Alarm Activates when
NV mask/Rebreathing A non-vented mask is used in a vented circuit.
An obstruction of the vents in a vented circuit leading to
rebreathing.
Rebreathing on a vented circuit using a non-vented mask or
on a mouthpiece circuit during continuous exhalation into
the circuit.
Rebreathing is greater than 20% for vented circuit or 50%
for mouthpiece circuit, for 10 consecutive breaths.
Flow sensor not calibrated
Alarm Activates when
Flow sensor not The expiratory flow sensor is not calibrated. A Learn Circuit
calibrated should be performed.
(double limb)
Alarm settings and conditions
Alarm setting
O below the Low PEEP
2
Off / On [On]
O above the PEEP N/A
2
Alarm setting
Off, 20 to 80 [Off] (%)
5 to 80, Off [40] (L/min)
Alarm setting
Off / On [On]
Note: Non-selectable in Mouthpiece
mode.
Alarm setting
N/A
English 117