Alarm Settings And Conditions; Tidal Volume Alarms; Minute Volume Alarms - ResMed Astral Series Clinical Manual

Alarm settings and conditions

Alarm settings and conditions
This section details the alarms and their activation conditions. If the alarm has adjustable settings these
are described. Unless otherwise noted, alarms are applicable to all modes. Values provided within
[square brackets] are the default settings.
As soon as the activation condition is met, the Astral device provides both audible and visual alerts
without delay.

Tidal volume alarms

Tidal volume alarms activate when the monitored tidal volume parameter (Vti or Vte) exceeds the Vt
alarm setting.
Tidal volume alarms may be used to detect:
•
change in patient lung condition
•
leak or obstruction in patient circuit or valve.
Alarm Activates when
Inspiratory tidal volume is less than Low Vt for the duration
Low Vti
of three breaths at the current average respiratory rate.
Inspiratory tidal volume is greater than High Vt for three
High Vti
consecutive breaths.
Expiratory tidal volume is less than Low Vt for the duration
Low Vte
of three breaths at the current average respiratory rate.
Expiratory tidal volume is greater than High Vt for three
High Vte
consecutive breaths
WARNING
The measurement of tidal volumes may be affected by leak.

Minute volume alarms

Minute volume alarms activate when the monitored minute volume parameter (MVi or MVe) exceeds the
MV alarm setting (no delay).
Minute volume alarms will not activate during the first 60 seconds of ventilation.
Minute volume alarms may be used to detect:
•
change in patient lung condition
•
leak or obstruction in patient circuit or valve.
Alarm message Activates when
Inspiratory minute ventilation is less than Low MV
Low MVi
Inspiratory minute ventilation is greater than High MV
High MVi
Expiratory minute ventilation is less than Low MV
Low MVe
Expiratory minute ventilation is greater than High MV
High MVe
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Alarm setting (mL)
Adult: Off, 50 to 2990 [100]
Paed: Off, 10 to 995 [25]
Adult: Off, 60 to 3000 [2500]
Paed: Off, 25 to 1000 [500]
Adult: Off, 50 to 2990 [100]
Paed: Off, 10 to 995 [25]
Adult: Off, 60 to 3000 [2500]
Paed: Off, 25 to 1000 [500]
Alarm setting (L)
Adult: Off, 0.5 to 59.9 [3]
Paed: Off, 0.2 to 59.9 [0.5]
Adult: Off, 0.6 to 60 [20]
Paed: Off, 0.3 to 60 [10]
Adult: Off, 0.5 to 59.9 [3]
Paed: Off, 0.2 to 59.9 [0.5]
Adult: Off, 0.6 to 60 [20]
Paed: Off, 0.3 to 60 [10]