ResMed Astral Series Clinical Manual page 116

Detecting circuit disconnection and de-cannulation
The most difficult disconnection to detect is a patient interface (eg, cannula, mask or
mouthpiece) being disconnected from the patient.
To test that alarms activate in the case of circuit disconnection:
1. With the breathing circuit configuration in place, start ventilating the patient then wait for a
few cycles for ventilation to stabilise.
2. Disconnect the circuit at the patient interface then check that the alarm(s) configured to
detect circuit disconnection activate.
3. Reconnect the circuit and check that the alarm(s) clear automatically.
4. Repeat steps 2 and 3, disconnecting the circuit at the device and / or at different connection
points of concern.
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