Testing the alarms
English 113
Testing the oxygen alarms
To perform these tests an oxygen sensor must be fitted. Tests are performed without supplementary
oxygen. Run a Learn Circuit prior to testing.
Alarm Event
Test procedure
Low FiO
2
Start ventilation. Set the alarm limit to 24%.
High FiO
2
Start ventilation. Set the alarm limit to 19%.
Testing the breathing circuit alarms
All breathing circuit alarm tests are conducted in (S)T mode using default settings and a single limb circuit
with intentional leak.
Alarm
Test procedure
Disconnection
Refer to Testing the disconnection alarms (see page 113).
High leak
Leave the circuit open and start ventilation.
NV mask/Rebreathing
Block the circuit (no mask attached) and start ventilation.
For Mouthpiece circuit only: Attach circuit to test lung via 22mm to 10mm
adapter for testing.
Testing the disconnection alarm
Testing of the disconnection alarm should be conducted using a representative breathing circuit
configuration, oxygen flow into the circuit (if any), and the final ventilation settings.
The circuit used to test the alarm should include the patient interface (eg, tracheostomy tube /
endotracheal tube / mask / mouthpiece) to simulate the patient interface being accidentally detached
from the patient. This is a more challenging disconnection for a ventilator to detect than disconnections
elsewhere along the circuit.
For invasive interfaces, consider testing with a tracheal tube one size smaller than the patient’s tube.
This checks that disconnection may still be detected even if the circuit resistance increases somewhat,
such as due to secretions within the cannula.
Alarm
Test procedure
Disconnection
1.
Ensure patient type and interface type have been correctly configured.
2.
Start ventilation and wait a few cycles for ventilation to stabilise.
3.
Disconnect the entire circuit (including patient interface, ie, mask, tracheal
tube, mouthpiece) then check that the alarm(s) configured to detect circuit
disconnection activate.
4.
If the disconnection alarm does not sound, the alarm parameters may need
adjusting. Refer to Adjusting the disconnection alarm (see page 122).
Summary of Contents for Astral 100
Page 1: ...Clinical guide English ...
