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Pull the test lung to mimic a breath, then acknowledge and reset the alarm.
Verify that:
after 10 seconds that the ventilator
delivers a backup breath and the
visual and audible Apnoea alarm is
triggered.
Note: Functional testing with a flow sensor, but with the patient circuit
occluded, the Breath Not Detected alarm will be triggered on the second
mechanical breath. This is because the ventilator registers the second
mechanical breath via the flow sensor as an incomplete patient breath.
When functional testing without the flow sensor, only the Apnoea alarm can
be triggered as there is no Breath Not Detected alarm in this mode of
operation.
Step 14 Set the Backup Breaths button to Off.
Step 15 Gently constrict the proximal airway tube so as to increase the pressure. Allow
the pressure to increase but do not allow it to exceed the high alarm threshold.
(This can be achieved by releasing the constriction of the proximal airway tube by
a small amount.)
Do not reset any Apnoea alarms that may be generated.
Verify that:
after 10 seconds the continuing
positive pressure alarm is triggered
and that the fresh gas supply is cut off.
When the gas supply is cut off release
the constriction from the proximal
airway tube.
After 6 seconds the fresh gas supply should be re-instated.
Step 16 Press the reset button in the alarm panel to clear all alarm notifications.
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