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20.2 Ventilation Related Problems
Warning: In all alarm conditions check the patient first.
Symptom Possible Cause Remedy
Tidal volume
maintained despite
low PIP.
Flow sensor incorrectly
calibrated.
Calibrate flow sensor.
Blocked Fresh Gas
alarm.
Alarm Message:
Blocked Fresh
Gas.
Fresh gas supply tube blocked
or kinked.
Check the fresh gas supply line
and rest of the patient circuit.
Leaking Fresh Gas
alarm.
Alarm Message:
Leaking Fresh
Gas.
Patient circuit leaking fresh gas. Check the fresh gas supply line
and rest of the patient circuit
plus water trap.
Continuing positive
pressure alarm.
Alarm Message:
Continuing
positive pressure.
Constriction of proximal airway
line.
Remove constriction.
High pressure
alarm.
Alarm Message:
High Pressure.
Waveform has crossed high
pressure alarm threshold.
Check ventilator pressures.
Check the patient circuit.
Adjust alarm threshold.
Failure to cycle
alarm. (No flow
sensor fitted)
Alarm Message:
Cycle Fail.
Waveform has crossed cycle fail
alarm threshold.
Check ventilator pressures.
Check the patient circuit and
water trap.
Adjust alarm threshold
Low pressure alarm.
Alarm Message:
Low Pressure.
Waveform has crossed low
pressure alarm threshold.
Check ventilator pressures.
Check the patient circuit and
water trap.
Adjust alarm threshold.
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