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Crossing the 20mbar ventilator set threshold
If the high or low alarm threshold is exceeded by more than 20mbar the ventilator
drops all the gas supplies for 6 seconds. It does not maintain the mean pressure
and stops ventilating and this is true for all modes of ventilation. The ventilator will
re-instate the fresh gas supply after 6 seconds and then restart ventilation a
further 2 seconds after re-instatement of the fresh gas. The high or low pressure
alarm will sound until the condition is cleared. If the ventilator encounters the
same conditions after restarting ventilation the fresh gas pressure relief cycle is
repeated.
Warning: If the user encounters a high or low alarm condition where there is
a pressure spike 20mbar or greater and no gas flow present, this is
indicative of a pneumatic unit component failure.
If the user deems this to be the case the following actions must be followed:
a) Check the alarm thresholds are set correctly.
b) Press the reset button to restart ventilation.
If the pressure spike is generated the ventilator will cut all gases again.
c) Remove the patient immediately to an alternative form of ventilation
d) Remove the ventilator from service.
14.2.2 Minute Volume Alarm Threshold
The default setting for the High Minute volume alarm threshold is 18000 ml.
14.2.3 Cycle Fail Alarm Threshold
The cycle fail alarm threshold becomes active in the following modes when the
the ventilator is used without a flow sensor: CPAP, CMV, PTV, PSV and SIMV.
The cycle fail alarm threshold autotracks the PIP parameter.
Note: The user must be made aware that the cycle fail alarm will be
triggered when the set PIP value is close to or equal to (0 to 3 mbar) the
PEEP or CPAP value. This applies to using the ventilator with a flow sensor
and without. When the proximal airway line or the ET tube becomes
disconnected, the Cycle Fail alarm can be triggered though no threshold is
present in the pressure waveform window. This is a safety feature.
14.2.4 Sub-ambient Pressure Alarm in Non HFO Modes
The “Sub-ambient Pressure” alarm can be triggered in non HFO modes due to
patient effort when the mean airway pressures are low. The patient effort can
force the proximal pressure below -2 mbar and thus trigger the alarm. The
ventilator will stop ventilating but maintain the mean airway pressure and will
restart ventilation after 8 seconds.
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