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19. Commonly Seen Alarms
19.1 High Pressure
If the PIP is above the user set alarm threshold, this
alarm is generated. If the alarm thresholds are not
set by the user, the ventilator automatically sets the
alarm thresholds 5 mbar above the set PIP in
conventional modes of ventilation. The low pressure
threshold is automatically set at 1mbar on power up
and should not be adjusted to a level below that.
(SLE5000 Only). The alarm thresholds are set 10
mbar above and below peak pressure in HFO. If the
PIP is more than 5 mbar above the alarm limit, the
gasses will be cut and the ventilator will attempt to
restart HFO within 6 seconds.
Action: If the patient condition has remained
unchanged and does not require an increase in
PIP, adjust the high pressure alarm threshold.
19.2 Low Pressure
If the pressure is below the user set alarm
threshold, this alarm is generated. At power up the
low pressure alarm is set to a level of 1 mbar. This
may be increased, but it is advised that this level not
be decreased. Decreasing this level will take the
alarm threshold into the negative and a
disconnection alarm will not be generated for 20
seconds when the “Breath Not Detected” alarm is
recognized.
Action: Check patient condition. Check patient
circuit for any sign of leaks e.g. water trap has
not been correctly closed; temperature probe
may have loosened or disconnected.
19.3 Breath Not Detected
If the ventilator does not see any patient effort within
20 seconds of delivering a mechanical breath a
“Breath Not Detected” alarm is generated. The
ventilator has to see both inspiration and expiration
to recognize a breathe.
Action: Check patient effort. If there is a patient
effort, check the ET tube patency. If the tube is
blocked, only inspiration would be seen. If there
is a large leak, the patient would not be able to
reach the trigger threshold, therefore an
inspiration and expiration would not be detected
and the “Breath Not Detected” alarm will sound.
In patient interactive modes i.e. SIMV,
PSV,PTV,CPAP the breath detection threshold level
might need adjusting to ensure that all patient
efforts are captured.
19.4 Low Tidal Volume
The measured volume is below the selected alarm
threshold. This can happen on switching between
modes. When in triggered modes of ventilation,
every breath may be different and if the tidal volume
alarm threshold if not set at a level to capture all
breaths then this alarm will be generated.
Action: Watch triggered breaths and set tidal
volume alarm level at the appropriate level.
19.5 Unexpected Rise or drop in Mean
P. (SLE5000 only)
In HFO mode MAP alarms are automatically set at 5
mbar above and below the mean pressure level.
This is not a user set alarm and is not shown
anywhere on the screen. When this automatically
set threshold is crossed, the alarm is generated.
Action: Check patient. Check patient circuit and
water trap. If nothing appears to have changed
press “AUTOSET”.
19.6 Unexpected Rise or Drop in Max P.
(SLE5000 only)
In HFO mode the Maximum pressure alarms are
automatically set 5 mbar above and below the
maximum pressure. This is not a user set alarm and
is not shown anywhere on the screen. When the
automatically set threshold is crossed then the
alarm is generated.
Action: Check patient. Check patient circuit and
water trap. If nothing appears to have changed,
then press “AUTOSET”.
19.7 Unexpected Rise or Drop in Min P.
(SLE5000 only)
In HFO mode the Minimum pressure alarms are
automatically set 5 mbar above the and below the
minimum pressure.This is not a user set alarm and
is not shown anywhere on the screen. When the
automatically set threshold is crossed, the alarm is
generated.
Action: Check patient. Check patient circuit and
water trap. If nothing appears to have changed
press “AUTOSET”.
19.8 Continuing Positive Pressure
If alarms are not manually set or adjusted, the
ventilator automatically sets alarm thresholds above
and below the selected ventilation parameters. A
“Continuing Positive Pressure” alarm is generated if
there is an increase of 5 mbar above the selected
PEEP, which lasting longer than 10 seconds.
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