Start Up Behavior Of Autoflow - Dräger Oxylog 3000 plus Instructions For Use Manual

Set the alarm limits MVe high and MVe low appro-
priately, to be advised in the event of excessive or
insufficient flow delivery indicating potential
changes in lung characteristics.
During AutoFlow the flow curve in the curve window
supplies additional information: If the set inspiratory
time Ti is shorter than the lung filling time the flow
curve will display that inspiratory flow has not
returned to baseline at the end of the inspiratory
phase. In this case evaluate the condition of the
patient to determine the cause of the extended
inspiratory time Ti in order to further reduce the
peak pressure. This effect can also be due to a
build-up of secretions. In this situation, the inspira-
tory pressure is limited by the Oxylog 3000 plus as
described above. If, as a result, the set tidal volume
VT can no longer be completely delivered, the
alarm VT low, pressure limit is generated.
The inspiratory flow rise from the PEEP level to the
inspiratory level can be even more closely adapted
to the needs of the patient by means of the pres-
sure rise time Slope.
Instructions for Use Oxylog 3000 plus SW 1.n

Start up behavior of AutoFlow

When activating the AutoFlow function, the
Oxylog 3000 plus delivers a volume-controlled
breath using a constant inspiratory flow rate for the
duration of the inspiratory time Ti. The peak airway
pressure generated from this breath will determine
the inspiratory pressure for the AutoFlow function.
If no suitable pressure can be determined for this
breath or the volume cannot be applied, the
following occurs:
– A pressure controlled breath is applied with an
inspiratory pressure of 5 mbar above the set
PEEP. The applied volume is measured and
determines an initial target pressure to achieve
the set tidal volume VT.
– The next breath is applied using an inspiratory
pressure that corresponds to 75 % of this target
tidal volume pressure. The Oxylog 3000 plus
measures the applied volume again and deter-
mines the subsequent target pressure to reach
the set volume.
– The next breath is applied with this target pres-
sure.
The inspiratory pressure of the subsequent breaths
is adjusted until the set tidal volume VT is reached.
In case of disconnect alarm, this start up behavior
is repeated.
Principles of Operation
163