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

If the patient breathes during mandatory
inspiration, the inspiratory pressure remains
constant for this breath. Only the inspiratory and the
expiratory flow are adapted to the patient's
demand. The applied tidal volume may differ from
the set tidal volume VT for spontaneous generated
breaths, but on average a constant tidal volume is
maintained.
Oxylog 3000 plus terminates an AutoFlow breath if
the tidal volume delivered to the patient is 30 %
greater than the set tidal volume VT.
Set the MVe high and MVe low alarm limits so that
an alarm is triggered if the flow is too high or too
low.
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
inspiratory pressure is limited by 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
pressure rise time Slope.
Instructions for use Oxylog 3000 plus SW 1.n

Start up behavior of AutoFlow

When activating the AutoFlow function,
Oxylog 3000 plus applies a volume-controlled
breath with 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 with an inspiratory
pressure that corresponds to 75 % of this first
target pressure. Oxylog 3000 plus measures
the applied volume again and determines the
subsequent target pressure to reach the set
volume.
– The next breath is applied with this target
pressure.
The inspiratory pressure of the subsequent breaths
is adjusted until the set tidal volume VT is reached.
In the event of a hose disconnected alarm, this
start-up behavior is repeated.
Description
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