Dräger Perseus A500 - Page 267

Instructions for use Perseus A500 SW 2.0n 267
Principles of operation
VC - AF
With AutoFlow, the set tidal volume VT is applied
for all mandatory volume-controlled breaths with
the lowest required pressure. The patient can
breathe spontaneously throughout the entire
respiratory cycle, during both inspiration and
expiration. The pressure patterns and flow patterns
of the mechanical inspiratory breaths correspond
to those of pressure-controlled ventilation.
Due to the patient's spontaneous breathing efforts
or compliance changes in the lungs, the tidal
volume in an individual breath may deviate from
the set tidal volume VT. However, averaged over
time a tidal volume corresponding to the set
volume VT is applied.
If no automatic ventilation has previously taken
place, a volume-controlled test breath with
constant inspiratory flow is performed when
starting a ventilation mode with AutoFlow in order
to estimate the lung parameters. The inspiratory
pressure required at the start is determined from
this test breath. Each additional breath-related
readjustment of the inspiratory pressure is limited
to ±3 hPa (cmH
2O). The pressure difference
(inspiratory pressure - PEEP) is at least 5 hPa
(cmH
2O) and the upper inspiratory pressure limit is
set by Pmax. If the set value for VT is reduced, the
inspiratory pressure will be reduced by a greater
amount if necessary.
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Slope
Trigger