Dräger Evita 4 Instructions For Use Manual page 54

Operation
Setting Ventilation Modes
IPPV can be expanded by the following ventilation
parameters:
Flowtrigger (IPPV Assist) – for synchronisation with
attempted spontaneous breathing by the patient.
By switching on the flow trigger and setting the trigger
level, the mandatory strokes are synchronised with the
patient's spontaneous breathing attempts.
Spontaneous breathing activity by the patient is indicated
by the brief display of a lung symbol instead of the usual
symbol for the patient mode.
Sigh – for prophylactic treatment of atelectasis.
Atelectasis can be prevented by switching on the Sigh
function and setting the sigh in the form of an intermittent
PEEP.
When the Sigh function is activated, the end-expiratory
pressure increases for two ventilation strokes every
3 minutes by the set value of the intermittent PEEP.
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AutoFlow – for automatic regulation of the inspiration
flow.
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With AutoFlow *, the inspiration flow is decelerated and
regulated, so that at the selected tidal volume V
current lung compliance a minimum airway pressure is
reached and pressure peaks are avoided.
Evita 4 delivers additional inspiration flow if and when the
patient breathes in – limited by the alarm limit V
The patient can also breathe out during the inspiratory
plateau phase.
The inspiratory pressure is limited by the Paw > alarm
limit.
Set the alarm limits MV < and MV > in order to
avoid excessive or insufficient flow following rapid
changes in compliance.
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* Please refer to page 160 for a detailed description of AutoFlow
and PLV.
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