Dräger Evita 4 Instructions For Use Manual page 72

Operation
Independent Lung Ventilation ILV
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 is increased by the set value of the intermittent
PEEP for 2 ventilation strokes every 3 minutes.
ILV/Master can also be configured with the additional
ventilation parameter Pmax.
To set the »Pmax pressure limit«, please refer to
page 115.
Pressure Limited Ventilation (PLV) – for manually
limiting pressure peaks using the Pmax pressure limit.
The tidal volume remains constant as long as the
pressure curve shows a plateau and the flow curve
shows a brief flow pause between inspiration and
expiration.
To set the »Pmax pressure limit«, please refer to
page 115.
The value of Pmax is displayed as a dashed blue line in
the Paw (t) curve.
The tidal volume is constantly monitored. If the tidal
volume V can no longer be applied, the "Inconstant
T
volume" alarm is automatically triggered.
This visual and audible alarm can be suppressed with the
»Alarm Reset« key until the cause of the alarm is
remedied.
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