Dräger Savina, Instructions For Use Manual

Page: 99 / 132

Description
99
IPPV
Assist
Assisted ventilation with continuous positive airway pressure.
The mandatory ventilation stroke begins when the patient
reaches an inspiratory flow corresponding at least to the flow
trigger set.
The current ventilation frequency may be greater than the
set frequency for the same trigger.
Sigh (intermittent PEEP)
"Sigh", in the form of intermittent PEEP, is operative in IPPV
and IPPV
Assist
modes.
The purpose of the expiratory sigh during ventilation is to open
collapsed areas of the lung, or to keep open "slow" areas of
the lung.
Since atelectatic alveoli have a longer time constant – also
caused by obstructed bronchioles – increased airway
pressure maintained over a longer period is required to
open them.
In many cases, the sigh function is achieved by increasing
the ventilation stroke; however, due to the short time available,
this form of sigh only marginally improves the filling of the
"slow" alveoli.
In Savina, the sigh operates during expiration with an
intermittent PEEP. It is set relative to PEEP (
∆
sigh).
The average airway pressure is higher, and a longer filling
time is normally available.
When the sigh is activated, the end-expiratory pressure
increases every 3 minutes by the intermittent PEEP set
for 2 ventilation strokes.
038 3
7
388
Paw
Sigh phase
interm.
PEEP
PEEP
t