Dräger Savina

Description
98
Description
Ventilation modes
Volume-controlled ventilation
IPPV
Volume-constant mandatory ventilation stroke
The ventilation pattern is specified by the settings for tidal
volume VT, frequency f, inspiration time Tinsp, PEEP, and
FlowAcc.
At the end of the flow phase, the expiration valve remains
closed until the end of the inspiration time Tinsp. This phase,
the inspiratory pause, can be identified as the plateau Pplat
in the curve Paw (t). The values for plateau pressure Pplat and
plateau time Tplat are shown on Values screens 1/2 and 2/2.
When the plateau is turned off Savina immediately changes to
expiration as soon as the set tidal volume VT is applied. In this
case the inspiration time is not adjustable, but it is the result of
the compliance and resistance of the patient’s lungs together
with the set values tidal volume VT and flow acceleration. The
value for Tinsp is shown on Values screen 2/2. Savina
establishes a minimum expiration time of 500 ms and limits the
resulting I:E ratio to max. 4:1.
Flow Acceleration
With the parameter »FlowAcc« the pressure and flow increase
can be influenced. A greater Flow acceleration produces a
steeper pressure and flow increase. Flow acceleration (and
the inspiration time) can be used to adapt the pressure and
flow curve to suit the individual patient’s needs.
Pressure limiting
Pressure Limited Ventilation (PLV)
Savina can limit the peak pressure in IPPV, IPPV
Assist and
SIMV and SIMV/ASB modes. The »Pinsp« ventilation
parameter is used to set the limit.
The value of Pinsp remains effective until Savina has applied
the set tidal volume V
T or until the inspiration time has elapsed.
If the set tidal volume V
T cannot be delivered with the set
values, a »! Tidal volume low« alarm will be displayed.
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Paw
Flow
T
insp
Tinsp
Te
T=
P
plat
Tplat
1
f
t
t
PEEP
without plateauwith plateau
FlowAcc FlowAcc
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Paw
T
insp Te
Pinsp
t