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Description
Description
Ventilation modes
Volume-controlled ventilation
IPPV
Volume-constant mandatory ventilation stroke
Paw
The ventilation pattern is specified by the settings for tidal
with plateau
without plateau
volume V
, frequency f, inspiration time T
, PEEP, and
T
T
insp
plat
FlowAcc.
FlowAcc
FlowAcc
P
plat
PEEP
At the end of the flow phase, the expiration valve remains
closed until the end of the inspiration time T
. This phase,
insp
the inspiratory pause, can be identified as the plateau P
plat
t
in the curve Paw (t). The values for plateau pressure Pplat and
T
insp
T
T
insp
e
plateau time Tplat are shown on Values screens 1/2 and 2/2.
1
T=
When the plateau is turned off Savina immediately changes to
f
expiration as soon as the set tidal volume V
is applied. In this
T
Flow
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 V
and flow acceleration. The
T
t
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)
Paw
Savina can limit the peak pressure in IPPV, IPPV
and
Assist
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
P
insp
the set tidal volume V
or until the inspiration time has elapsed.
T
If the set tidal volume V
cannot be delivered with the set
T
values, a »! Tidal volume low« alarm will be displayed.
t
T
T
insp
e
98
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