Autoflow® (Optional) - Dräger Savina Instructions For Use Manual

Description
AutoFlow® (optional)
The AutoFlow function can be activated in the »Settings«
menu.
With AutoFlow, the inspiration flow is automatically adjusted to
changes in lung conditions (C, R) and to the spontaneous
breathing demand of the patient.
Always set the alarm limit »Paw
order to set off an alarm in the event of an increase in
airway pressure or tidal volume V
compliance.
Typically, the selected inspiration time Tinsp is noticeably
longer than the filling time of the lungs. The inspiration
pressure Pinsp corresponds to the minimum value resulting
from both tidal volume V and compliance C of the lungs.
T
Savina automatically controls the inspiration flow so that there
is no pressure peak caused by the resistances of the tube and
the airways. The plateau pressure Pplat varies with changes in
compliance C, as is normal in all constant-volume ventilation
strokes. With AutoFlow, these variations occur in maximum
steps of 3 mbar between ventilation strokes. The plateau
pressure Pplat is automatically limited by the pressure
W
limitation Pmax = Paw –5 mbar.
If the tidal volume V is reached (inspiration flow = 0) before
T
the inspiration time has elapsed, the patient can breathe in and
out during the remaining inspiration time at the level of the
plateau pressure Pplat.
If the patient breathes in or out during mandatory inspiration,
the plateau pressure Pplat is not changed for this ventilation
stroke. Only the inspiration and expiration flow are adapted to
the patient's demand. The individually applied tidal volume V
may differ from the set tidal volume V
strokes, but on average over time a constant tidal volume V
supplied.
The exceeding increase of the tidal volume V
restricted by the alarm limit »VTi
exceeded one time, Savina sets of an advisory message (!);
if the alarm limit is exceeded three times, Savina sets of a
warning message (!!!). The volume is actively limited to the
W
alarm limit value »VTi « by switching over to the PEEP level.
A set inspiration time Tinsp which is shorter than the filling
time of the lungs can be recognized from the flow curve: the
flow at the end of the inspiration time has not yet returned to
zero. The »! Tidal volume low« or »!! Tidal volume low« alarms
indicate that the settings selected do not permit full delivery of
the tidal volume V . It must now be decided whether the
T
current condition of the patient permits prolongation of the
inspiration time Tinsp or an increase of the flow acceleration,
in order to apply the set tidal volume V
100
W W
« as well as V in
T
with change of
T
in specific ventilation
T
T
can be
T
W
«. If the set alarm limit is
.
T
Paw
FlowAcc
high
FlowAcc
PEEP
T
insp
Flow
V
T
without spontaneous breathing
T
is
Paw
PEEP
T
insp
Flow
V
T
without spontaneous breathing
FlowAcc
low
FlowAcc
P
PLAT
T
e
1
f
with spontaneous breathing
P
PLAT
T
e
1
f
with spontaneous breathing
Paw >
Pmax
t
t
Paw >
t
t