Autoflow Start Behavior - Dräger Zeus Infinity Empowered Instructions For Use Manual

Description
patient. The inspiration pressure does not change
with spontaneous breathing in the current ventila-
tion breath. The result of tidal volume determination
is, however, taken into account in the following
breath.
Due to the spontaneous breathing efforts of the pa-
tient or compliance modifications of the lung, the
tidal volume in the individual ventilation breaths can
deviate from the adjusted tidal volume VT. How-
ever, in an average time, a tidal volume is applied
which corresponds to the set volume VT.

AutoFlow start behavior

When starting an AutoFlow ventilation mode
(Sync., Sync./Pressure Support and Volume Con-
trol), a series of test breaths is first required to as-
sess the lung parameters. These test breaths com-
prise the basis for calculation of the ventilation
pressure.
Algorithm of the AutoFlow function
1. nd start breath
In the first test breath an inspiration pressure of
5 mbar above PEEP is applied. This is the smallest
ventilation pressure which is possible with the Auto-
Flow ventilation. After this test breath a new target
pressure is achieved with the help of the measured
tidal volume.
2. nd start breath
In the second test breath the ventilation pressure is
adjusted to 75 % of the calculated target pressure;
however, it has a maximum of only up to 15 mbar
above PEEP.
From the 3rd breath
From the third inspiration breath after the start of
the AutoFlow ventilation, the ventilation pressure is
adjusted to the calculated target pressure. Each
further breath readjustment of the inspiratory pres-
sure is limited to ±3 mbar.
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Disconnection
After disconnection is detected and reconnection
has occurred, AutoFlow starts with the 1st start
breath.
Pressure limitation
The lowest ventilation pressure is 5 mbar or Psupp
above PEEP. It is the higher value which applies.
The maximum ventilation pressure is restricted by
the upper pressure limit P
pressure limitation is set, the required tidal volume
is no longer applied. This is signaled to the user by
a P lim/VT not attained alarm.
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Volume monitoring
During AutoFlow ventilation, automatic volume
monitoring is active. If a tidal volume larger than
130 % of the value set by the user is applied, this
results in abandonment of the inspiration breath.
The ventilation pressure is reduced to 75 % of the
current pressure and the pressure limitations of the
second start breath apply. If this ventilation pres-
sure also results in a volume high alarm at the next
inspiration breath, then the ventilation pressure will
once again be reduced to 75 %.
VT adjustment:
After adjustment of tidal volume by the user, the
breath readjustment of inspiratory pressure is lim-
ited to +3 mbar. The lowering of ventilation pres-
sure in the following inspiration breath after a VT
adjustment is not limited.
Instructions for use Zeus Infinity Empowered SW 2.n
set by the user. If a
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