Instructions for use Zeus Infinity Empowered SW 2.n 235
Monitoring
Measuring accuracy
Take the following measures to ensure optimal
measuring accuracy:
z Observe the attached instructions provided by
the catheter manufacturer. Filled syringes or the
closed autoinjector should be placed in an ice
bath.
z Check the temperature of the ice bath. It should
be lie between 0 °C and 5 °C. The accuracy of
the measurements increases as injectate tem-
perature gets closer to 0 °C.
z Check the volume of the injectate.
z Check catheter constant.
z If syringes are filled manually, the same volume
should always be used (normally 10 cc for
adults and 5 cc for pediatric patients).
z Administer the injectate quickly at the end of a
respiration cycle.
z If C.O. measurements are performed succes-
sively at different times in the respiration cycle,
then the results may deviate from each other,
particularly in ventilated patients.
z Measured values which deviate from the gen-
eral trend or correspond to a very irregular
curve segment are not considered when deter-
mining the average.
z If an injectate having room temperature is used,
10 cc must be injected. Only deviate from this
volume when there are important clinical rea-
sons.
C.O. screen display
The C.O. parameter box displays:
– C.O. (cardiac output): The saved average value
of the last measuring series (in L/min)
– TBlood (blood temperature)
– Time of the creation of the average value
– CI (Cardiac Index)
Calculation: CI = C.O. / Body surface area
Additionally after touching the Display all button
(prerequisite: Display all button has been config-
ured, see page 332):
– Currently set alarm limits
In automatic measuring mode, you must wait for
the Inject now message for the injection of the in-
jectate. The message appears if the initial temper-
ature of the blood is stable.
Once Zeus IE detects a drop in blood temperature
after injection of the injectate, the C.O. values are
created. If fluctuations in the initial blood tempera-
ture occur, the Inject now message disappears
and Zeus IE interrupts measurement until the initial
temperature is stable again.
The mean value is continuously calculated with
each single measurement which is performed or
discarded.
In the C.O. dialog window, the value appears in the
next available display field and the value in the stor-
age field is updated.
If all free storage fields are allocated, the oldest
C.O. curve is deleted or a storage field must be de-
leted manually:
z Touch the Delete C.O. trial button.
214
4.8
37.1
3.12
43.0
25.0
C.O.
L/min
TBlood
CI
11:26
WARNING
Always ensure before a C.O. measurement
that the settings are appropriate for the cathe-
ters actually used. Otherwise, measurements
may be unreliable, causing a wrong assess-
ment of the patient's status.
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