Monitoring
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Instructions for use Zeus Infinity Empowered SW 2.n
Settings on Zeus IE
z Touch the Temp tab (A).
The page displays the selection of the measuring
positions for two temperature sensors:
B T1 meas. site: Bladder, Rectal, Esoph., Na-
sal, Axil., Skin, Other
C T2 meas. site: Bladder, Rectal, Esoph., Na-
sal, Axil., Skin, Other
D The button opens the Alarms > Alarm lim-
its > Noninvasive dialog window for alarm limit
setting.
Cardiac output (C.O.)
Overview
The measurement of cardiac output is based on the
thermodilution method. A solution whose quantity
and temperature are known is injected in the right
atrium into the blood circulation. The solution mixes
with the blood and cools the blood down. Blood
temperature reaches a low point and then in-
creases again slowly up to the initial temperature.
The cooling down of the blood is inversely propor-
tional to the blood output of the heart: the lower the
output, the more the injectate cools down the blood
temperature. A thermistor in the C.O. catheter tip
measures the blood temperature after the blood
leaves the heart.
If the C.O. Start button is pressed on the Hemo-
Pod after changing patient data or switching to sys-
tem standby, the C.O. dialog window opens to
check the settings.
Starting the measurement:
z Touch the Manual start button.
Blood output is measured in liters per minute.
Zeus IE takes the following factors into account for
the C.O. measurement:
– Volume, temperature, density and specific heat
of the injectate
– Initial temperature, density and specific heat of
the blood
– Temperature changes in the blood/injectate
mixture
– Area underneath the temperature curve
397
Sensors/Parameters
A
B
C
D
CAUTION
Only for adults and pediatric patients at least
1 year of age! Measurements on younger patients
lead to inaccurate results.
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