Fluke Biomedical ProSim 6 - Manual (Page 50)

ProSim 6/8
Users Manual
38
How to Simulate Cardiac Output
The Cardiac Output function electronically simulates the dynamic temperature changes in
the blood of the patient during a thermal dilution cardiac output measurement.
Thermal dilution cardiac output measurements are given by the heat interchange between
the blood of the patient and a known volume of chilled saline put into the heart. Cardiac
output is expressed in liters per minute (L/min) and ranges between 3 L/min and 7 L/min
in normal adults.
Current cardiac output measurement devices can make sure you get the most accurate
measurements. This includes an average of a series of measurements to prevent variations
because of artifacts. This rejects measurements because of clinician technique or the
underlying cardiovascular disease in a patient.
Note
Cardiac output measurement devices that use different techniques (such as
Fick dye injection, Doppler ultrasonography and bioimpedance) are not
addressed or intended for this Product.
To simulate cardiac output, a CI-3 module/jack is necessary and connects to the cardiac
output jack of the Product. This module has connections for the cardiac output
measurement under test and simulates the injectate temperature (IT) thermistors at 0 ° C
or 24 ° C. Of the two connectors on the CI-3 module/cable, the smaller 3-pin connector is
for catheter blood temperature (BT) and is standard on most monitors.
Note
This 3-pin catheter BT connector is compatible with the standard Baxter
(Edwards) BT catheter and equivalent catheters available from other
manufacturers such as Viggo-SpectraMed and Abbott (Sorenson).
The larger 4-pin connector supplies the simulated injectate temperature. The 10-turn
100 k Ω potentiometer enables adjustment of the injectate temperature to 0 or 24 ° C.
Although this 100 k Ω range of resistance has proven adequate to simulate the 0 or 24 ° C
temperature for most brands of cardiac output measurement devices, the 4-pin IT
thermistors connector is not standard on all monitors. A general function connector that
you can connect to the device under test (DUT) injectate cable is also supplied.
Figure 28 shows the general-purpose connector assembly. Note that the injectate
temperature thermistor has to be cut off the EUT cable to install the general-purpose
connector.
Note
A DUT cardiac output cable changed for this test must not be used in a
clinical application.
If the DUT cardiac output cable includes an interconnection (or plug-in) for the injectate
temperature bath probe assembly, change the plug-in cable only.