Simulate Cardiac Output - Fluke Biomedical ProSim 8 User Manual

ProSim 8
Users Manual

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.
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.
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 kΩ potentiometer enables adjustment of the injectate temperature to
0 °C or 24 °C.
Although this 100 kΩ range of resistance has proven adequate to simulate the
0 °C 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 26 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.
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.
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