S12 Vet Monitor User’s Manual
14-1
Chapter 14
Cardiac output (C.O.)
14.1.
Introduction
C.O. (cardiac output) measurements were performed using right atrial thermodilution
to measure cardiac output and other hemodynamic parameters. The method is injecting a
cold solution into the blood circulation system and measure the blood temperature drop
caused by the cold solution at a location downstream. In the C.O. measurement window,
the temperature change is shown as a curve. The area under the curve is inversely
proportional to the C.O. value, and the monitor calculates the C.O. value based on the
curve. Since cardiac output is a continuously varying amount, multiple measurements
must be taken to obtain a reliable C.O. average. The monitor can retain 5 results, and user
can select the desired measurement to perform the average calculation.
14.2.
Safety Information
WARNING:
C.O. measurements may be inaccurate when electrosurgical is performed.
All invasive measurements bring about risks for the patient. Sterile techniques
should be used in the measurements and follow manufacturer's instructions.
Please use the accessories specified in this manual. When using, avoid contact
with the conductive metal body.
14.3.
C.O. Measurement Limitation
Factors which can affect the accuracy of C.O. measurement, as following:
Injection temperature
Volume of injection
Baseline of blood temperature of paralyzed patients
Inhalation/exhalation cycle
The proximity of the floating catheter to the lungs
Floating catheter itself
