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Patient Monitor User Manual Monitoring C.O.
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Chapter 18 Monitoring C.O.
18.1 Overview
The cardiac output (C.O.) measurement invasively measures cardiac output and other
hemodynamic parameters by using the Thermodilution method. The Thermodilution method is to
inject a cold solution into the blood circulation system and measure the temperature changes
caused by the cold solution through the thermistor of the pulmonary artery floating catheter, and
the C.O. value is calculated by using the temperature dilution curve.
As C.O. is a variable value, a series of measurements must be carried out to obtain a reliable and
average C.O. value. Always use the average of multiple measurements for thereapy decisions.
The monitor can save a maximum of 6 measurement results.
18.2 C.O. Safety Information
WARNING
1 Make sure that appurtenance applied is in conformity with relevant Medical Device
Safety Requirements.
2 Appurtenance should be avoided from contact with conductive metal body when
being connected or applied.
3 All invasive procedures involve risks to the patient. Use aseptic technique and follow
catheter manufacturer's instructions.
4 The C.O. measurement results may be incorrect during electrosurgery.
5 C.O. floating catheter shall be removed or reinserted after 3 days.
NOTE:
1 To replace the catheter thermistor, please enter the catheter computation coefficient
into the
Constant
item according to the instruction.
2 Please set injection switch well. The calculation of the cardiac output is based on the
state of the injection switch at the end of the measurement. Therefore, after the
selection of the injection switch is completed, don’t change until the measurement is
completed.
3 Please start C.O. measurement after blood temperature is stable, otherwise the
measurement may fail.
18.3 C.O. Monitoring
Preparing Measurement
1. Plug the C.O. cable into the C.O. socket and turn on the monitor.