Setting up RH C.O. Measurements

13 Monitoring Cardiac Output

Measuring C.O. Using the Right Heart Thermodilution Method

In the right heart thermodilution method, a fluid of known volume and temperature is injected into the right atrium through the proximal port of a pulmonary artery (PA) (Swan-Ganz) catheter. The injectate bolus mixes with the blood in the right ventricle and the change in blood temperature is measured with a thermistor at the distal end of the catheter in the pulmonary artery.

1Set up the PA line using a PA catheter.

2Attach the injectate temperature probe housing to the PA line.

3Plug the C.O. interface cable into the C.O. module or measurement server extension and connect the following devices into the C.O. interface cable:

–injectate temperature probe

–remote start switch (if used).

Follow your hospital standards to avoid unintentional extraction of the C.O. catheter. Secure the cable using the mounting clip shipped with each C.O. interface cable. You may also find it helpful to loop the C.O. interface cable, tape the loop, and attach it to the undersheet of the patient's bed using a safety pin.

4Plug the thermistor connection cable of the PA catheter into the thermistor connector.

5Connect the injectate temperature probe to the injectate temperature probe housing.

6Check that the correct measurement method is selected.

C.O. Module

C.O. Interface Cable

		Remote Start Switch
		Thermistor
		Connector
	Injectate	Thermistor
	Temperature	Thermistor
	Temperature	Connection
	Probe	Connection
	Probe	Cable
		Cable

Injectate

Syringe

Injectate

Temperature

Probe Housing

PA Catheter

If a catheter is already connected to the Cardiac Output Interface Cable, the monitor automatically recognizes the method used. If not, in the Setup C.O. menu, select Method and then select Right Heart.

Ice-Bath Setup for RH Thermodilution C.O. Measurements

If you are using the flow-through method illustrated above, the injectate temperature is measured at the time of injection by the temperature probe in the injectate temperature probe housing.

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Philips MP40/50, MP60/70/80/90, MP20/30 Measuring C.O. Using the Right Heart Thermodilution Method

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Measuring C.O. Using the Right Heart Thermodilution Method