Dräger Infinity Acute Care System M540 User Manual

Cardiac output
220 Instructions for use Infinity Acute Care System – Infinity M540 SW VG4.n
Overview of cardiac output monitoring
The M540 uses the thermodilution method to com-
pute cardiac output for adult and pediatric patients.
Cardiac output monitoring is not intended for neo-
natal patients.
The MPod – QuadHemo, the Hemo4 and Hemo2
pods connect to the M540 and acquire the blood,
and the injectate temperatures which are used to
compute the cardiac output value.
Although the M540 processes the cardiac output al-
gorithms, you can only view the data and execute
cardiac output functions on the Cockpit when the
M540 is docked in an IACS configuration. For more
information, refer to the instructions for use Infinity
Acute Care System – Monitoring Applications.
Cardiac output measurement method
A solution of known temperature and volume is in-
jected into the blood stream in the right atrium. A
thermistor in the catheter tip continuously mea-
sures the temperature of the blood as it leaves the
heart. The injectate mixes with and cools the sur-
rounding blood. The blood reaches its minimum
temperature relatively quickly and then warms up
slowly until it returns to the baseline blood temper-
ature. The total drop in blood temperature is in-
versely related to the cardiac output of the patient.
The lower the cardiac output value, the more the in-
jectate cools the blood.
When computing cardiac output, the M540 takes
the following factors into account:
– Injectate volume, temperature, density, and
specific heat of the fluid that is being injected
– Baseline blood temperature, density, and spe-
cific heat
– Temperature changes of the blood injectate
mixture
– Area under the temperature curve
Before performing any monitoring functions, refer
to the section "For your safety and that of your pa-
tients" on page 5.
Parameter-specific error messages are listed on
page 282.
Supported parameters
The following parameters are available on the
Cockpit when the M540 is docked:
– Cardiac output
– Blood temperature
– Injectate temperature
Cardiac output precautions
WARNING
An incorrect computation constant may yield
incorrect cardiac output measurements and
put the patient at risk. Confirm that the manu-
ally entered computation constant is correct
for the catheter you are using.

Dräger Infinity Acute Care System M540 Specifications

General

Brand	Dräger
Model	Infinity Acute Care System M540
Category	Medical Equipment
Language	English